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| d a t a sh eet product speci?cation supersedes data of 1998 mar 24 file under integrated circuits, ic03 2000 may 19 integrated circuits UBA2050(a); uba2051(a;c) one-chip telephone ics with speech, dialler and ringer functions
2000 may 19 2 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) features speech/transmission part low dc line voltage; operates down to 1.45 v (excluding voltage drop over external polarity guard) line voltage regulator with adjustable dc voltage regulated 3.3 v supply (v dd ) for the dialler part and peripherals compatible with: C speech mode C ringer mode C trickle mode. unregulated supply (v cc ) for the transmission part and peripherals transmit stage with: C microphone amplifier with symmetrical high-impedance inputs C dtmf input with confidence tone on receive output. receive stage with: C receive amplifier with asymmetrical output C earpiece amplifier with adjustable gain (and gain boost facility) for all types of earpieces. agc: line loss compensation for microphone and receive amplifiers. dialler part last number redial (lnr) (32 digits) pulse dialling: C 10 pps and 20 pps (resistor option) C m/b 2 : 3 and 1 : 2 (resistor option). dtmf timing: C manual dialling with minimum duration for bursts and pauses (85/85 ms) C calibrated timing during redialling (85/85 ms). pulse or tone mode select at start-up (resistor option) flash function (600, 300, 98 and 80 ms) (resistor options) access pause time 2.0 and 3.6 s (resistor option); access pauses in series are possible [* /t] key (for mixed mode dialling) or separate [p ? t] key repertory memory integrity check keytone generation (only UBA2050, UBA2050a and uba2051c) dial mode output (dmo) function during pulse dialling and flash function (only UBA2050 and uba2051) led output for dtmf dialling indication (only UBA2050a and uba2051a) function keys: C [lnr/p], [r] and [p ? t] C [store], [mem], [m1], [m2] and [m3] (only uba2051, uba2051a and uba2051c). resistor options: C [* /t] key definition (mms) C pulse or tone mode selection (pts) C flash time selection (ftsa and ftsb) C make/break ratio selection (mbs) C pulses per second (pps) C access pause time (apt). 13 repertory numbers (only uba2051, uba2051a and uba2051c): C 3 direct memories (21 digits) C 10 indirect memories (21 digits). supply and temperature independent tone output on-chip dtmf filtering for low output distortion ( cept cs 203 compatible) on-chip oscillator suitable for low-cost 3.579545 mhz quartz crystal or ceramic resonator uses standard single-contact keyboard keyboard entries fully debounced. ringer part ringer input frequency discrimination 3-tone ringer with 4 programmable melodies (selectable via keyboard by keys [1] to [4]) 4-level volume control (selectable via keyboard by keys [5] to [8]). 2000 may 19 3 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) general description the ics UBA2050, UBA2050a, uba2051, uba2051a and uba2051c contain all the functions needed to build a fully electronic telephone set. in many places in the text, figures and tables, the description is not applicable for all the five types, but only for one or two or for a combination. these combinations will be referred to by means of short denotations as given in table 1. table 1 denotations of types the devices incorporate a speech/transmission part, a dialler part and a ringer part. by offering a wide range of possible adaptations for each part, the uba205xx applications can be easily adapted to meet different requirements. speech/transmission part the speech/transmission part performs all transmission and line interface functions required in fully electronic telephone sets. it performs electronic switching between transmission and dialling. the ic operates at a dc voltage down to 1.45 v (with reduced performance) to facilitate the use of telephone sets connected in parallel. when the line current is high enough, a fixed amount of current is derived from pin ln in order to create a supply point at pin v dd . the voltage at pin v dd is regulated at 3.3 v to supply the dialler and ringer parts and peripheral circuits. dialler part the dialler and ringer parts of the ic are responsible for the system control, system settings and the generation and detection of various signals. the dialler offers a 32-digit last number redial function. the uba2051x offers in addition 13 memories (3 direct + 10 indirect) of 21 digits. during pulse dialling the dmo output of the uba205x can be used to decrease the line voltage. during tone dialling the led output of the uba205xa is used to indicate dtmf dialling. a keytone is available if a valid key is pressed for the types UBA2050x and uba2051c. ringer part the ringer part offers a discriminator input which enables the mdy/tone output as soon as a valid ring frequency is detected. it offers a choice of 4 different 3-tone melodies and a 4-level volume control, both programmable via the keyboard. an external very low cost ringer output stage for a buzzer is needed. stabilized supply (v dd ) during ringer mode for dialler and ringer part is included. denotation types UBA2050x UBA2050; UBA2050a uba2051x uba2051; uba2051a; uba2051c uba205x UBA2050; uba2051 uba205xa UBA2050a; uba2051a uba205xx all ?ve types ordering information type number package name description version UBA2050t so28 plastic small outline package; 28 leads; body width 7.5 mm sot136-1 UBA2050at so28 plastic small outline package; 28 leads; body width 7.5 mm sot136-1 uba2051t so28 plastic small outline package; 28 leads; body width 7.5 mm sot136-1 uba2051at so28 plastic small outline package; 28 leads; body width 7.5 mm sot136-1 uba2051ct so28 plastic small outline package; 28 leads; body width 7.5 mm sot136-1 2000 may 19 4 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) quick reference data symbol parameter conditions min. typ. max. unit speech/transmission part i line line current operating range normal operation 11 - 140 ma with reduced performance 1 - 11 ma v ln dc line voltage i line = 15 ma 4.05 4.35 4.65 v i cc internal current consumption v cc = 3.6 v - 1.25 1.5 ma v cc supply voltage for internal circuitry (unregulated) i p =0ma - 3.6 - v v dd regulated supply voltage for peripherals speech mode; i dd = - 2.6 ma 3.0 3.3 3.6 v ringer mode; i dd = 75 ma 3.0 3.3 3.6 v i dd available supply current for peripherals --- 2.6 ma g v(tx) typical voltage gain for microphone ampli?er v mic = 4 mv (rms) 43.2 44.2 45.2 db g v(rx) typical voltage gain for receiving ampli?er v ir = 4 mv (rms) 32.4 33.4 34.4 db d g v(qr) gain setting range for earpiece ampli?er r e1 = 100 k w- 14 - +12 db d g v(trx) gain control range for microphone and receive ampli?ers i line = 85 ma; referenced to i line =15ma - 6.0 - db d g v(trx)(m) gain reduction for microphone and receive ampli?ers in dtmf mode - 80 - db dialler part v hg(ln)(rms) high group frequency voltage (rms value) on line r dtmf1 =20k w ; r dtmf2 = 2.74 k w 353 435 536 mv v lg(ln)(rms) low group frequency voltage (rms value) on line r dtmf1 =20k w ; r dtmf2 = 2.74 k w 277 341 420 mv g v pre-emphasis of group 1.5 2.0 2.5 db thd total harmonic distortion -- 25 - db ringer part f ring ringer detection frequency 13 -- hz 2000 may 19 5 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) this text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the acrobat reader .this text is here in _ white to force landscape pages to be rotated correctly when browsing through the pdf in the acrobat reader.this text is here inthis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the acrobat reader. white to force landscape pages to be ... block diagram u ll pagewidth keyboard detector flash keytone tone generator timing/ control ringer part detector/ generator dtmf/ ringer db mdy mute dtmf indication pulse v cc dialler part speech/transmission part ir dtmf v dd led dmo dp/fl kt mdy/tone uba205xx mic + mic - gnd fca138 ln supply agc slpe slpe xtal ce/csi ce/fdi v cc gar reg rx qr agc r1 r2 r3 r4 c1 c2 c3 c4 earpiece amplifier receive amplifier transmit amplifier v dd regulator fig.1 block diagram. UBA2050 and UBA2050a: c4 output not available. uba2051 and uba2051a: kt output not available. UBA2050 and uba2051: dmo output available, led output not available. UBA2050a and uba2051a: led output available, dmo output not available. uba2051c: kt output available, dmo and led outputs not available. 2000 may 19 6 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) pinning note 1. the cradle switch and the two positions handset on the cradle and handset lifted are further on in this document referred to as hook-switch, respectively on-hook and off-hook position. symbol pin description UBA2050 UBA2050a uba2051 uba2051a uba2051c ln 11111 positive line terminal slpe 22222 slope (dc resistance) adjustment reg 33333 line voltage regulator decoupling ir 44444 receive ampli?er input agc 55555 automatic gain control and line-loss compensation dtmf 66666 dtmf transmit input v dd 77777 stabilized supply for dialler and ringer parts xtal 88888 oscillator input dp/fl 99999 dial pulse/?ash output (active low) dmo 10 - 10 -- dial mode output led - 10 - 10 - dtmf mode indication output ce/csi 11 11 11 11 11 chip enable/cradle switch input; note 1 ce/fdi 12 12 12 12 12 chip enable/frequency discrimination input mdy/tone 13 13 13 13 13 melody (ringer) output/dtmf generator output kt 14 14 -- 10 keytone output c4 -- 14 14 14 keyboard input/output c4 c3 15 15 15 15 15 keyboard input/output c3 c2 16 16 16 16 16 keyboard input/output c2 c1 17 17 17 17 17 keyboard input/output c1 r4 18 18 18 18 18 keyboard input/output r4 r3 19 19 19 19 19 keyboard input/output r3 r2 20 20 20 20 20 keyboard input/output r2 r1 21 21 21 21 21 keyboard input/output r1 gnd 22 22 22 22 22 negative line terminal qr 23 23 23 23 23 earpiece ampli?er output gar 24 24 24 24 24 gain adjustment earpiece ampli?er rx 25 25 25 25 25 receive ampli?er output mic+ 26 26 26 26 26 non-inverting microphone ampli?er input mic - 27 27 27 27 27 inverting microphone ampli?er input v cc 28 28 28 28 28 supply for speech/transmission part and peripherals 2000 may 19 7 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, halfpage ln slpe reg ir agc dtmf v dd xtal dmo ce/csi ce/fdi kt mdy/tone v cc mic - mic + rx qr gnd gar r1 r2 r3 r4 c1 c2 c3 1 2 3 4 5 6 7 8 9 10 11 12 13 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 UBA2050t mgt042 dp/fl fig.2 pin configuration (UBA2050t). handbook, halfpage ln slpe reg ir agc dtmf v dd xtal led ce/csi ce/fdi kt mdy/tone v cc mic - mic + rx qr gnd gar r1 r2 r3 r4 c1 c2 c3 1 2 3 4 5 6 7 8 9 10 11 12 13 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 UBA2050at mgt043 dp/fl fig.3 pin configuration (UBA2050at). handbook, halfpage ln slpe reg ir agc dtmf v dd xtal dmo ce/csi ce/fdi c4 mdy/tone v cc mic - mic + rx qr gnd gar r1 r2 r3 r4 c1 c2 c3 1 2 3 4 5 6 7 8 9 10 11 12 13 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 uba2051t mgt044 dp/fl fig.4 pin configuration (uba2051t). handbook, halfpage ln slpe reg ir agc dtmf v dd xtal led ce/csi ce/fdi c4 mdy/tone v cc mic - mic + rx qr gnd gar r1 r2 r3 r4 c1 c2 c3 1 2 3 4 5 6 7 8 9 10 11 12 13 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 uba2051at mgt045 dp/fl fig.5 pin configuration (uba2051at). 2000 may 19 8 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) functional description the values given in the functional description are typical values unless otherwise specified. for numbering of components, refer to figs 7, 37 and 38. voltage levels are referenced to the negative line terminal gnd, except when otherwise specified. speech/transmission part s upply the supply for the ic and its peripheral circuits is obtained from the telephone line (see fig.7). line interface (pins ln, slpe and reg) the ic generates a stabilized reference voltage v ref between pins ln and slpe. this reference voltage is 4.15 v, is temperature compensated and can be adjusted by means of an external resistor r va . the reference voltage can be increased by connecting the resistor r va between pins reg and slpe or decreased by connecting the resistor r va between pins reg and ln. the voltage at pin reg is used by the internal regulator to generate v ref and is decoupled by capacitor c reg connected between pins reg and gnd. this capacitor, converted into an equivalent inductance (see section set impedance), realizes the set impedance conversion from its dc value (r slpe ) to its ac value (r cc in the audio frequency range). the voltage at pin slpe is proportional to the line current, and the voltage v ln at pin ln can be calculated as follows: v ln =v ref +r slpe i slpe i slpe =i line - i cc - i p - i sup where: i line = line current i cc = internal current consumption i p = supply current for peripheral circuits i sup = current consumed by the v dd regulator from pin ln. resistor r slpe is an external resistor connected between pins slpe and gnd. the preferred value for r slpe is 20 w . changing the value of r slpe will affect more than the dc characteristics: it also influences the microphone and dtmf gains, the gain control characteristics, the sidetone level and the maximum output swing on the line. the dc current flowing into the set is determined by the exchange supply voltage (v exch ), the feeding bridge resistance (r exch ), the dc resistance of the telephone line (r line ) and the reference voltage (v ref ). the excess current is shunted via pin ln to pin slpe when the line current (i line ) is greater than the sum of the supply current of the speech/transmission part (i cc ), the current drawn by the peripheral circuitry connected to v cc (i p ) and the input current of the v dd regulator (i sup ). with line currents below i low (9 ma), the internal reference voltage (generating v ref ) is automatically adjusted to a lower value. this means that more sets can operate in parallel with dc line voltages (excluding the polarity guard) down to an absolute minimum voltage of 1.45 v. at line currents below i low , the circuit has limited sending and receiving levels. this is called the low voltage area. handbook, halfpage ln slpe reg ir agc dtmf v dd xtal kt ce/csi ce/fdi c4 mdy/tone v cc mic - mic + rx qr gnd gar r1 r2 r3 r4 c1 c2 c3 1 2 3 4 5 6 7 8 9 10 11 12 13 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 uba2051ct fca128 dp/fl fig.6 pin configuration (uba2051ct). 2000 may 19 9 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) internal supply (pin v cc ) the internal transmission part circuitry is supplied from v cc . this supply voltage is derived from the voltage on pin ln by means of resistor r cc and must be decoupled by capacitor c vcc connected between pins v cc and gnd. this supply point may also be used to supply peripheral circuits e.g. an electret microphone taking into account the supply possibilities according to fig.8. the voltage v cc (see fig.9) depends on the current consumed by the transmission part and the peripheral circuits: v cc =v cc0 - r cc (i p +i rec ) where: v cc0 =v ln - i cc r cc i rec = the current consumed by the output stage of the earpiece amplifier. handbook, full pagewidth fca129 ringer- interface/ peripherals r line i line r exch v exch i p r cc supply electret microphone 4.7 m f c reg 220 m f c vdd 100 m f c vcc i slpe r slpe 20 w reg from preamp supply transmission part gnd v cc v dd slpe i sup i dd i cc ln v dd regulator dialler/ ringer uba205xx fig.7 supply configuration. 2000 may 19 10 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, halfpage 0 3 2 1 0 12 4 3 mgl827 i p (ma) v cc (v) (2) (1) 1.9 ma 1.6 ma fig.8 typical current i p available from v cc for peripheral circuitry. v cc 3 2.5 v; v ln = 4.35 v at i line = 15 ma; r cc = 619 w ; r slpe =20 w . (1) this curve is valid when the receiving amplifier is not loaded. (2) this curve is valid when the receiving amplifier is loaded; v o(rms) = 150 mv; r l = 150 w . handbook, halfpage fca130 i rec peripheral circuits i p gnd v cc v cc0 r cc fig.9 v cc used as supply voltage for peripheral circuits. regulated supply point (pin v dd ) the v dd regulator delivers a stabilized voltage to supply the internal dialler and ringer parts and peripheral circuits in transmission mode (nominal v ln ) and in ringer mode (v ln = 0 v). the maximum supply current for peripherals is 1.9 ma in dialling mode (dtmf generator on) and 2.6 ma in speech mode (dtmf generator off). the supply conditions in ringer and trickle (on-hook condition) modes must not be disturbed by the peripheral supply currents. the regulator (see fig.7) consists of a sense input circuitry (pin ln), a current switch and a v dd output stabilizer (pin v dd ). v dd is decoupled by capacitor c vdd . the regulator function depends on the transmission, ringer and trickle modes as follows: transmission mode: the regulator operates as a current source at the ln input; it takes a constant current of i sup = 4.5 ma (at nominal conditions) from pin ln. the current switch reduces the distortion on the line at large signal swings. output v dd follows the dc voltage at pin ln (with typically 0.35 v difference) up to v dd = 3.3 v. the input current of the regulator is constant while the output (source) current is determined by the consumption of the peripherals. the difference between input and output current is shunted by the internal v dd stabilizer. ringer mode: the regulator operates as a shunt stabilizer to keep v dd at 3.3 v. the input voltage v ln equals 0 v while the input current into pin v dd is delivered by the ringing signal. trickle mode: when v dd is below typically 2 v, the regulator is inhibited. the current consumption of the v dd regulator in trickle mode is very low to save most of the trickle current for memory retention of the dialler and ringer parts. 2000 may 19 11 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth fca131 i line r line v cc gnd ln v dd c vdd 220 m f uba205xx r cc i cc i dd i ln peripherals sense switch v dd regulator i sup r exch v exch c vcc 100 m f fig.10 v dd regulator configuration. s et impedance in the audio frequency range, the dynamic impedance is mainly determined by resistor r cc . the equivalent impedance of the circuit is illustrated in fig.11. handbook, halfpage ln gnd slpe r slpe 20 w c reg 4.7 m f reg v cc r cc 619 w c vcc 100 m f r p v ref l eq fca132 fig.11 equivalent impedance between ln and gnd. l eq =c reg r slpe r p . internal resistance r p = 17.5 k w . 2000 may 19 12 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) t ransmit stages microphone signal ampli?cation (pins mic+ and mic - ) the uba205xx has symmetrical microphone inputs. the input impedance between pins mic+ and mic - is 64 k w (2 32 k w ). in speech mode, the voltage gain from pins mic+ and mic - to pin ln is set at 44.2 db at 600 w line load. microphone arrangements are illustrated in fig.12. automatic gain control is provided on this amplifier for line loss compensation. handbook, full pagewidth mgt052 gnd v cc (1) mic - mic + mic - mic + mic - mic + (2) fig.12 microphone arrangements. a. magnetic or dynamic microphone. b. electret microphone. c. piezoelectric microphone. (1) this resistor may be connected to reduce the terminating impedance. (2) extra decoupling capacitor for the microphone supply. dtmf ampli?cation (pin dtmf) when the dtmf amplifier is enabled, dialling tones may be sent on the line. these tones are generated at pin mdy/tone and their amplitude can be adjusted by means of an attenuator and filter network (see fig.35) before being applied to the dtmf amplifier at pin dtmf. these tones are also sent to the receive output rx at a low level (confidence tone). the uba205xx has an asymmetrical dtmf input. the input impedance between pins dtmf and gnd is 20 k w . the voltage gain from pin dtmf to pin ln is set at 26 db at 600 w line load. the dc voltage between pins dtmf and gnd is 0 v. so, when an external attenuator/filter network is used, there is no need for a second decoupling capacitor. the automatic gain control has no effect on the dtmf amplifier. r eceive stages the receive part consists of a receive amplifier and an earpiece amplifier. receive ampli?er (pins ir and rx) the receive amplifier transfers the received signal from input ir to output rx. the input impedance between pins ir and gnd is 20 k w . the voltage gain from pin ir to pin rx is fixed at 33.4 db. the rx output is intended to drive high ohmic (real) loads. automatic gain control is provided on the receive amplifier. 2000 may 19 13 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) earpiece ampli?er (pins gar and qr) the earpiece amplifier is an operational amplifier having its output qr and inverting input gar available. it can be used in conjunction with two resistors to get some extra gain or attenuation. arrangements of the receive and earpiece amplifier are illustrated in fig.13. earpiece connections are shown in fig.14. in the basic configuration (see fig.13), output rx drives the earpiece amplifier by means of r e1 connected between pins rx and the inverting input gar. feedback resistor r gar of the earpiece amplifier is connected between pins qr and gar. output qr drives the earpiece via a series capacitor c ear . the gain of the earpiece amplifier (from rx to qr) can be set between +12 and - 14 db by means of resistor r gar . the preferred value of r e1 is 100 k w . the earpiece amplifier offers a gain boost facility relative to the initial gain. resistor r gar has to be replaced by the network of r gar1 ,r gar2 and r gb and a series capacitor c gb as shown in fig.13. the initial gain is defined by: which corresponds to r gb = . the gain boost is realised by a defined value of r gb and is defined by: external capacitors c gar (connected between pins qr and gar) and c gars (connected between pins gar and gnd) ensure stability. the capacitor c gar provides a first-order low-pass filter. the cut-off frequency corresponds to the time constant c gar r gar . the value of c gars must be 10 times the value of c gar to ensure stability. the output voltages of the earpiece amplifier and the dtmf amplifier are specified for continuous wave drive. the maximum output voltage swing depends on the dc line voltage v ln , the dc resistance r cc of the set-impedance network between pins ln and v cc , the current consumption i cc and i p from pin v cc and the load impedance at pin qr. v qr v rx ---------- r gar1 r gar2 + r e1 --------------------------------------- - ? ?? C = v qr v rx ---------- r gar1 r gar2 + r e1 --------------------------------------- - ? ?? 1 r gar1 r gar2 r gar1 r gar2 + ----------------------------------------- - r gb ----------------------------------------- - + ? ? ? ? ?? C = handbook, full pagewidth i line r line v cc gnd 0.5v cc qr ln gar c gar c gar rx fca133 c vcc 100 m f earpiece amplifier uba205xx r cc r gar r e1 i cc r gar1 r e1 r gar2 r gb c gb rx gar qr addition for gain boost of earpiece amplifier c gars r exch v exch c gars c ear earpiece fig.13 receive and earpiece amplifier configuration. 2000 may 19 14 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth (1) (2) qr qr qr mgt051 gnd gnd gnd fig.14 earpiece connections. (1) this resistor may be connected to prevent distortion due to the inductive load. (2) this resistor is required to increase the phase margin due to the capacitive load. a. dynamic earpiece. b. magnetic earpiece. c. piezoelectric earpiece. 2000 may 19 15 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) a utomatic gain control ( pin agc) the uba205xx performs automatic line loss compensation. the automatic gain control varies the gain of the microphone amplifier and the gain of the receive amplifier in accordance with the dc line current. the control range is 6.0 db. this corresponds approximately to the loss for a cable length of 5 km with an 0.5 mm diameter twisted copper-pair, a dc resistance of 176 w /km and an average attenuation of 1.2 db/km). the ic can be used with different configurations of exchange supply voltage and feeding bridge resistance by connecting an external resistor r agc between pins agc and gnd (see fig.15). this resistor enables the i start and i stop line currents to be increased (the ratio between i start and i stop is not affected by the resistor). the agc function is disabled when pin agc is left open-circuit. handbook, full pagewidth mgt049 - 6 - 4 - 2 0 100 80 60 40 20 90 70 50 30 10 0 d g v (db) i line (ma) 0 10 20 30 k w r agc = fig.15 variation of gain as a function of line current with r agc as parameter. 2000 may 19 16 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) s idetone s uppression the anti-sidetone network for the uba205xx, comprising r cc in parallel with z line ,r ast1 ,r ast2 ,r ast3 ,r slpe and z bal (see fig.16), suppresses the transmitted signal in the earpiece. maximum compensation is obtained when the following conditions are fulfilled: r slpe r ast1 =r cc (r ast2 +r ast3 ) z bal =k z line the scale factor k is chosen to meet the compatibility with a standard capacitor from the e6 or e12 range for z bal . in practice, z line varies considerably with the line type and the line length. therefore, the value of z bal should be chosen for an average line length, which gives satisfactory sidetone suppression with short and long lines. the suppression also depends on the accuracy of the match between z bal and the impedance of the average line. the anti-sidetone network for the uba205xx attenuates the received signal from the line by 32 db before it enters the receive stage. the attenuation is almost constant over the whole audio frequency range. a wheatstone bridge configuration (see fig.17) may also be used. more information on the balancing of an anti-sidetone bridge can be obtained in our publication application handbook for wired telecom systems, ic03b . k r ast2 r ast3 r slpe + () r ast1 r slpe ----------------------------------------------------------- = handbook, full pagewidth mgt046 i m z ir ir r ast1 r ast3 r ast2 slpe r slpe gnd z line r cc ln z bal fig.16 equivalent circuit of uba205xx anti-sidetone bridge. 2000 may 19 17 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth mgt047 i m z ir ir r a r ast1 slpe r slpe gnd z line r cc ln z bal fig.17 equivalent circuit of an anti-sidetone network in a wheatstone bridge configuration. dialler and ringer parts s upply voltage ( pin v dd ) the power supply must be maintained for repertory memory retention (standby supply voltage) and may drop down to 1.0 v, being the minimum value of the memory retention voltage v mr . applying a large capacitor across the supply terminals can retain the memory when power connections are broken. the minimum operating voltage is 2.0 v (the power-on reset voltage v por has its maximum value). below this value, the internal power-on reset disables the ic. a memory integrity check is performed at each start-up. in the event of a failing check, the memory is cleared. o scillator ( pin xtal) the uba205xx uses an on-chip oscillator as the master timing source. it needs to be completed by an external 3.579545 mhz quartz crystal or ceramic resonator connected between pins xtal and gnd. when using an external ceramic resonator, additional components may be required depending upon the ceramic resonator specifications (refer to the product type specification). by connecting a capacitor with a value of a few pico-farad in parallel with the resonator, the oscillator frequency can be decreased. by connecting a capacitor with a value of a few ten pico-farad in series with the resonator, the oscillator frequency can be increased. the oscillator starts when v dd reaches the operating voltage level v por and pin ce/fdi or pin ce/csi goes high. recommended resonator types: murata csa 3.58mg300fga or csac 3.58mgc300fga. 2000 may 19 18 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) i nternal reset circuit ( pins ce/fdi and ce/csi) a reset signal is internally generated to initialize the uba205xx as follows (see fig.18): by the on-chip power-on reset (por) circuit as long as v dd is lower than v por when the voltage on pin ce/csi and on pin ce/fdi are both low for a time greater than the reset delay time t rd . when reset conditions are fulfilled, pins mdy/tone and dp/fl are set to high-impedance; pins dmo, kt, led, r1 to r4 and c1 to c4 are set to low. c hip enable and frequency discriminator input ( pin ce/fdi) this input is used to activate and initialize part of the system. this pin together with the pin ce/csi determines which mode to enter (see table 2) and detects line power breaks during on-line states. to prevent the dialler from reacting on voltage disturbances on the telephone line, a time-out is active. the dialler returns to the standby state if the voltage on both pins ce/csi and ce/fdi is low for a time greater than t rd . in the exchange, several ac signals can be superimposed on the dc signal, e.g. dialling tone, busy tone, disturbances (such as line power breaks) and ringer signal. the ringer signal is evaluated and checked if its frequency is above a specified ringer frequency f ring . it is assumed that the frequency at pin ce/fdi is the same as the ringer frequency present on the telephone line. the signal at this pin is half-wave rectified so that the dialler can easily detect zero-crossing, especially at high frequency. during switching (on-hook/off-hook and pulse dialling) this pin is protected by its esd diodes. the maximum input current on these diodes should be below 1 ma. c hip enable /c radle switch input ( pin ce/csi) to distinguish between different operating states an extra ce/csi input is used. comparable to the ce/fdi input, the ce/csi activates the dialler part. from that moment the dialler part polls this input and the ce/fdi input regularly for line power breaks during on-line states. when pins ce/csi and ce/fdi are set low for a time greater than t rd , the standby state is entered. pin ce/csi is set high during the off-hook situation (basic application). the basic states are shown in table 2. table 2 uba205xx basic states notes 1. dont care. 2. ac signal at pin ce/fdi. during switching (on-hook/off-hook and pulse dialling) this pin is protected by its esd diodes. the maximum input current on these diodes should be below 1 ma. r inger melody ( pin mdy/tone) when an incoming ringer signal at pin ce/fdi is valid, the uba205xx starts generating a melody via the mdy/tone output ringer hardware (see fig.35). the signal at pin mdy/tone is a square wave signal (see fig.19). this melody follows the cadence of the ringer signal. both the melody and the volume can be selected via the keyboard. the melody frequencies and the duration are given in table 3. table 8 shows how a melody can be selected by pressing a key during ringing. the melody setting will be stored in the memory. the volume of the ringer circuit can be controlled by changing the amplitude of the square wave. the voltage level at pin mdy/tone can be changed as shown in table 9. the volume setting will be stored in the memory. mdy/tone is a push-pull output. mdy/tone is high-impedance when v dd 2000 may 19 21 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) t one dialler ( pins mdy/tone and led) the digits are transmitted as two simultaneously generated tones: the dual-tone multi-frequency (dtmf) system. these dual tones which are provided at the mdy/tone output are internally generated with two digital sine wave synthesizers together with digital-to-analog converters. their amplitudes are precisely scaled according to a band gap voltage reference. this ensures tone output levels independent of the supply voltage and temperature. the two sine waves are summed and then filtered by an on-chip switched capacitor filter, followed by an active rc low-pass filter. these guarantee that all dtmf tones generated fulfil the cept cs203 recommendations with respect to amplitude, frequency deviation, total harmonic distortion and suppression of unwanted frequency components. tone digits are separated by a pause time (t p ). at dialling, the dtmf input of the transmission part is enabled while the microphone and receive amplifier inputs are disabled. the signal at the dtmf input is sent to the receive output at a low level [see section dtmf amplification (pin dtmf)]. valid keys are the digits [0] to [9], [ * /t], [#], [r], [lnr/p] and [p ? t]. the dialling mode, the flash time and the access pause time depend on the resistor options: pts, ftsa, ftsb and apt (see fig.25 and table 7). figure 22 shows the timing diagram in tone dialling mode when keys [3], [3], [lnr/p], [4], [r] and [2] are pressed. in dtmf dialling mode, pin led of the uba205xa is set low after the hook-switch changes to off-hook and becomes high as soon as a key is pressed and the first dtmf code is sent. pin led is a push-pull output and is low when v dd 2000 may 19 23 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) k eyboard detector ( pins c1 to c4 and r1 to r4) the pins are directly connected to a traditional single contact keyboard. the keyboard is normally static with outputs r1 to r4 at low level and inputs c1 to c4 with internal pull-up resistors. when any key is pressed, scanning is done to detect which key has been pressed. a second key entry will be valid after having released the first key entry. simultaneously pressing several keys will result in no action. a key entry becomes valid when the depress debounce time t dd has elapsed (see fig.24). after the release of a valid key, the scanning is frozen when the release debounce time t rd has elapsed. the pins r1 to r4 are low and pull-down resistors replace pull-up resistors at pins c1 to c4 when v dd 2000 may 19 25 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) table 6 digits keypad activation and corresponding dtmf frequency pairs resistor options the resistors are connected between the pins of the keyboard (c1 to c3 and r1 to r4) and pin gnd. one resistor connection is shown in fig.26. the resistor options are read after each reset of the dialler. digit keys generated dtmf frequencies number of pulses f l (hz) f h (hz) [0] 941 1336 10 [1] 697 1209 1 [2] 697 1336 2 [3] 697 1477 3 [4] 770 1209 4 [5] 770 1336 5 [6] 770 1477 6 [7] 852 1209 7 [8] 852 1336 8 [9] 852 1477 9 [#] 941 1477 - [ * /t] 941 1209 - handbook, halfpage mgt048 r1 mbs fig.26 resistor connection. table 7 resistor functions notes 1. on = option resistor present; off = option resistor not present. 2. pin c3 belongs to resistor option ftsb. resistor to pin function conditions on (1) off (1) ftsa c2 ?ash time select ftsb = off; note 2 300 ms 98 ms ftsb = on; note 2 80 ms 600 ms mms c1 [ * /t] key de?nition [* /t] becomes [ *] [* /t] becomes [p ? t] mbs r1 make/break ratio select 33/66 40/60 apt r2 access pause time select 3.6 s 2.0 s pps r3 pulses per second 20 pps 10 pps pts r4 pulse/tone select pulse mode dtmf mode 2000 may 19 26 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) k ey tone ( pin kt) a keytone with a frequency f kt = 597 hz and a duration t kt = 30 ms (see fig.27) is generated each time a valid key is pressed resulting in the expected action, digit keys in tone dialling mode excepted. pin kt is a push-pull output and is set low when v dd 2000 may 19 28 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) o n - line state this section describes all the actions of the uba205xx during the on-line state. this state starts with making output dp/fl high (external pull-up resistor), which makes line current flow possible. the on-line state contains a number of sub-states (see fig.29): conversation state dialling state memory recall state program state. handbook, full pagewidth mgu187 conversation program dialling memory recall [lnr/p], [m1 to m3], [mem] + [0] to [9] [m1 to m3], [mem] + [0] to [9] on-hook/line break off-hook dial keys end of recall end [store] on-line standby off-hook ringer fig.29 on-line states. conversation state in this state, conversation is possible. dialling state during the dial-key entries the uba205xx starts immediately with transmission of the digit(s); the minimum transmission time is unaffected by the speed of the entry. transmission continues as long as further dial-key entries have to be processed. however when more than 32 digits are dialled the lnr memory will overflow and the last number redial function will be inhibited. there are two dial modes: pulse dialling and tone dialling. the initial dialling mode is determined by resistor option pts. the state machine which controls the dialling mode is illustrated in fig.30. 2000 may 19 29 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth mgm347 tone dialling pulse dialling dialling pts = on pts = off end dial keys [ * /t] or [p->t] [r] + pts = on conversation fig.30 dialling mode state machine. pulse dialling in this mode all valid keys are dialled by the pulse dialler. when, during pulse dialling, either [ * /t] when mms is off or [p ? t] is pressed, the uba205xx switches over to tone dialling (mixed mode dialling). after the switch over, valid keys are dialled by the tone dialler. the temporary tone mode is terminated by going on-hook or flash (recall). tone dialling the uba205xx converts valid key entries into data for the on-chip dtmf generator. tones are transmitted via output mdy/tone with a minimum tone burst/pause duration. the maximum tone burst duration is equal to the key pressing time. flash function the [r] key will result in pin dp/fl being set to low to generate a flash (line current interruption) with a selected time (ftsa and ftsb resistor options). pressing one digit after [r] key is pressed clears the lnr memory. when going on-hook after the [r] key is pressed, then digits previously dialled in the lnr memory are kept. access pause when the [lnr/p] button is not the first key pressed, an access pause is entered for repertory or redialling procedures. last number redial if the first key pressed is [lnr/p], the number stored in the lnr memory is dialled and sent. a maximum number of 32 digits can be stored in the lnr memory. if this maximum is exceeded the redial function is inhibited. pauses, which are stored in the lnr memory, are also dialled. the tone switch keys [ * /t] (when mms is off) and [p ? t] are also stored in the lnr memory. when a [ * /t] key (when mms is on) or [#] key occurs during pulse dialling, its code is not stored in the lnr memory. the lnr memory is always cleared when the [store] key is pressed. its content may also be programmed (see section program state (only uba2051x)). 2000 may 19 30 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) memory recall state (only uba2051x) repertory numbers can be dialled out after or before entering manual dialling, last number redial and by entering the memory locations in successive order. repertory recall is not possible as long as a dial out is pending. the three direct memory locations are numbered [m1] to [m3] and the ten indirect memory locations [mem] [1] to [mem] [0]. the stored numbers can be dialled by using one of the following procedures: press one of the direct memory keys [m1] to [m3] or press [mem], followed by one of the numeric keys [1] to [0], corresponding to the memory locations 1 to 10. in case [r] is included in one memory location, when the lnr capacity is exceeded by using it, the lnr function is inhibited. program state (only uba2051x) the program state can be entered from the conversation mode (on-line) when no dial out is pending. pressing the [store] key in this state puts the uba2051x in the program state and also clears the lnr memory. pressing the [store] key again in the program state will restart the program sequence. leaving the program state the program state can be left in one of the following ways: C by going on-hook; the entered digits are stored in the lnr memory C by ending the store procedures properly (see below), resulting in a proper store of the programmed item. programming repertory numbers a maximum number of 32 digits can be stored in the memory of repertory numbers (including access pauses, tone switch and flash) and can be achieved by using the following procedure: C press [store]; the lnr memory is cleared C press the sequence of digits that must be stored; the keys [0] to [9], [#], [lnr/p], [ * /t], [p ? t] or [r] may be used C store the number in the memory. memory overflow if more than 21 digits are entered the old memory contents is kept and the lnr memory is cleared. all the following digits are ignored, except the [store] key. the memory overflow state can be left: C by going on-hook C by pressing the [store] key again to restart the program sequence. clear repertory numbers clearing a memory location is possible by using the same procedure as for storing a number, except that no telephone number is entered: C press [store]; the lnr memory will be cleared C press one of the memory keys. notepad function in the conversation state it is possible to store a 21 digit number into the lnr memory, which may be dialled after an on-hook/off-hook action. the procedure is as follows: C press [store], the lnr memory will be cleared C press the sequence of digits that must be stored; the keys [0] to [9], [#], [lnr/p], [ * /t], [p ? t] or [r] may be used C go on-hook/off-hook. 2000 may 19 31 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) limiting values in accordance with the absolute maximum rating system (iec 60134). notes 1. calculated for t amb =75 c and t j = 125 c. 2. mostly dependent on the maximum required ambient temperature and on the voltage between pins ln and slpe (see fig.31). thermal characteristics note 1. mounted on glass epoxy board 28.5 19.1 1.5 mm. symbol parameter conditions min. max. unit p tot total power dissipation r slpe =20 w ; note 1 - 625 mw t amb ambient temperature - 25 +75 c t stg storage temperature - 40 +125 c t j junction temperature - 125 c speech/transmission part v ln positive continuous voltage on pin ln gnd - 0.4 12 v v ln(r) repetitive voltage on pin ln during switch-on or line interruption gnd - 0.4 13.2 v i ln line current r slpe =20 w ; note 2 - 140 ma v cc supply voltage for the speech/transmission part and peripherals gnd - 0.4 12 v v dd stabilized supply voltage for the dialler and ringer parts i dd 75 ma gnd - 0.4 3.6 v i dd input current at pin v dd for the dialler and ringer parts i line =0ma - 75 ma v n voltage on pins slpe, ir, reg, agc, dtmf, rx, qr, gar, mic+ and mic - gnd - 0.4 v cc + 0.4 v dialler and ringer parts v n voltage on pins 8 to 21 gnd - 0.4 v dd + 0.4 v i n dc sink/source current for pins 8 to 21 - 10 +10 ma symbol parameter conditions value unit r th(j-a) thermal resistance from junction to ambient in free air; note 1 70 k/w 2000 may 19 32 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, halfpage 212 150 30 70 110 fca134 46810 (2) (3) (4) (1) i ln (ma) v ln - v slpe (v) fig.31 safe operating area. (1) t amb =45 c; p tot = 1.000 w. (2) t amb =55 c; p tot = 0.875 w. (3) t amb =65 c; p tot = 0.750 w. (4) t amb =75 c; p tot = 0.625 w. 2000 may 19 33 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) characteristics i line = 15 ma; gnd = 0 v; r slpe =20 w ; pin agc connected to gnd; z line = 600 w ; f = 1 khz; f xtal = 3.579545 mhz; t amb =25 c; measured according to the test circuits of figs 32, 33 and 34; see also figs 37 and 38; unless otherwise speci?ed. symbol parameter conditions min. typ. max. unit supplies l ine interface ( pin ln) i line line current operating range normal operation 11 - 140 ma reduced performance 1 - 11 ma v ref stabilized reference voltage between pins ln and slpe 3.9 4.15 4.4 v v ln dc line voltage i line =1ma - 1.45 - v i line =4ma - 2.0 - v i line = 15 ma 4.05 4.35 4.65 v i line = 140 ma - 7.1 7.55 v v ln(rext) dc line voltage with external resistor external resistor r va = 44.2 k w (between pins ln and reg) - 3.6 - v d v ln(t) dc line voltage variation with temperature t amb = - 25 to +75 c; referenced to t amb =25 c - 40 - mv i nternal supply voltage ( pin v cc ) i cc internal current consumption v cc = 3.6 v - 1.25 1.5 ma v cc supply voltage for speech/transmission part and peripherals i p =0ma - 3.6 - v r egulated supply voltage ( pin v dd ) i sup input current of the v dd regulator current from pin ln not ?owing through pin slpe i line =1ma - 0 - ma i line =4ma - 2.15 - ma i line 3 11 ma - 4.5 - ma v dd regulated supply voltage speech mode; i dd = - 2.6 ma; v ln > 3.6 v + 0.25 v (typ.); i line 3 11 ma 3.0 3.3 3.6 v speech mode at reduced performance; i line =4ma - v ln - 0.35 - v ringer mode; i line = 0 ma; i dd =75ma 3.0 3.3 3.6 v 2000 may 19 34 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) i dd available supply current for peripherals in on-line mode i line 3 11 ma; dtmf generator on; no ac signal on the line --- 1.9 ma i line 3 11 ma; dtmf generator off; no ac signal on the line --- 2.6 ma i dd(mr) memory retention current (internal consumption on v dd ) i line = 0 ma; v cc discharging; v dd = 1.2 v -- 300 na v dd(mr) memory retention voltage 1.0 - 3.6 v v dd(por) power-on reset trip level note 1 1.3 1.65 2.0 v transmit stages m icrophone amplifier ( pins mic+ and mic - and ln) ? z i ? input impedance differential between pins mic+ and mic - - 68 - k w single-ended between pin mic+ or mic - and gnd - 34 - k w g v(tx) voltage gain from pins mic+ or mic - to ln v mic = 4 mv (rms) 43.2 44.2 45.2 db d g v(tx) voltage gain reduction of microphone ampli?er internal mute active - 80 - db d g v(tx)(f) voltage gain variation with frequency f = 300 to 3400 hz; referenced to f = 1 khz - 0.2 - db d g v(tx)(t) voltage gain variation with temperature t amb = - 25 to +75 c; referenced to t amb =25 c - 0.3 - db cmrr common mode rejection ratio - 80 - db v ln(max)(rms) maximum sending signal voltage level (rms value) i line = 15 ma; thd = 2% 1.8 2.15 - v i line = 4 ma; thd = 10% - 0.35 - v v n(ln) noise output voltage at pin ln psophometrically weighted (p53 curve); pins mic+ and mic - shorted through 200 w -- 78 - dbmp dtmf amplifier ( pin dtmf) ? z i ? input impedance - 21 - k w g v(dtmf) voltage gain from pin dtmf to pin ln in tone dialling mode; v dtmf = 20 mv (rms) - 26 - db d g v(dtmf) voltage gain reduction of dtmf ampli?er internal mute inactive - 80 - db d g v(dtmf)(f) voltage gain variation with frequency f = 300 to 3400 hz; referenced to f = 1 khz - 0.2 - db symbol parameter conditions min. typ. max. unit 2000 may 19 35 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) d g v(dtmf)(t) voltage gain variation with temperature t amb = - 25 to +75 c; referenced to t amb =25 c - 0.4 - db g v(ct) voltage gain from pin dtmf to pin rx (con?dence tone) in tone dialling mode; v dtmf = 20 mv (rms); r l2 =10k w ; -- 9.2 - db receive stages r eceive amplifier ( pins ir and rx) ? z i ? input impedance - 21.5 - k w g v(rx) voltage gain from pin ir to pin rx v ir = 4 mv (rms) 32.4 33.4 34.4 db d g v(rx) voltage gain reduction of receive ampli?er internal mute active - 80 - db d g v(rx)(f) voltage gain variation with frequency f = 300 to 3400 hz; referenced to f = 1 khz - 0.2 - db d g v(rx)(t) voltage gain variation with temperature t amb = - 25 to +75 c; referenced to t amb =25 c - 0.3 - db i o(rx)(max) maximum source and sink current on pin rx (peak value) i p = 0 ma; sine wave drive 50 --m a v rx(max)(rms) maximum receiving signal on pin rx (rms value) i p = 0 ma; sine wave drive; without r l2 ; thd = 2% 0.4 -- v v n(rx)(rms) noise output voltage at pin rx (rms value) pin ir open-circuit; r l2 =10k w ; psophometrically weighted (p53 curve) -- 86 - dbvp e arpiece amplifier ( pins gar and qr) g v(qr) voltage gain from pin rx to pin qr v ir = 4 mv (rms); r e1 =r gar = 100 k w - 0 - db d g v(qr) voltage gain setting range r e1 = 100 k w- 14 - +12 db v qr(max)(rms) maximum receiving signal on pin qr (rms value) i p = 0 ma; sine wave drive; r l1 = 150 w ; thd = 2% 0.3 0.38 - v i p = 0 ma; sine wave drive; r l1 = 450 w ; thd = 2% 0.46 0.56 - v v n(qr)(rms) noise output voltage at pin qr (rms value) ir open-circuit; r l1 = 150 w ; r e1 =r gar = 100 k w ; psophometrically weighted (p53 curve) -- 86 - dbvp r e1 = 100 k w ; r gar =25k w -- 98 - dbvp symbol parameter conditions min. typ. max. unit 2000 may 19 36 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) automatic gain control (pin agc) d g v(trx) voltage gain control range for microphone and receive ampli?ers i line = 85 ma; referenced to i line =15ma - 6.0 - db i start highest line current for maximum gain - 23 - ma i stop lowest line current for minimum gain - 59 - ma oscillator (pin xtal) v xtal dc voltage level - 0.5v dd - v r e(zi) real part of input impedance of pin xtal v xtal = 100 mv (rms); f xtal = 3.57 mhz -- 6 - k w control inputs (pins ce/csi and ce/fdi) v il low-level input voltage gnd - 0.4 - 0.2v dd v v ih high-level input voltage 0.8v dd - v dd + 0.4 v i li input leakage current gnd < v i 2000 may 19 38 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) timing characteristics symbol parameter conditions min. typ. max. unit timing k eyboard inputs / outputs ( pins c1 to c4 and r1 to r4) t dd keyboard depress debounce time - 20 - ms t rd keyboard release debounce time - 20 - ms k ey tone output ( pin kt) t kt keytone time - 30 - ms f kt keytone frequency - 597 - hz d ial pulse / flash output ( pin dp/fl) t idp interdigit pause time dialling rate 10 pps - 800 - ms dialling rate 20 pps - 500 - ms t fho ?ash holdover time - 40 - ms t mho mute holdover time - 15 - ms t ap access pause time resistor apt is not present - 2.0 - s resistor apt is present - 3.6 - s t ifp inter?ash pause time - 800 - ms t pdp pre-digit pause - 40 - ms t m make time dialling rate 10 pps resistor mbs is not present - 40 - ms resistor mbs is present - 33 - ms dialling rate 20 pps resistor mbs is not present - 20 - ms resistor mbs is present - 16 - ms 2000 may 19 39 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) t b brake time dialling rate 10 pps resistor mbs is not present - 60 - ms resistor mbs is present - 66 - ms dialling rate 20 pps resistor mbs is not present - 30 - ms resistor mbs is present - 33 - ms t ? ?ash time resistor ftsb is not present resistor ftsa is not present - 98 - ms resistor ftsa is present - 300 - ms resistor ftsb is present resistor ftsa is not present - 600 - ms resistor ftsa is present - 80 - ms d ial tone output ( pin mdy/tone) t t burst time - 85 - ms t p pause time - 85 - ms c hip enable inputs ( pins ce/csi and ce/fdi) t rd reset delay time - 280 - ms timing f ring ringer detection frequency 13 -- hz t d(res)(ring) ringer response delay <1.5 frequency cycle; v dd >v por -- 150 ms symbol parameter conditions min. typ. max. unit 2000 may 19 40 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) test and application information handbook, full pagewidth v cc v dd ln ce/csi c2 c3 r2 r3 r4 v ln ir 100 m f uba205xx r cc 619 w i dd x1 3.58 mhz i cc i line mdy/tone dp/fl mic - mic + dtmf qr gar ce/fdi rx c reg 4.7 m f r slpe 20 w reg agc slpe gnd c1 c vdd 220 m f c vcc 100 m f c gar r gar c gars c ear r e1 100 k w r l1 z line i line s1 v dtmf v o r1 xtal fca135 r l2 10 k w 100 nf 600 w v mic fig.32 test circuit for defining transmit gains. voltage gain defined as g v = 20 log ; v i =v mic or v dtmf . microphone gain: s1 = open. dtmf gain and confidence tone: s1 = closed. inputs not being tested should be open-circuit. only pins common to uba205xx are represented. pin 4 must be open-circuit. v o v i ------- 2000 may 19 41 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth v cc v dd ln ce/csi c2 c3 r2 r3 r4 v ln ir uba205xx r cc 619 w i dd x1 3.58 mhz i cc i line mdy/tone dp/fl mic - mic + dtmf qr gar ce/fdi rx c reg 4.7 m f r slpe 20 w r dtmf1 20 k w c dtmf 100 nf r dtmf2 2.74 k w reg agc slpe gnd c1 c vdd 220 m f c vcc 100 m f s1 v i r1 xtal fca136 v qr c gar c gars r e1 100 k w r l1 r l2 10 k w 100 nf 100 m f 220 nf z line i line 600 w r gar c ear fig.33 test circuit for defining receive gains and dtmf dialling levels. voltage gain defined as g v = 20 log ; v o =v qr or v rx . receive and earpiece gains: s1 = open. inputs not being tested should be open-circuit. only pins common to uba205xx are represented. pin r4 must be open-circuit. v o v i ------- 2000 may 19 42 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth fca137 v cc v cc v dd i dd ln r4 r3 r2 c3 c2 ir 10 m f uba205xx r cc 619 w v dd mic - mic + dtmf mdy/tone dp/fl qr gar ce/csi ce/fdi rx c reg 4.7 m f r slpe 20 w reg agc slpe gnd c1 r1 xtal x1 3.58 mhz fig.34 test circuit for defining regulated supply (v dd ) performance in ringer and trickle mode. inputs not being tested should be open-circuit. only pins common to uba205xx are represented. pin r4 must be open-circuit. 2000 may 19 43 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth mgt053 + h2 keytone 20 k w 100 nf 2.74 k w 100 k w 12 k w 1 2 3 4 5 6 7 8 9 10 11 12 13 14 220 m f (16 v) tr4 bc547 tr5 bc557 tr6 bc547 d2 bas11 d3 bas11 d4 bas11 d5 bas11 22 m f (35 v) z1 z2 bc558 tr2 3.9 w r prot bzx79c (8.2 v) bzd23c (10 v) or bzv85c (10 v) r2 r1 r trickle r ring 470 k w r3 470 k w 100 k w 130 k w 3.92 k w 130 w 392 w 820 w r slpe 20 w 620 w 470 k w 15 m w 2.2 k w (2 w) tr3 bf420 c s1-2 s1-1 c vrr 470 k w r csi br211 (220 v) c vdd 4.7 m f (25 v) c reg 1 m f c ring r5 r6 470 k w r fdi r vol r dtmf2 220 k w r4 r dtmf1 100 k w r mdy c dtmf z5 bzx79c (16 v) z4 bzx79c (18 v) d6 bas45 h1 ringer + r ast2 r ast1 c ir 100 nf r cc ln slpe reg ir agc dtmf v dd xtal dp/fl dmo ce/csi ce/fdi mdy/tone kt ic1 r bal1 r ast3 r bal2 tr1 bsp254a c bal 220 nf c a d1 a/b b/a 3.58 mhz x1 fig.35 application of the UBA2050 (continued in fig.36). 2000 may 19 44 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth mgt054 100 pf 1 nf 18 nf 18 nf 47 k w 22 k w 1 k w 22 k w 8.2 k w 100 k w r gar r tx2 r micm 1 k w 1 k w r micp r tx1 r tx3 r e1 c gar c gars c tx2 c tx1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 100 m f (10 v) 47 m f (25 v) lnr/p p- > t r 3 12 456 789 0# + mic1 c vcc c feed c ear r feed v cc mic - mic + rx gar qr gnd r1 r2 r3 r4 c1 c2 c3 ic1 earpiece a * /t 8 7 6 5 4 3 2 1 16 1 2 3 4 5 6 7 8 15 14 13 12 11 10 9 apt mbs pps pts mms ftsa ftsb 1 m w (7 ) r apt r mbs r pps r pts r mms r ftsb r ftsa 10 m f (16 v) fig.36 application of the UBA2050 (continued from fig.35). 2000 may 19 45 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth 20 k w 100 nf 2.74 k w 100 k w 1 2 3 4 5 6 7 8 9 10 11 12 13 14 220 m f (16 v) tr4 bc547 tr5 bc557 tr6 bc547 d2 bas11 d3 bas11 d4 bas11 d5 bas11 22 m f (35 v) z1 z3 z2 bc558 tr2 tr7 3.9 w bzx79c (8.2 v) bzx79c (4.3 v) 470 k w 220 k w 100 k w 130 k w 3.92 k w 130 w 392 w 820 w 620 w r dmo 470 k w 470 k w 15 m w 2.2 k w (2 w) tr3 bf420 bsn254a c s1-2 s1-1 470 k w dmo 1 m f 470 k w 220 k w 100 k w z5 z4 bzx79c (15 v) d6 bas45 + 100 nf dmo ln slpe reg ir agc dtmf v dd dp/fl dmo ce/csi c4 ce/fdi mdy/tone ic1 tr1 bsp254a c a mgt055 r trickle r ring br211 (220 v) c ring d1 a/b b/a 12 k w c vrr r5 r6 r fdi r vol r dtmf2 r4 r dtmf1 r mdy c dtmf bzx79c (16 v) h1 ringer xtal 3.58 mhz x1 b c vdd c reg r slpe 20 w r ast2 r ast1 c ir r bal1 r ast3 r bal2 c bal 220 nf r cc r prot bzd23c (10 v) or bzv85c (10 v) r2 r1 r3 r csi fig.37 application of the uba2051 (continued in fig.38). 2000 may 19 46 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) handbook, full pagewidth mgt056 100 pf 1 nf 18 nf 18 nf 22 k w 1 k w 22 k w 8.2 k w 100 k w r tx2 r micm r tx1 r tx3 r e1 c gar c gars c tx2 c tx1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 lnr/p p- > t r store 3 12 456 789 0# + mic1 c ear 10 m f (16 v) v cc mic - mic + 1 k w 1 k w r micp 100 m f (10 v) 47 m f (25 v) c vcc c feed r feed a rx gar qr gnd r1 r2 r3 r4 c1 c2 c3 c4 ic1 earpiece b * /t r gb3 3.65 k w r gb1 18.2 k w 22.1 k w r gar2 r gar1 22.1 k w c gb 1 m f (50 v) gain boost s3 m3 m2 m1 mem r gb2 7.15 k w 8 7 6 5 4 3 2 1 16 1 2 3 4 5 6 7 8 15 14 13 12 11 10 9 apt mbs pps pts mms ftsa ftsb 1 m w (7 ) r apt r mbs r pps r pts r mms r ftsb r ftsa fig.38 application of the uba2051 (continued from fig.37). 2000 may 19 47 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) package outline unit a max. a 1 a 2 a 3 b p cd (1) e (1) (1) eh e ll p q z y w v q references outline version european projection issue date iec jedec eiaj mm inches 2.65 0.30 0.10 2.45 2.25 0.49 0.36 0.32 0.23 18.1 17.7 7.6 7.4 1.27 10.65 10.00 1.1 1.0 0.9 0.4 8 0 o o 0.25 0.1 dimensions (inch dimensions are derived from the original mm dimensions) note 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 1.1 0.4 sot136-1 x 14 28 w m q a a 1 a 2 b p d h e l p q detail x e z c l v m a e 15 1 (a ) 3 a y 0.25 075e06 ms-013 pin 1 index 0.10 0.012 0.004 0.096 0.089 0.019 0.014 0.013 0.009 0.71 0.69 0.30 0.29 0.050 1.4 0.055 0.419 0.394 0.043 0.039 0.035 0.016 0.01 0.25 0.01 0.004 0.043 0.016 0.01 0 5 10 mm scale so28: plastic small outline package; 28 leads; body width 7.5 mm sot136-1 97-05-22 99-12-27 2000 may 19 48 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) soldering introduction to soldering surface mount packages this text gives a very brief insight to a complex technology. a more in-depth account of soldering ics can be found in our data handbook ic26; integrated circuit packages (document order number 9398 652 90011). there is no soldering method that is ideal for all surface mount ic packages. wave soldering is not always suitable for surface mount ics, or for printed-circuit boards with high population densities. in these situations reflow soldering is often used. re?ow soldering reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. several methods exist for reflowing; for example, infrared/convection heating in a conveyor type oven. throughput times (preheating, soldering and cooling) vary between 100 and 200 seconds depending on heating method. typical reflow peak temperatures range from 215 to 250 c. the top-surface temperature of the packages should preferable be kept below 230 c. wave soldering conventional single wave soldering is not recommended for surface mount devices (smds) or printed-circuit boards with a high component density, as solder bridging and non-wetting can present major problems. to overcome these problems the double-wave soldering method was specifically developed. if wave soldering is used the following conditions must be observed for optimal results: use a double-wave soldering method comprising a turbulent wave with high upward pressure followed by a smooth laminar wave. for packages with leads on two sides and a pitch (e): C larger than or equal to 1.27 mm, the footprint longitudinal axis is preferred to be parallel to the transport direction of the printed-circuit board; C smaller than 1.27 mm, the footprint longitudinal axis must be parallel to the transport direction of the printed-circuit board. the footprint must incorporate solder thieves at the downstream end. for packages with leads on four sides, the footprint must be placed at a 45 angle to the transport direction of the printed-circuit board. the footprint must incorporate solder thieves downstream and at the side corners. during placement and before soldering, the package must be fixed with a droplet of adhesive. the adhesive can be applied by screen printing, pin transfer or syringe dispensing. the package can be soldered after the adhesive is cured. typical dwell time is 4 seconds at 250 c. a mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. manual soldering fix the component by first soldering two diagonally-opposite end leads. use a low voltage (24 v or less) soldering iron applied to the flat part of the lead. contact time must be limited to 10 seconds at up to 300 c. when using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 c. 2000 may 19 49 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) suitability of surface mount ic packages for wave and re?ow soldering methods notes 1. all surface mount (smd) packages are moisture sensitive. depending upon the moisture content, the maximum temperature (with respect to time) and body size of the package, there is a risk that internal or external package cracks may occur due to vaporization of the moisture in them (the so called popcorn effect). for details, refer to the drypack information in the data handbook ic26; integrated circuit packages; section: packing methods . 2. these packages are not suitable for wave soldering as a solder joint between the printed-circuit board and heatsink (at bottom version) can not be achieved, and as solder may stick to the heatsink (on top version). 3. if wave soldering is considered, then the package must be placed at a 45 angle to the solder wave direction. the package footprint must incorporate solder thieves downstream and at the side corners. 4. wave soldering is only suitable for lqfp, tqfp and qfp packages with a pitch (e) equal to or larger than 0.8 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm. 5. wave soldering is only suitable for ssop and tssop packages with a pitch (e) equal to or larger than 0.65 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm. package soldering method wave reflow (1) bga, lfbga, sqfp, tfbga not suitable suitable hbcc, hlqfp, hsqfp, hsop, htqfp, htssop, sms not suitable (2) suitable plcc (3) , so, soj suitable suitable lqfp, qfp, tqfp not recommended (3)(4) suitable ssop, tssop, vso not recommended (5) suitable 2000 may 19 50 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) data sheet status note 1. please consult the most recently issued data sheet before initiating or completing a design. data sheet status product status definitions (1) objective speci?cation development this data sheet contains the design target or goal speci?cations for product development. speci?cation may change in any manner without notice. preliminary speci?cation quali?cation this data sheet contains preliminary data, and supplementary data will be published at a later date. philips semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. product speci?cation production this data sheet contains ?nal speci?cations. philips semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. definitions short-form specification ? the data in a short-form specification is extracted from a full data sheet with the same type number and title. for detailed information see the relevant data sheet or data handbook. limiting values definition ? limiting values given are in accordance with the absolute maximum rating system (iec 60134). stress above one or more of the limiting values may cause permanent damage to the device. these are stress ratings only and operation of the device at these or at any other conditions above those given in the characteristics sections of the specification is not implied. exposure to limiting values for extended periods may affect device reliability. application information ? applications that are described herein for any of these products are for illustrative purposes only. philips semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. disclaimers life support applications ? these products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. philips semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify philips semiconductors for any damages resulting from such application. right to make changes ? philips semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. philips semiconductors assumes no responsibility or liability for the use of any of these products, conveys no licence or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. 2000 may 19 51 philips semiconductors product speci?cation one-chip telephone ics with speech, dialler and ringer functions UBA2050(a); uba2051(a;c) notes ? philips electronics n.v. sca all rights are reserved. reproduction in whole or in part is prohibited without the prior written consent of the copyright owne r. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. no liability will be accepted by the publisher for any consequence of its use. publication thereof does not con vey nor imply any license under patent- or other industrial or intellectual property rights. internet: http://www.semiconductors.philips.com 2000 69 philips semiconductors C a worldwide company for all other countries apply to: philips semiconductors, international marketing & sales communications, building be-p, p.o. box 218, 5600 md eindhoven, the netherlands, fax. +31 40 27 24825 argentina: see south america australia: 3 figtree drive, homebush, nsw 2140, tel. +61 2 9704 8141, fax. +61 2 9704 8139 austria: computerstr. 6, a-1101 wien, p.o. box 213, tel. +43 1 60 101 1248, fax. +43 1 60 101 1210 belarus: hotel minsk business center, bld. 3, r. 1211, volodarski str. 6, 220050 minsk, tel. +375 172 20 0733, fax. +375 172 20 0773 belgium: see the netherlands brazil: see south america bulgaria: philips bulgaria ltd., energoproject, 15th floor, 51 james bourchier blvd., 1407 sofia, tel. +359 2 68 9211, fax. +359 2 68 9102 canada: philips semiconductors/components, tel. +1 800 234 7381, fax. +1 800 943 0087 china/hong kong: 501 hong kong industrial technology centre, 72 tat chee avenue, kowloon tong, hong kong, tel. +852 2319 7888, fax. +852 2319 7700 colombia: see south america czech republic: see austria denmark: sydhavnsgade 23, 1780 copenhagen v, tel. +45 33 29 3333, fax. +45 33 29 3905 finland: sinikalliontie 3, fin-02630 espoo, tel. +358 9 615 800, fax. +358 9 6158 0920 france: 51 rue carnot, bp317, 92156 suresnes cedex, tel. +33 1 4099 6161, fax. +33 1 4099 6427 germany: hammerbrookstra?e 69, d-20097 hamburg, tel. +49 40 2353 60, fax. +49 40 2353 6300 hungary: see austria india: philips india ltd, band box building, 2nd floor, 254-d, dr. annie besant road, worli, mumbai 400 025, tel. +91 22 493 8541, fax. +91 22 493 0966 indonesia: pt philips development corporation, semiconductors division, gedung philips, jl. buncit raya kav.99-100, jakarta 12510, tel. +62 21 794 0040 ext. 2501, fax. +62 21 794 0080 ireland: newstead, clonskeagh, dublin 14, tel. +353 1 7640 000, fax. +353 1 7640 200 israel: rapac electronics, 7 kehilat saloniki st, po box 18053, tel aviv 61180, tel. +972 3 645 0444, fax. +972 3 649 1007 italy: philips semiconductors, via casati, 23 - 20052 monza (mi), tel. +39 039 203 6838, fax +39 039 203 6800 japan: philips bldg 13-37, kohnan 2-chome, minato-ku, tokyo 108-8507, tel. +81 3 3740 5130, fax. +81 3 3740 5057 korea: philips house, 260-199 itaewon-dong, yongsan-ku, seoul, tel. +82 2 709 1412, fax. +82 2 709 1415 malaysia: no. 76 jalan universiti, 46200 petaling jaya, selangor, tel. +60 3 750 5214, fax. +60 3 757 4880 mexico: 5900 gateway east, suite 200, el paso, texas 79905, tel. +9-5 800 234 7381, fax +9-5 800 943 0087 middle east: see italy netherlands: postbus 90050, 5600 pb eindhoven, bldg. vb, tel. +31 40 27 82785, fax. +31 40 27 88399 new zealand: 2 wagener place, c.p.o. box 1041, auckland, tel. +64 9 849 4160, fax. +64 9 849 7811 norway: box 1, manglerud 0612, oslo, tel. +47 22 74 8000, fax. +47 22 74 8341 pakistan: see singapore philippines: philips semiconductors philippines inc., 106 valero st. salcedo village, p.o. box 2108 mcc, makati, metro manila, tel. +63 2 816 6380, fax. +63 2 817 3474 poland : al.jerozolimskie 195 b, 02-222 warsaw, tel. +48 22 5710 000, fax. +48 22 5710 001 portugal: see spain romania: see italy russia: philips russia, ul. usatcheva 35a, 119048 moscow, tel. +7 095 755 6918, fax. +7 095 755 6919 singapore: lorong 1, toa payoh, singapore 319762, tel. +65 350 2538, fax. +65 251 6500 slovakia: see austria slovenia: see italy south africa: s.a. philips pty ltd., 195-215 main road martindale, 2092 johannesburg, p.o. box 58088 newville 2114, tel. +27 11 471 5401, fax. +27 11 471 5398 south america: al. vicente pinzon, 173, 6th floor, 04547-130 s?o paulo, sp, brazil, tel. +55 11 821 2333, fax. +55 11 821 2382 spain: balmes 22, 08007 barcelona, tel. +34 93 301 6312, fax. +34 93 301 4107 sweden: kottbygatan 7, akalla, s-16485 stockholm, tel. +46 8 5985 2000, fax. +46 8 5985 2745 switzerland: allmendstrasse 140, ch-8027 zrich, tel. +41 1 488 2741 fax. +41 1 488 3263 taiwan: philips semiconductors, 6f, no. 96, chien kuo n. rd., sec. 1, taipei, taiwan tel. +886 2 2134 2886, fax. +886 2 2134 2874 thailand: philips electronics (thailand) ltd., 209/2 sanpavuth-bangna road prakanong, bangkok 10260, tel. +66 2 745 4090, fax. +66 2 398 0793 turkey: yukari dudullu, org. san. blg., 2.cad. nr. 28 81260 umraniye, istanbul, tel. +90 216 522 1500, fax. +90 216 522 1813 ukraine : philips ukraine, 4 patrice lumumba str., building b, floor 7, 252042 kiev, tel. +380 44 264 2776, fax. +380 44 268 0461 united kingdom: philips semiconductors ltd., 276 bath road, hayes, middlesex ub3 5bx, tel. +44 208 730 5000, fax. +44 208 754 8421 united states: 811 east arques avenue, sunnyvale, ca 94088-3409, tel. +1 800 234 7381, fax. +1 800 943 0087 uruguay: see south america vietnam: see singapore yugoslavia: philips, trg n. pasica 5/v, 11000 beograd, tel. +381 11 3341 299, fax.+381 11 3342 553 printed in the netherlands 403502/02/pp 52 date of release: 2000 may 19 document order number: 9397 750 06723 |
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