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1 rev. 7 july 1998 data sheet as2533...6 multi-standard cmos single chip telephone ic with dual soft clipping ? austria mikro systeme international ag package available in 28 pin soic or dip. line adaptation power extraction dc mask dialler soft clip agc li stb ri line current sense v dd cs ls mute ro m1 m2 z bal v dd mo fci melody sequencer ring frequency discrimination control logic hs/dp c4 c3 c2 c1 r4 r3 r2 r1 3.58 mhz osc vss a gnd la lb llc ram osc llc hi llc lo llc off as253x mode mfl tone generator a gnd led z2 z1 ci key pad key features q line/speech circuit, ld/mf repertory dialler and tone ringer on one 28 pin cmos chip q operating range from 13 to 100 ma (down to 5 ma with reduced performance) q soft clipping to avoid harsh distortion q volume control of receive signal q line loss compensation selectable by pin option q low noise (max. - 72 dbmp) q real or complex impedance q net 4 compatible q ld/mf switchable dialling q pacifier tone during programming q 31 digit last number redial q repertory memories (not as2534), 4 direct/10 indirect (as2533/6), 12 direct (as2535) q repeat dialling by busy or engaged (not as2535) q sliding cursor protocol with comparison q pause key for access pause or wait function q 3 flash keys, 100 ms, 280 ms and 375/600 ms q on chip mf filter (cept cs 203 compatible) q ring frequency discrimination q 3-tone melody generator block diagramme general description the as253x is a cmos integrated circuit that contains all the functions needed to form a high performance electronic telephone. the device incorporates ld/mf repertory dialling, melody generation, ring frequency discrimination and a high quality line/speech circuit. a ram is on chip for a 31 digit last number redial and memories (not as2534) each containing up to 21 digits/ data. the sliding cursor procedure makes the lnr function easy to use under various pabx systems. also centrex keys (not as2535) are provided. the device incorporate a volume control for the earpiece. the volume can be controlled by the vol key (+ 5.4 db) or by the C/+ keys (+8.1 db/-5.4 db in 5 steps). the versatility of the circuit is provided by pin options and a few external components. this allows easy adaptation to different ptt requirements.
2 rev. 7 july 1998 data sheet as2533...6 pin description pin # symbol function 23 m1 microphone inputs 24 m2 differential inputs for the microphone (electret). 3ro receive output this is the output for driving a dynamic earpiece with an impedance of 140 to 300 w . 5a gnd analogue ground this is the analogue ground for the amplifiers. 28 ri receive input this is the input for the receive signal. 6 stb side tone balance input this is the input for side tone cancellation. 1ls line current sense input this is the input for sensing the line current. 27 li line input this input is used for power extraction and line current sensing. 25 cs current shunt control output this n-channel open drain output controls the external high power shunt transistor for the modulation of the line voltage and for shorting the line during make period of pulse dialling. 4v dd positive voltage supply this is the supply pin for the circuit. 26 v ss negative power supply 8mo melody output pdm output of the melody generator for tone ringing. hi-z when not active. 21 fci frequency comparator input this is a schmitt trigger input for ring frequency discrimination. disabled during off-hook. 10 hs/dp hook switch input and dial pulse output this is an i/o that is pulled high by the hook switch when off-hook and an open drain pulls it low during break periods of pulse dialling and flash. 11 osc oscillator input pin for ceramic resonator (3.58 mhz). recommended: murata csa 3.58mg312am. 9 llc line loss compensation select pin for line loss compensation (see also figure 4 to 7). llc = a gnd : 20 - 50 ma llc = v dd : 45 - 75 ma llc = v ss : none. 22 led led output driver output for driving an led that will be flashing when in programme/mute state. continues
3 rev. 7 july 1998 data sheet as2533...6 pin description contd pin # symbol function 12 mode signalling mode select input mode pin function open dialling inhibited row 1 ld mode, 10 pps, 33/66 ms row 2 ld mode, 10 pps, 40/60 ms row 3 ld mode, 20 pps, 33/66 ms row 4 ld mode, 20 pps, 40/60 ms row 5 ld mode, 10 pps, 33/66 ms, temp. mf with tone on first * key entry row 6 mf only, 82/82 ms row 7 mf only, 82/160 ms during temporary mf: 82/160 ms 20 r1 keyboard rows 19 r2 (see key arrangement in figure 2) 18 r3 17 r4 16 c1 keyboard columns 15 c2 (see key arrangement in figure 2) 14 c3 13 c4 7ci complex impedance pin for complex impedance a capacitor should be connected to this pin. 2 mfl mf level setting a voltage divider connected from this pin to a gnd and v ss can be used to set the dtmf level. selection overview function as2533 as2534b as2534e as2535 as2536 direct memories (one-key) 4 0 0 12 4 indirect memories (two-key) 10 0 0 0 10 repeat dialling yes yes yes no yes lnr key yes yes yes yes yes pause insertion by lnr key yes yes yes yes yes pause (ps) key yes yes yes no yes p/m or mt key p/m p/m mt p/m p/m tone/pulse (t/p) key yes yes yes no yes temperary mf by * key yes yes yes yes yes centrex (a - d) keys yes yes yes no yes volume (vol, C/+) keys yes yes yes yes yes volume reset by off-hook yes no no yes no programming of tone ringer yes yes no yes yes r3 flash duration 600 ms 600 ms 375 ms 600 ms 600 ms
4 rev. 7 july 1998 data sheet as2533...6 keyboard connections key closure, r on max. = 1 kohm key open, r off min. = 1 mohm (either vol or +/C keys) p p / / m m 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 0 0 * * # # r r 1 1 r r 2 2 r r 3 3 l l n n r r v v o o l l + + a a b b c c d d r r p p p p s s t t / / p p c1 c2 c3 c4 r1 r2 r3 r4 figure 2b (as2534) p p / / m m 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 0 0 * * # # r r 1 1 r r 2 2 r r 3 3 l l n n r r v v o o l l + + a a b b c c d d r r p p p p s s t t / / p p m m 1 1 m m 2 2 m m 3 3 m m 4 4 c1 c2 c3 c4 r1 r2 r3 r4 m m r r figure 2a (as2533/6) for as2534e p/m is mt key.
5 rev. 7 july 1998 data sheet as2533...6 power on reset the on chip power on reset circuit monitors the supply voltage (v dd ) during off-hook. when v dd rises above approx. 1.2v, a power on reset occurs which clears the ram. dc conditions the normal operating range is from 13 ma to 100 ma. operating range with reduced performance is from 5 ma to 13 ma (parallel operation). in the operating range all functions are operational. at line currents below 13 ma the as253x provides an additional slope below 4.5v in order to allow parallel operation (see figure 13). the dc characteristic (excluding diode bridge) is determined by the voltage at li and the resistor r1 at line currents above 13 ma as follows: v ls = v li + i line r 1 the voltage at li is 4.5v in the normal operating range. during pulse dialling the speech circuit and other part of the device not operating is in a power down mode to save current. the cs pin is pulled to v ss in order to turn the external shunt transistor on to keep a low voltage drop at the ls pin during make periods. ac impedance the ac impedance of the circuit is set by external components. the impedance can be real or complex. the ac impedance is determined as follows: z ac = 33 z 1 the dc value of z1 should be 30 w to maintain correct dc performance. return loss and side tone cancellation can be determined independant of each other. speech circuit the speech circuit consists of a transmit and a receive path with dual soft clipping, mute, line loss compensation and sidetone cancellation. transmit the gain of the transmit path is 37 db for 600 w line termination from m1/m2 to ls (see test circuit figure 10). keyboard connections continued (either vol or +/C keys) figure 2c (as2535) p p / / m m 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 0 0 * * # # r r 1 1 r r 2 2 r r 3 3 l l n n r r v v o o l l + + m m 1 1 m m 2 2 m m 3 3 m m 4 4 m m 5 5 m m 6 6 m m 7 7 m m 8 8 m m 9 9 m m 1 1 0 0 m m 1 1 1 1 c1 c2 c3 c4 r1 r2 r3 r4 m m 1 1 2 2
6 rev. 7 july 1998 data sheet as2533...6 line loss compensation the line loss compensation is a pin option. when it is activated, the transmit and receive gains are decreased by 6 db at line currents from 20 to 50 ma when llc = a gnd and 45 to 75 ma when llc = high (@ r1 = 30 w ). the line loss compensation is disabled when llc = low (see figure 4 and 5). dialling functions valid keys the key scanning is enabled when hs/dpn is pulled high and v dd is above v ref . a valid key is detected from the keyboard by connecting the appropriate row to the column (r on < 1 k w) . this can be done using an n x m keyboard matrix with single contacts. four diodes are used to extend the number of rows (see keyboard arrangement fig. 2). it is also possible to connect a controller to the rows and columns (see application note an3010). p/m and mt key the p/m key (not as2534e) is used to enter the programme/mute state and the mt key for muting (as2534e only). depressing the p/m key mutes the speech circuit and the device is in programme state. repressing the p/m key deactivates the mute and programme state (toggle function).the mt key works in a similar way, but has no programme function. when programme/mute is activated, the led indication is turned on (flashing: 80 ms 'on' and 1 sec 'off'). dial mode selection the default mode (ld or mf) can be selected by the mode pin. when default ld mode is selected, a temporary change to mf can be invoked by pressing t/p key (not as2535) or the * key (when mode pin = row 5, the mf tone is generated with the first * key entry). the circuit will revert to ld by repression the t/p key (not as2535) or by pressing the r ( r1, r2 or r3 ) key or by next on- hook. when mf mode is selected by the mode pin, the circuit can not be changed temporary to ld but will remain in mf mode. centrex keys (not as2535) the alphameric keys accommodate easy use of centrex services. the a, b, c and d keys are only valid in mf mode (including temporary mf) and are not storable. pressing one of these keys will invoke the appropriate mf tones to be transmitted. the microphone input is differential with an input impedance of 20 k w . the soft clip circuit limits the output voltage at li to 2v peak (see figure 12). the attack time is 30 m s/6 db and the decay time is 20 ms/6 db. when mute is active, during dialling or after pressing the p/m key, the gain is reduced by > 60 db. receive the gain of the receive path is 3 db for 600 w line termination (test circuit figure 10). the receive input is the differential signal of ri and stb. when mute is active during dialling the gain is reduced by > 60 db. during dtmf dialling a mf comfort tone is applied to the receiver. the comfort tone is the dtmf signal with a level that is -30 db relative to the line signal. the receive gain can be changed by pressing the volume keys. the vol key gives a +5.4 db boost and has a toggle function, i.e. repressing the key resets the gain to default. as an alternative the +/C keys can be used. the + key increases the gain by 8.1 db in 3 steps and the C key decreases the gain by 5.4 db in 2 steps (total range 13.5 db). on as2533/5 the volume is reset to default by next off-hook and on as2534/6 the volume setting will remain at last setting. a por will always reset the volume to default. the soft clip circuit limits the voltage at the receive output (ro) to 1v peak (see figure 11). it prevents harsh distortion and acoustic shock. sidetone a good sidetone cancellation is achieved by using the following equation: z bal z line = z 2 z 1 the sidetone cancellation signal is applied to the stb input. z line z1 z2 z bal figure 3 side tone balance
7 rev. 7 july 1998 data sheet as2533...6 the centrex keys are not stored in the ram, and subsequently entered digits are buffered in fifo. last number redial lnr is a facility that allows resignalling of the last manually dialled number without keying in all the digits again. the lnr is repeatable after each off-hook. the current content of the ram is overwritten by new entries. a manually entered number is automatically stored in the lnr ram. the capacity of the ram is 31 digits. if a number greater than 31 digits is entered, the lnr facility will be inhibited (until new entries < 32 digits) and further entries will be buffered in fifo. pauses can be inserted by pressing the ps key (not as2535). post dialled digits, i.e. digits manually entered after lnr has been invoked, are not stored in ram but buffered in fifo. repeat dialling (not as2535) the last manually dialled number can be repeated without going on-hook by pressing the rp key. if a called number is engaged, pressing the rp key will break the line for 1.6 second (to get a new dial tone) and after a pause the number will be repeated. the repeat function is enabled when prior to pressing the rp key, a number has been dialled, and it can be invoked an unlimited number of times until next on-hook. during the 1.6 second break the device is in power down mode to save current. recall function a recall ( r1 , r2 or r3 key) activation will invoke a flash (timed loop break), however, the r1 flash is never executed in ld mode. r2 and r3 will be executed independent of the mode. if recall is the first entry in a digit string, it will be stored in lnr ram when digit(s) are entered after the recall. if the recall key is depressed after a digit string has been entered or dialled out, the recall will not be stored but buffered in the fifo together with subsequently entered digit. if pressing the recall key is not followed by digit entries, the lnr ram remains intact. after a recall a 270 ms pause will automatically be executed. memory keys (not as2534) the keys m1 to m12 are direct memory access keys and the mr key (as2533/6 only) is used for abbreviated dialling. memory arrangement as2533/6 as2534 as2535 storable numbers 14 0 12 direct memory keys 4 0 12 indirect memories 10 0 0 in the on chip ram, numbers can be stored. each number can contain up to 21 digits (including pauses). during programming multiple pauses can be inserted by pressing the ps (not as2535) or the lnr key. each pause inserted within the first 5 entries will automatically be terminated after 2 seconds whereas pauses inserted after location 5 in a digit string will halt dialling and can be terminated manually by pressing the ps (not as2535) or the lnr key. the halt function allows in-dialling to an extention on a pabx. example (45678C123 is stored in m1, where C is a pause/wait and 123 the extention number): off-hook, wait for dial tone press m1 (45678 is dialled out) await dial tone from called pabx press ps or lnr (123 is dialled out). memory dialling is cascadable. however, the content of one memory must be dialled out before a new can be invoked. sliding cursor procedure to accommodate easy and uncomplicated redialling (lnr) behind a pabx, a sliding cursor protocol is implemented. if new entries match the previous ram contents, pressing the lnr key will dial out the remaining digits. if there is an error in matching, the lnr will be inhibited until next on-hook, and the ram will contain the new number. example (lnr content 912345, where 9 is access code): off-hook, wait for pabx dial tone press 9 and wait for external dial tone press lnr (12345 will be dialled out). tone generator the tone generator incorporates the dtmf tones, 3 basic frequencies for the tone ringer and pacifier tones.
8 rev. 7 july 1998 data sheet as2533...6 dtmf the dtmf generator provides 8 frequencies, namely: low group digit 1-2-3-a 697 hz digit 4-5-6-b 770 hz digit 7-8-9-c 852 hz digit * -0-# -d 941 hz high group digit 1-4-7- * 1209 hz digit 2-5-8-0 1336 hz digit 3-6-9-# 1477 hz digit a-b-c-d 1633 hz (not as2535) the mf output level can be set with an external voltage divider on pin mfl. voltage at pin mfl (2) dtmf level (low group) 1.50 v (a gnd ) -4.0 dbm 1.27 v -5.2 dbm 1.15 v -6.4 dbm 1.03 v -7.6 dbm 0.90 v -8.8 dbm 0.70 v -10.0 dbm 0.54 v -11.2 dbm 0.42 v -12.4 dbm 0.30 v -13.6 dbm 0.18 v -14.8 dbm 0.00 v (v ss ) -16.0 dbm (z line = 600 ohm) the preemphasis is 2.6 db. the mf tones are according to cept recommendations. tone ringer (melody/volume) the three basic frequencies of the melodies are: f1 = 800 hz, f2 = 1067 hz, and f3 = 1333 hz ( 5%). the repetition rate and the volume of the tone ringer melodies can be programmed by pressing p/m and # followed by a digit as follows (not as2534e): digit repetition rate volume 1 1 time (50 ms pause) - 16 db 2 1 time (50 ms pause) - 7 db 3 1 time (50 ms pause) 0 db (max.) 4 4 time s - 16 db 5 4 times - 7 db 6 4 times (default) 0 db (max.) 7 10 times - 16 db 8 10 times - 7 db 9 10 times 0 db (max.) 0 none off the procedure is ended by repressing the p/m key. the default setting is digit 6, i.e. after a power on reset the device will start up with repetition rate 4 and maximum volume. if digit 0 is programmed, the tone ringer will be turned off until next off-hook where it will turn back to the last setting before 0 . the programmed settings are stored in the on chip ram. repetition rate means that a sequence of 6 frequencies is repeated 1, 4 or 10 times within 1 second. the sequence of the frequencies is controlled by the sequence register as follows: sequence f1 f2 f3 f1 f2 f3 the as2534e is fixed to default settings and can not be programmed to other settings. pacifier tone by mf dialling the dtmf tones are provided to the earpiece as comfort tone. during programming a key entry is acknowledged by a pacifier tone of 1477 hz. the level of the pacifier tone is approximately 60 mv at the ro output. the duration is 40 ms after every key entry in programme mode. when terminating the programme mode with the p/m key an acknowledge tone of 140 ms is provided. an invalid key entry, however, will cause a termination of the programme mode indicated by a rejection tone of 4 times 40 ms with 28 ms pauses between the tone bursts. ring frequency discrimination the ring frequency discriminator assures that only signals with a frequency between 13hz and 70 hz are regarded as valid ring signals. the time for recognising a valid ring signal is 1/f seconds, where 'f' is the ring frequency. when a valid ring signal is present for 73 ms continuously, the melody generator is activated and remains active as long as the ring signal is present. once the melody generator has been started, the ring signal is continuously monitored and the melody generator is instantly turned on or off according to the momentary presence of a valid or unvalid ring signal respectively (until next por or off-hook).
9 rev. 7 july 1998 data sheet as2533...6 typical characteristics of line loss compensation fig. 4 20 30 40 50 60 70 80 29 30 31 32 33 34 35 (db) tx gain (ma) dc line current llc = v ss llc = a gnd llc = v dd f = 800 hz z line = 600 w v ls = -10 dbm fig. 5 20 30 40 50 60 70 80 -2 -1 0 +1 +2 +3 +4 (db) rx gain (ma) dc line current llc = v ss llc = a gnd llc = v dd f = 800 hz z line = 600 w v ls = -10 dbm vol = 0 db (neutral)
10 rev. 7 july 1998 data sheet as2533...6 ac model of speech circuit figure 8 + z line 30 w 300 w z bal (10 x z line ) ri li cs ci stb ro comfort tones dtmf m1 m2 z syn (970 w ) z ref 32.3 x z ref + + + + 20 k 20 k 8 k 80 k 0 db + llc & sc llc & volume 26db 10db 23db 12db privacy mute sc
11 rev. 7 july 1998 data sheet as2533...6 typical application complex impedance (270 w + 750 w // 150 nf) figure 9 only the components necessary for presenting the complete functions of the as253x are included. the external components might change to comply with various national ptt regulations and to interface to different transducers. since the as253x is a component and not a complete system, it can not be approved as a stand alone part by the standard bodies. hence, full conformance to any standards is depending on the application in which the as253x is being used, and therefore, approvals by the standard bodies are the responsibility of the customer and austria mikro systeme will not have tested the product to meet specific standards. for further application information please refer to application note an2201. line adaptation power extraction dc mask dialler soft clip agc r1 30 w li stb ri line current sense v dd cs ls mute ro m1 m2 1k8 v dd mo 18v 10 m f fci melody sequencer ring frequency discrimination 470 m f control logic hs/dp c4 c3 c2 c1 r4 r3 r2 r1 100 k 3.58 mhz osc vss a gnd 2k2 0.68 m f llc 5m1 ram 5v1 220 k 220 k 300 w osc 330 k llc hi llc lo llc off as253x 100 m f 470 k 220 k 10 n mode 100 m 10 m 1 m 2k2 1k8 1k8 10 n 10 n 4148 r5 10 k 10v 1 m 10 m f mfl tone generator a gnd led ci bc547 47 k 2sa1209 bc327 2n5551 key pad (see fig. 2) 7k5 10 n 15 n 100 k 56 k 300 w
12 rev. 7 july 1998 data sheet as2533...6 operating procedures procedure principles the procedures for utilizing the features of the as253x are optimized out of consideration for the human factor in order to: - meet the users expectations - be easy to learn and relearn - not invoke any automatic functions which the user doesnt expect - protect the user from committing critial errors, e.g. dialling wrong numbers, deleting stored numbers, etc. - be consistent, simple and usable. the following pages describe the operating procedures for the provided features. pressing an unvalid key or key combination during programming will cause the device to abort the programme state. pressing any key combination or sequence which is not described or defined may cause the device to enter a state or mode that does not comply with the expectation of the user. in such cases, any undesired state can be terminated at any time by going on-hook / off-hook which will generate a functional reset. idle (on-hook, no ringing) speech mode programming false programme entry invalid entry text state according to text privacy mute x sec or time out (x sec.) dialling (ld or mf) storing (writing into ram) processing according to text text reading from memory k e y going off-hook going on-hook pressing a key entering a number entry according to text text symbols states entries processing
13 rev. 7 july 1998 data sheet as2533...6 programming tone ringer (not as2534e) p / m p / m m 1 - 1 2 programme state speech circuit muted led flashing # storing numbers any invalid key entry will abort programme state m r storing numbers digit repetition rate volume 1 1 time (slow) - 16 db 2 1 time (slow) - 7 db 3 1 time (slow) 0 db (max.) 4 4 times - 16 db 5 4 times - 7 db 6 4 times (default) 0 db (max.) 7 10 times (fast) - 16 db 8 10 times (fast) - 7 db 9 10 times (fast) 0 db (max.) 0 none off * *) when digit 0 (tone ringer off) has been programmed, the device will automatically return to the previous setting (different from 0) by next off-hook.
14 rev. 7 july 1998 data sheet as2533...6 temporary mf ram fifo fifo r r d fifo exit fifo pressing any other key does not change the state. * * t / p t / p t / p mode pin connected to row 1, 2, 3, 4 or 5 when mode pin = row 5, pressing the * key also transmits the tone by mf select. the t/p key (not as2535) can be used alternatively to the * key.
15 rev. 7 july 1998 data sheet as2533...6 storing numbers (not as2534) p / m p / m m 1 - 1 2 m r 0 - 9 programme state speech circuit muted led flashing # programming tone ringer melodies any invalid key entry will abort programme state entries (0-9, *, #, ps or lnr, r1, r2, r3) will be written directly into the selected memory location key entries different to the procedure will be ignored. exit programme mode from each state with on-hook or with the p/m key.
16 rev. 7 july 1998 data sheet as2533...6 automatic dialling or m 1 - 1 2 0 - 9 postdialled digits are not stored but buffered in fifo m r l n r
17 rev. 7 july 1998 data sheet as2533...6 timing diagrammes ld dialling mute mask hs/dpn t idp t pdp t m t idp t b t b t m t pdp t b t m mute mask hs/dpn t idp t pdp t m t idp t b t b t m t pdp t b t m t ap ld dialling with access pause mute mask hs/dpn tone t td t td t td t itp t itp t itp t ap mf dialling continues....
18 rev. 7 july 1998 data sheet as2533...6 flash mute mask hs/dpn t m t fd t m t pfp t m t fd t m rp key mute dialling hs/dpn power down number engaged new connection t rp t ap repeat dialling (not as2535)
19 rev. 7 july 1998 data sheet as2533...6 electrical characteristics absolute maximum ratings positive supply voltage ........................................................................................................ .......... -0.3v v dd 7v input current .................................................................................................................. ............................. 25 ma input voltage (ls) ............................................................................................................. ............ -0.3v v in 10v input voltage (li, cs) ......................................................................................................... ............. -0.3v v in 8v input voltage (stb, ri) ........................................................................................................ . -2v v in v dd + 0.3v input voltage (mo) ............................................................................................................. ......... -0.3v v in +35v digital input voltage .......................................................................................................... ..-0.3v v in v dd + 0.3v electrostatic discharge ........................................................................................................ ........................ 1000v storage temperature ............................................................................................................ ......... -65 c to +125 c recommended operating conditions supply voltage * (speech mode) ................................................................................................. ...... 4v v dd 5v oscillator frequency (resonator: murata csa 3.58m g312am) .............................................................. 3.58 mhz operating temperature .......................................................................................................... ......... - 25c to +70c * this voltage is generated internally dc characteristics (i line = 15 ma unless otherwise specified) symbol parameter conditions min typ max units i dd operating current speech mode 3 5 ma mf dialling 4 ma ld dialling, v dd = 2.5v 200 m a ring mode, v dd = 2.5v 300 m a i dd0 retention current idle mode, v dd = 2v 0.05 m a t amb = 25 c v li line voltage (default) 13 ma i line 100 ma 4.5 v i ol output current, sink v ol = 0.4v 1.5 ma cs, hs/dp, mo i ol output current, sink; led v ol = 0.4v 4 ma v il input low voltage hs/dpn; fci v ss 0.3 v dd v t amb = 25 c v ih input high voltage hs/dpn; fci 0.7 v dd v dd v t amb = 25 c
20 rev. 7 july 1998 data sheet as2533...6 ac characteristics (i line = 15 ma; f = 800 hz unless otherwise specified) tx transmit test circuit fig. 10 a tx gain, transmit m1/m2 to li 35.1 36.6 38.1 db d a tx/f variation with frequency f = 500 hz to 3.4 khz 0.8 db thd distortion v li 0.25v rms 2% v agc soft clip level v li =2v peak a sco soft clip overdrive 20 db t attack attack time 30 m s/6 db t decay decay time 20 ms/6db z in input impedance (m1/m2) 20 k w a mute mute attenuation mute activated 60 db v no noise output voltage t amb = 25 c -72 dbmp v in max input voltage range differential 1 v peak (m1/m2) single ended 0.5 v peak bjt output driver v in max input voltage range (li) 2 v peak v tx dynamic range 2 v peak rl return loss z rl =1000 w ; t amb = 25 c18 db d z ac/temp temperature variation 0.5 w/ c rx receive test circuit fig. 10 a rx receive gain (vol. default) li to ro 1.5 3 4.5 db a vol volume gain vol key +5.4 dbr a vol volume gain C/+ keys -5.4/+8.1 dbr d a rx/f variation with frequency f = 500 hz to 3.4 khz 0.8 db thd distortion v ri 0.25v rms 2% v agc soft clip level v ro =1v peak a sco soft clip overdrive 10 db t attact attact time v ri > 0.8v rms 30 m s/6 db t decay decay time 20 ms/6db v no noise output voltage t amb = 25 c -72 dbmp v ufc unwanted f. components 50 hz....20 khz -60 dbm z in input impedance (ri) 8 k w v in ri input voltage range (ri) 2 v peak a st sidetone cancellation v ri 0.25v rms 26 db v in st input voltage range (stb) 2 v peak z in input impedance (stb) 80 k w symbol parameter conditions min typ max units
21 rev. 7 july 1998 data sheet as2533...6 ac characteristics (contd) (i line = 15 ma; f = 800 hz unless otherwise specified) symbol parameter conditions min typ max units keyboard t d key debounce time 15 ms hs/dpn input t hs-l low to high debounce going off-hook 15 ms t hs-h high to low debounce not ld dialling 210 ms during ld dialling 270 ms dtmf f frequency deviation note 5 1.2 % v mf mf tone level (low group) mfl = a gnd - 2.5 - 4 - 5.5 db mfl = v ss - 14.5 - 16 - 17.5 db d v l-h preemphasis low to high 1.8 2.4 3.0 db v ufc unwanted f. componets 300 hz...5 khz -40 dbm note 3; mfl = v ss 5 khz...14 khz -50 dbm 14 khz...28.5 khz -70 dbm 28.5 khz...40 khz -80 dbm t td tone duration note 1&6; mode=row 6 or 7 80 82.3 85 ms t itp inter tone pause note1; mode=row 6 80 82.3 85 ms t itp inter tone pause note 1 & 6; mode=row 7 150 165 170 ms t tr tone rise time note 2 5 ms t tf tone fall time note 2 5 ms ld t dr dial rate mode = row 1, 2 or 5 9.53 10 10.5 pps mode = row 3 or 4 19.05 20 21 pps t /b break period mode = row 2 57 61.2 63 ms t /b break period mode = row 4 28.5 30.6 31.5 ms t /b break period mode = row 1 or 5 63 66 69 ms t /b break period mode = row 3 31.5 33 34.5 ms t m/ make period mode = row 2 38 40.8 42 ms t m/ make period mode = row 4 19 20.4 21 ms t m/ make period mode = row 1 or 5 31.5 33 34.5 ms t m/ make period mode = row 3 15.7 16.5 17.3 ms t pdp pre-digit pause 35 ms t idp inter digit pause mode = row 1, 2, 3, 4 or 5 800 840 880 ms t hs-h high to low debounce during ld dialling 270 ms t mo mute overhang t m
22 rev. 7 july 1998 data sheet as2533...6 symbol parameter conditions min typ max units t fd flash duration 1 r1 key 100 102 ms flash duration 2 r2 key 270 300 ms flash duration 3 r3 key (as2533/4b/5/6) 600 650 ms r3 key (as2534e only) 312 375 450 ms t pfp post flash pause 274 ms t ap access pause note 8 2.0 2.05 2.12 sec t rp repeat break time 1.6 sec tone ringer v mo melody output pdm t md melody delay 10 ms f1 frequency 1 800 hz f2 frequency 2 1067 hz f3 frequency 3 1333 hz t dt detection time initial 1/f + 73ms s t to detection time-out note 4 ms f min min. detection frequency 13 hz f max max. detection frequency 70 hz pacifier tone programme mode only f pt frequency p/m mode, key entry 1477 hz v rt level (ro) key entry 60 mv t rtd-e duration, key entry valid key entry, prog. 40 ms t rtd-a duration, acknowledge terminate with p/m key 140 ms t rtd-r duration, reject invalid key entry, note 7 4x40 ms led output t led-on "on-time" p/m state 80 ms t led-off interval p/m state 1 sec comfort tone (dtmf) v ct level (ro) relative to ls -30 dbr note 1: the values are valid during automatic dialling and are minimum values during manual dialling, i.e. the tones will continue as long as the key is depressed. note 2: the rise time is the time from 10% of final value till the tone amplitude has reached 90 % of its final value. note 3: relative to high group. note 4: the fci circuit is reset by por and hs/dpn pulled high (off-hook). after a reset the fci circuit is in a standby state. a positive edge on fci will start a 73 ms timer and the frequency discrimination is initiated. whenever a period of the ring signal is missing, the timer is reset. when a valid ring signal is present for 73 ms, the melody generator is started and is directly controlled by the ring signal. this condition will remain until a new reset. note 5: this does not include the frequency deviation of the ceramic resonator. note 6: during temporary mf mode. note 7: an invalid key entry in programme mode will invoke a tone sequence with 4 tone bursts of 40 ms and pauses between bursts of 28 ms and abort the programme mode. note 8: pauses inserted within the first 5 entries of a digit string will be automatically terminated after 2 seconds. pauses inserted after location 5 can only be terminated manually by pressing the ps or lnr key.
23 rev. 7 july 1998 data sheet as2533...6 test circuit figure 10 5v6 100 m ls 1 28 6 ri stb li cs 27 25 26 2 vss mfl fci 21 m1 m2 23 24 3 22 ro led 10 hs/dp 5 a gnd mo v dd 8 4 c1 c2 c3 c4 r1 r2 r3 r4 16 15 14 13 20 19 18 17 12 mode osc ci llc 11 7 9 multi-standard single chip telephone
24 rev. 7 july 1998 data sheet as2533...6 fig. 11 receive soft clipping and distortion fig. 12 transmit soft clipping and distortion 100 90 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 6 7 8 (v) vls vli (ma) line current typically no ac signals tamb: 25 c fig. 13 dc mask characteristic curves (typical) 2,00 1,75 1,50 1,25 1,00 0,75 0,50 0,25 0,00 0,0 0,2 0,4 0,6 0,8 1,0 1,2 0 1 2 3 4 5 6 7 8 9 10 11 12 line input voltage (ls) receive output voltage (ro) distortion (vp) (%) (vp) line current: 20 ma frequency: 800 hz tamb: 25 c typically soft clipping vro thd 150 125 100 75 50 25 0 0,0 0,5 1,0 1,5 2,0 2,5 0 1 2 3 4 5 6 7 8 9 10 microphone input voltage (m1/m2) line output voltage (ls) distortion (vp) (mvp) vls thd line current: 20 ma frequency tamb: 25 c typically soft clipping (%)
25 rev. 7 july 1998 data sheet as2533...6 pin configuration 28 pin soic (suffix t) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 ls mfl ro v dd a gnd stb ci hs/dp mo llc mode c4 c3 c2 ri li v ss cs m2 m1 led fci r1 osc r2 r3 r4 as253x c1 28 pin dip (suffix p) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 as253x ls mfl ro v dd a gnd stb ci mo llc hs/dp osc mode c4 c3 ri li v ss cs m2 m1 led fci r1 r2 r3 r4 c1 c2 ordering information device package memories volume centrex special keys as2533 t 28 pin soic 4 direct/10 indirect yes, note 1 a b c d p/m, lnr, r1-3, mr, rp, ps, t/p as2533 p 28 pin dip 4 direct/10 indirect yes, note 1 a b c d p/m, lnr, r1-3, mr, rp, ps, t/p as2534b t 28 pin soic none yes, note 2 a b c d p/m, lnr, r1-3, rp, ps, t/p as2534b p 28 pin dip none yes, note 2 a b c d p/m, lnr, r1-3, rp, ps, t/p as2534e p 28 pin dip none yes, note 2 a b c d mt, lnr, r1-3, rp, ps, t/p as2534e t 28 pin soic none yes, note 2 a b c d mt, lnr, r1-3, rp, ps, t/p as2535 t 28 pin soic 12 direct yes, note 1 no p/m, lnr, r1-3 as2535 p 28 pin dip 12 direct yes, note 1 no p/m, lnr, r1-3 as2536 t 28 pin soic 4 direct/10 indirect yes, note 2 a b c d p/m, lnr, r1-3, mr, rp, ps, t/p as2536 p 28 pin dip 4 direct/10 indirect yes, note 2 a b c d p/m, lnr, r1-3, mr, rp, ps, t/p conditions for delivery as dice see also data sheet as2533/4b/5/6-cx. note 1: volume is reset to default by on-/off-hook and by por note 2: volume is reset by por only. devices sold by austria mikro systeme/thesys are covered by the warranty and patent idemnification provisions appearing in its term of sale. austria mikro systeme/thesys makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the decri bed devices from patent infringement. austria mikro systeme reserves the right to change specifications and prices at any time and without notice. therefore, prior to designing this product into a system, it is necessary to check with austria mikro systeme for current information. this product is intended for use in normal commercial applications. applications requiring extended temperature ra nge, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equiment are specifically not recommended without additional processing by austria mikro systeme/thesys for each application. copyright ? 1995-8, austria mikro systeme international ag, schloss premst?tten, 8141 unterpremst?tten, austria. trademarks reg istered ?. all rights reserved. the material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished here by austria mikro systeme/thesys is believed to be correct and accurate. however, austria mikro s ysteme/thesys shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of b usiness or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. no obligation or li ability to recipient or any third party shall arise or flow out of austria mikro systeme/thesys rendering of technical or other services. application: for application support contact your local sales offices.

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