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rev. 4741b?cord?10/03 features dc characteristic adjustable transmit and receive gain adjustable symmetrical input of microphone amplifier anti-clipping in transmit direction automatic line-loss compensation symmetrical output of earpiece amplifier built-in ear protection dtmf and mute input adjustable sidetone suppression independent of sending and receiving amplification speech circuit with two sidetone networks built-in line detection circuit integrated amplifier for loud-hearing operation anti-clipping for loudspeaker amplifier improved acoustical feedback suppression power down voice switch tone ringer interface with dc/dc converter zero crossing detection common speaker for loud-hearing and tone ringer supply voltages for all functional blocks of a subscriber set integrated transistor for short-circuiting the line voltage answering machine interface operation possible from 10 ma line currents filters against emi on critical i/o applications feature phone answering machine fax machine speaker phone benefits savings of one piezoelectric transducer complete system integration of analog signal processing on one chip very few external components fewer components for emi protection description the microcontroller-controlled telephone circuit U4090B-P is a linear integrated circuit for use in feature phones, answering machines and fax machines. it contains the speech circuit, tone ringer interface with dc/dc converter, sidetone equivalent and ear protection rectifiers. the circuit is line powered and contains all components nec- essary for amplification of signals and adaptation to the line. an integrated voice switch with loudspeaker amplifier allows loud-hearing or hands- free operation. with an anti-feedback function, acoustical feedback during loud-hear- ing can be reduced significantly. the generat ed supply voltage is suitable for a wide range of peripheral circuits. monolithic integrated feature phone circuit emi improved U4090B-P
2 U4090B-P 4741b?cord?10/03 figure 1. block diagram figure 2. detailed block diagram mc with eeprom/ dtmf audio amplifier speech circuit voice switch tone ringer loudhearing and tone ringing g t m i c o t x i n s t o v l i m p s e l a g a i n d s e n s e g n d p d l i d e t r f d o t h a r e c i n s t i s s t i l r a c g r r e c o 2 r e c o 1 m u t r m u t x g s a m i c 1 m i c 2 d t m f t t x a i n l d r t l d r a t a f s s a o t s a c l s a i m i c t x a c l a c o u s t i c a l f e e d b a c k s u p p r e s s i o n c o n t r o l t r a n s m i t m u t e c o n t r o l s a c l m u t e r e c e i v e c o n t r o l i m p e d a n c e c o n t r o l p o w e r s u p p l y c u r r e n t s u p p l y i s u p p l y l i n e d e t e c t a g a c o n t r o l r e c e i v e a t t e n u a t i o n + - - + v m p s t b a l t x a i n l d t t l d t - 1 9 0 0 ? + + - - 1 2 6 4 1 2 5 7 8 9 1 1 1 0 3 1 6 1 5 2 3 2 2 2 4 2 5 2 6 2 0 2 7 2 1 1 9 1 4 1 3 2 8 3 1 3 0 2 9 3 8 3 7 3 6 3 3 3 5 3 4 3 2 4 2 3 9 4 1 4 0 4 3 4 4 1 7 1 8 d t m f r a 1 r a 2 s a s a i 6 0 0 ? v b v m p v m p s v m i r e f v r i n g c o s c s w o u t i l q s v l
3 U4090B-P 4741b?cord?10/03 pin configuration figure 3. pinning sso44 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 txin recin ttxa reco1 rac stil stis reco2 mutr sto iref aga tldr tldt inldr inldt atafs mutx sai gsa dtmf mico mic2 mic1 pd ind gnd sense sao swout cosc vring tha rfdo lidet impsel tsacl U4090B-P gt vl vb vmps gr vm vmp
4 U4090B-P 4741b?cord?10/03 pin description pin symbol function 1gt a resistor from this pin to gnd sets the amplification of the microphone and dtmf signals, the input amplifier can be muted by applying vmp to g t 2 dtmf input for dtmf signals, also used for the answering machine and hands-free input 3 mico output of microphone preamplifier 4 mic 2 non-inverting input of microphone amplifier 5 mic 1 inverting input of microphone amplifier 6pd active high input for reducing the current consumption of the circuit, simultaneously v l is shorted by an internal switch 7ind the internal equivalent inductance of the circuit is proportional to the value of the capacitor at this pin, a resistor connected to ground may be used to reduce the dc line voltage 8 vl line voltage 9 gnd reference point for dc- and ac-output signals 10 sense a small resistor (fixed) connected from this pin to v l sets the slope of the dc characteristic and also effects the line-length equalization characteristics and the line current at which the loudspeaker amplifier is switched on 11 vb unregulated supply voltage for peripheral circuits (voice switch), limited to typically 7 v 12 sao output of loudspeaker amplifier 13 vmps unregulated supply voltage for micorcontroller, limited to 6.3 v 14 vmp regulated supply voltage of 3.3 v for peripheral circuits (especially microprocessors), minimum output current: 2 ma (ringing) 4 ma (speech mode) 15 swout output for driving external switching transistor 16 cosc 40-khz oscillator for ringing power converter 17 vring input for ringing signal protected by internal zener diode 18 tha threshold adjustment for ringing frequency detector 19 rfdo output of ringing frequency detector 20 lidet line detect; output is low when the line current is more than 15 ma 21 impsel control input for selection of line impedance 1. 600 2. 900 3. mute of second transmit stage (txa); also used for indication of external supply (answering machine); last chosen impedance is stored 22 tsacl time constant of anti-clipping of speaker amplifier 23 gsa current input for setting the gain of the speaker amplifier, adjustment characteristic is logarithmical, or rgsa > 2 m , the speaker amplifier is switched off 24 sa i speaker amplifier input (for loudspeaker, tone ringer and hands-free use) 25 mutx three-state input of transmit mute: 1. speech condition; inputs mic1/mic2 active 2. dtmf condition; input dtmf active. a part of the input signal is passed to the receiving amplifier as a confidence signal during dialing 3. input dtmf used for answering machine and hands-free use; receive branch not affected 26 atafs attenuation of acoustical feedback suppression, maximum attenuation of afs circuit is set by a resistor at this pin, without the resistor, afs is switched off 27 inldt input of transmit level detector
5 U4090B-P 4741b?cord?10/03 note: filters against electromagnetic interference (emi) are located at following pins: mic1, mic2, recin, txin, stis, stil and rac. 28 inldr input of receive level detector 29 tldt time constant of transmit level detector 30 tldr time constant of receive level detector 31 aga automatic gain adjustment with line current, a resistor connected from this pin to gnd sets the starting point, maximum gain change: 6 db. 32 iref internal reference current generation; rref = 62 k ; iref = 20 a 33 sto sidetone reduction output output resistance approximate: 300 , maximum load impedance: 10 k . 34 vm reference node for microphone-earphone and loudspeaker amplifier, supply for electret microphone (im 700 ma) 35 mutr three-state mute input 1. normal operation 2. mute for ear piece 3. mute for recin signal condition of earpiece mute is stored 36 reco 2 inverting output of receiving amplifier 37 sti s input for sidetone network (short loop) or for answering machine 38 sti l input for sidetone network (long loop) 39 rac input of receiving amplifier for ac coupling in feedback path 40 reco 1 output of receiving amplifier 41 gr a resistor connected from this pin to gnd sets the receiving amplification of the circuit; amplifier ra1 can be muted by applying vmp to gr 42 ttxa time constant of anti-clipping in transmit path 43 recin input of receiving path; input impedance is typically 80 k 44 txin input of intermediate transmit stage, input resistance is typically 20 k pin description (continued) pin symbol function
6 U4090B-P 4741b?cord?10/03 dc line interface and supply-voltage generation the dc line interface consists of an electronic inductance and a dual-port output stage which charges the capacitors at v mps and v b . the value of the equivalent inductance is given by: l = r sense c ind ((r dc r 30 )/(r dc + r 30 )) in order to improve the supply during worst-case operating conditions, two pnp current sources - i bopt and i mpsopt - hand an extra amount of current to the supply voltages when the npns in parallel are unable to conduct current. a flowchart for the control of the current sources (figure 5) shows how a priority for sup- ply vmps is achieved. figure 4. dc line interface with electronic inductance and generation of a regulated and an unregulated supply figure 5. supply capacitors cmps and cb are charged with priority on cmps - + + - + - v l sense r sense < 5 ma 30 k ? 6.3 v 3.3 v 470 f 3.3 v/ 2 ma 7.0 v = = < 5 ma ind 10 ? c ind i bopt r 30 v offs r dc i mpsopt v mps v mp v b 47 f 220 f 10 f vsense - vb > 200 mv vsense - vm ps > 200 mv vb < 6.3 v charge cb (ibopt) charge cmps (impsopt) vmps < 6.3 v ibopt = 0 reduce ibopt (impsopt = 0) y n y impsopt = 0 n n n y y
7 U4090B-P 4741b?cord?10/03 figure 6. supply of functional blocks controlled by input voltages v l , v b , v ring and by logic inputs pd and impsel the U4090B-P contains two identical series regulators which provide a supply voltage v mp of 3.3 v suitable for a microprocessor. in speech mode, both regulators are active because v mps and v b are charged simultaneously by the dc-line interface. output cur- rent is 4 ma. the capacitor at v mps is used to provide the microcomputer with sufficient power during long-line interruptions. thus, long flash pulses can be bridged or an lcd display can be turned on for more than 2 seconds after going on hook. when the system is in ringing mode, v b is charged by the on-chip ringing power converter. in this mode only one regulator is used to supply v mp with a maximum of 2 ma. supply structure of the chip a major benefit of the chip is that it uses a very flexible supply structure which allows simple realization of numerous applications such as: group listening phone hands-free phone ringing with the built in speaker amplifier answering machine with external supply the special supply topology for the various functional blocks is illustrated in figure 6. there are four major supply states: 1. speech condition 2. power down (pulse dialing) 3. ringing 4. external supply power supply voltage regulator voltage regulator rfd txa txacl offsa comp afs imped contr qs pd lidet lidet rfdo es impsel v b rpc 7 v sai,sa sacl mic, dtmf aga, ra1, ra2 tx mute mut rec, stbal recatt 6.3 v v mp v mps v lon v l v ring
8 U4090B-P 4741b?cord?10/03 1. in speech condition the system is supplied by the line current. if the lidet-block detects a line voltage above the fixed threshold (1.9 v), the internal signal vlon is activated, thus switching off rfd and rpc and switching on all other blocks of the chip. at line voltages below 1.9 v, the switches remain in their quiescent state as shown in figure 7. offsacomp disables the group listening feature (sai, sa, sacl, afs) below line currents of approximately 10 ma. 2. when the chip is in power-down mode (pd = high), e.g., during pulse dialing, the internal switch qs shorts the line and all amplifiers are switched off. in this condi- tion, lidet, voltage regulators and imped contr are the only active blocks. 3. during ringing, the supply for the system is fed into v b via the ringing power con- verter (rpc). the only functional amplifiers are in the speaker amplifier section (sai, sa, sacl). 4. in an answering machine, the chip is powered by an external supply via pin v b . this application allows the possibility to activate all amplifiers (except the trans- mit line interface txa). selecting impsel = high impedance activates all switches at the es line. acoustic feedback suppression acoustical feedback from the loudspeaker to the handset microphone may cause insta- bility in the system. the U4090B-P offers a very efficient feedback suppression circuit, which uses a modified voice switch topology. figure 7 shows the basic system configuration. two attenuators (tx att and rx att) reduce the critical loop gain by introducing an externally adjustable amount of loss either in the transmit or in the receive path. the sliding control in block att contr determines, whether the tx or the rx signal has to be attenuated. the overall loop gain remains constant under all operating conditions. selection of the active channel is made by comparison of the logarithmically com- pressed tx- and rx- envelope curve. the system configuration for group listening, which is realized in the U4090B-P, is illus- trated in figure 9. txa and sai represent the two attenuators, the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes). figure 7. basic voice switch system log tx att att contr log rx att handset microphone loudspeaker hybrid line
9 U4090B-P 4741b?cord?10/03 figure 8. integration of the acoustic feedback suppression circuit into the speech circuit environment figure 9. acoustic feedback suppression by alternative control of transmit and speaker amplifier gain - gt mico tin inldt tldt vbg - + sto vl zint txa afs control aga max att. vbg + tldr reco1 gr stis stn sto sai sai gsa sao z l recin inldr vl aga tldt rldt inldt rldr inldr sai txa igsa iatgsa iagafs aga gsa atafs ratafs tldr tx rx i at i atafs
10 U4090B-P 4741b?cord?10/03 a detailed diagram of the afs (acoustic feedback suppression) is given in figure 9. receive and transmit signals are first processed by logarithmic rectifiers in order to pro- duce the envelopes of the speech at tldt and rldt. after amplification, a decision is made by the differential pair which direction should be transmitted. the attenuation of the controlled amplifiers txa and sai is determined by the emitter current iat which consists of three parts: i at = i atafs - i atgsa - i agafs g = i at 0.67 db/a figure 10 illustrates the principle relationship between speaker amplifier gain (gsa) and attenuation of afs (atafs). both parameters can be adjusted independently, but the internal coupling between them has to be considered. the maximum usable value of gsa is 36 db. the shape of the characteristic is moved in the x-direction by adjusting resistor ratafs, thus changing atafs m . the actual value of attenuation (atafs a ), however, can be determined by reading the value which belongs to the actual gain gsa a . if the speaker amplifier gain is reduced, the attenuation of afs is automatically reduced by the same amount in order to achieve a constant loop gain. zero attenuation is set for speaker gains gsa gsa0 = 36 db - atafs m . figure 10. reducing speaker amplifier gain results in an equal reduction of afs attenuation i atas sets maximum attenuation i atgsa decreases the attenuation when speaker amplifier gain is reduced i agafs decreases the attenuation according to the loop gain reduction caused by the aga function atafs (db) 36 db atafs m atafs a gsa o gsa a gsa (db) not usable ratafs ratafs
11 U4090B-P 4741b?cord?10/03 figure 11. line detection with two comparators for speech mode and pulse dialing line detection (lidet) the line current supervision is active under all operating conditions of the U4090B-P. in speech mode (pd = inactive), the line-current comparator uses the same thresholds as the comparator for switching off the entire speaker amplifier. the basic behavior is illus- trated in figure 12. actual values of ilon/iloff vary slightly with the adjustment of the dc characteristics and the selection of the internal line impedance. when power down is activated (during pulse dialing), the entire line current flows through the short-circuiting transistor qs (see figure 6). as long as il is above typically 1.6 ma, output lidet is low. this comparator does not use hysteresis. figure 12. line detection in speech mode with hysteresis ringing power converter (rpc) the rpc transforms the input power at vring (high voltage/low current) into an equiv- alent output power at v b (low voltage/high current) which is capable of driving the low- ohmic loudspeaker. input impedance at vring is fixed at 5 k and the efficiency of the step-down converter is approximate 65%. il pd lidet lidet iloff ilon il
12 U4090B-P 4741b?cord?10/03 figure 13. comparator thresholds depending on dc mask and line impedance ringing frequency detector (rfd) the U4090B-P offers an output signal for the microcontroller, which is a digital represen- tation of the double ringing frequency. it is generated by a current comparator with hysteresis. the input voltage v ring is transformed into a current via rtha. the thresh- olds are 8 a and 24 a. rfdo and v ring are in phase. a second comparator with hysteresis is used to enable the output rfdo as long as the supply voltage for the microprocessor vmp is above 2.0 v. 10 12 14 16 18 3 4 5 6 7 v l ( v ) i l (ma) 20 r dc = 68 k ? r dc = 130 k ? r dc = = ilon = iloff = ilon = iloff at line impedance = 600 ? at line impedance = 900 ? absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? ma y cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability . parameters symbol value unit line current i l 140 ma dc line voltage v l 12 v maximum input current, pin 17 i ring 15 ma junction temperature t j 125 c ambient temperature t amb -25 to +75 c storage temperature t stg -55 to +150 c total power dissipation, t amb = 60 cp tot 0.9 w thermal resistance parameters symbol value unit junction ambient sso44 r thja 70 k/w
13 U4090B-P 4741b?cord?10/03 electrical characteristics f = 1 khz, 0 dbm = 775 mv rms , i m = 0.3 ma, i mp = 2 ma, rdc = 130 k , t amb = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v impsel = gnd, v mutx = gnd, v mutr = gnd, unless otherwise specified parameters test conditions symbol min. typ. max. unit dc characteristics dc voltage drop over circuit i l = 2 ma i l = 14 ma i l = 60 ma i l = 100 ma v l 4.6 8.8 2.4 5.0 7.5 9.4 5.4 10.0 v transmission amplifier, i l = 14 ma, v mic = 2 mv, r gt = 27 k ? , unless otherwise specified range of transmit gain g t 40 45 50 db transmitting amplification r gt = 12 k r gt = 27 k g t 47 39.8 48 49 41.8 db frequency response i l 14 ma f = 300 to 3400 hz g t 0.5 db gain change with current pin 31 open i l = 14 to 100 ma g t 0.5 db gain deviation t amb = -10 to +60 c g t 0.5 db cmrr of microphone amplifier cmrr 60 80 db input resistance of mic amplifier r gt = 12 k r gt = 27 k r i 45 50 75 110 k distortion at line i l > 14 ma v l = 700 mv rms d t 2 % maximum output voltage i l > 19 ma, d < 5% v mic = 25 mv ctxa = 1 f v lmax 1.8 3 4.2 dbm impsel = open r gt = 12 k v micomax -5.2 dbm noise at line psophometrically weighted i l > 14 ma g t = 48 db no -80 -72 dbmp anti-clipping attack time release time ctxa = 1 f each 3 db overdrive 0.5 9 ms gain at low operating current i l = 10 ma i mp = 1 ma rdc = 68 k v mic = 1 mv i m = 300 a g t 40 42.5 db distortion at low operating current i l = 10 ma i m = 300 a i mp = 1 ma rdc = 68 k v mic = 10 mv d t 5 % line loss compensation i l = 100 ma r aga = 20 k g ti -6.4 -5.8 -5.2 db mute suppression a) mic muted (microphone preamplifier) b) txa muted (second stage) i l 14 ma mutx = open g tm 60 80 db impsel = open g ttx 60 db
14 U4090B-P 4741b?cord?10/03 receiving amplifier, i l = 14 ma, r gr = 62 k, unless otherwise specified, v gen = 300 mv adjustment range of receiving gain i l 14 ma, single ended differential mutr = gnd g r -8 -2 +2 +8 db receiving amplification r gr = 62 k differential r gr = 22 k differential g r -1.75 - 1 7.5 -0.25 db amplification of dtmf signal from dtmf in to reco 1, 2 i l 14 ma v mutx = v mp g rm 7 10 13 db frequency response i l > 14 ma, f = 300 to 3400 hz g rf 0.5 db gain change with current i l = 14 to 100 ma g r 0.5 db gain deviation t amb = -10 to +60 c g r 0.5 db ear-protection differential i l 14 ma, v gen = 11 v rms ep 2.2 v rms mute suppression a) recatt b) ra2 c) dtmf operation i l 14 ma mutr = open v mutr = v mp v mutx = v mp g r 60 db output voltage d 2% differential i l = 14 ma, z ear = 68 nf + 100 0.775 v rms maximum output current d 2% z ear = 100 4 ma (peak) receiving noise psophometrically weighted z ear = 68 nf + 100 i l 14 ma ni -80 -77 dbmp output resistance each output against gnd ro 10 line loss compensation r aga = 20 k , i l = 100 ma g ri -7.0 -6.0 -5.0 db gain at low operating current i l = 10 ma i mp = 1 ma i m = 300 a v gen = 560 mv rdc = 68 k g r -2 -1 0 db ac impedance v impsel = gnd v impsel = v mp z imp z imp 570 840 600 900 640 960 distortion at low operating current i l = 10 ma i mp = 1 ma v gen = 560 mv rdc = 68 k dr 5 % speaker amplifier minimum line current for operation no ac signal i lmin 15 ma input resistance pin 24 14 22 k gain from sai to sao v sai = 3 mv i l = 15 ma r gsa = 560 k r gsa = 20 k g sa 35.5 36.5 -3 37.5 db electrical characteristics (continued) f = 1 khz, 0 dbm = 775 mv rms , i m = 0.3 ma, i mp = 2 ma, rdc = 130 k , t amb = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v impsel = gnd, v mutx = gnd, v mutr = gnd, unless otherwise specified parameters test conditions symbol min. typ. max. unit
15 U4090B-P 4741b?cord?10/03 output power load resistance r l = 50 , d < 5% v sai = 20 mv i l = 15 ma i l = 20 ma p sa p sa 3 7 20 mw output noise (input sai open) psophometrically weighted i l > 15 ma n sa 200 v psoph gain deviation i l = 15 ma, t amb = -10 to +60 c g sa 1 db mute suppression i l = 15 ma v l = 0 dbm v sai = 4 mv pin 23 open v sao -60 dbm gain change with current i l = 15 to 100 ma g sa 1 db resistor for turning off speaker amplifier i l = 15 to 100 ma rg sa 0.8 1.3 2 m gain change with frequency i l = 15 ma, f = 300 to 3400 hz g sa 0.5 db attack time of anti-clipping 20 db over drive tr 5 ms release time of anti-clipping tf 80 ms dtmf amplifier test conditions: imp = 2 ma, im = 0.3 ma, v mutx = vmp adjustment range of dtmf gain i l = 15 ma mute active g d 40 50 db dtmf amplification i l = 15 ma v dtmf = 8 mv mute active: mutx = v mp g d 40.7 41.7 42.7 db gain deviation i l = 15 ma, t amb = -10 to +60 c g d 0.5 db input resistance r gt = 27 k r gt = 15 k r i 60 26 180 70 300 130 k distortion of dtmf signal i l 15 ma v l = 0 dbm d d 2 % gain deviation with current i l = 15 to 100 ma g d 0.5 db afs acoustic feedback suppression adjustment range of attenuation i l 15 ma 0 50 db attenuation of transmit gain i l 15 ma i inldt = 0 a r ata f s = 30 k i inldr = 10 a g t 45 db attenuation of speaker amplifier i l 15 ma i inldp = 0 a r ata f s = 30 k i inldr = 10 a g sa 50 db afs disable i l 15 ma v ata f s 1.5 v supply voltages, v mic = 25 mv, t amb = -10 to +60 c v mp i l = 14 ma rdc = 68 k i mp = 2 ma v mp 3.1 3.3 3.5 v electrical characteristics (continued) f = 1 khz, 0 dbm = 775 mv rms , i m = 0.3 ma, i mp = 2 ma, rdc = 130 k , t amb = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v impsel = gnd, v mutx = gnd, v mutr = gnd, unless otherwise specified parameters test conditions symbol min. typ. max. unit
16 U4090B-P 4741b?cord?10/03 v mps i l = 100 ma rdc = infinite i mp = 0 ma v mps 6.7 v v m i l w 14 ma i m = 700 a rdc = 130 k v m 1.3 3.3 v v b i b = + 20 ma i l = 0 ma v b 7 7.6 v ringing power converter, imp = 1 ma, im = 0 maximum output power v ring = 20.6 v p sa 20 mw threshold of ring frequency detector rfdo: low to high v hyst =v ring on - v ring off v ringon v hyst 17.5 11.0 v input impedance v ring = 30 v r ring 4 5 6 k input impedance in speech mode f = 300 hz to 3400 hz i l > 15 ma v ring = 20 v + 1.5 v rms r ringsp 150 k logic level of frequency detector v ring = 0 v v b = 4 v v ring = 25 v v rfdo 0 v mp v ring detector enable v ring = 25 v, rfdo high v mpon 1.8 2.0 2.2 v zener diode voltage i ring = 25 ma v ringmax 30.8 33.3 v mutr input mutr input current v mutr = gnd i l > 14 ma v mutr = v mp i mute -20 +10 -30 a mutr input voltage mute low; i l > 14 ma v mute 0.3 v mute high; i l > 14 ma v mute vmp - 0.3 v v pd input pd input current pd active, i l > 14 ma v pd = v mp i pd 9 a input voltage pd = active pd = inactive v pd v pd 2 0.3 v voltage drop at v l i l = 14 ma, pd = active i l = 100 ma, pd = active v l 1.5 1.9 v input characteristics of impsel input current i l 14 ma v impsel = v mp v impsel = gnd i impsel i impsel 18 -18 a a input voltage input high v impsel v mp - 0.3 v v input low v impsel 0.3 v mutx input input current v mutx = v mp v mutx = gnd i mutx i mutx 20 -20 30 -30 a a electrical characteristics (continued) f = 1 khz, 0 dbm = 775 mv rms , i m = 0.3 ma, i mp = 2 ma, rdc = 130 k , t amb = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v impsel = gnd, v mutx = gnd, v mutr = gnd, unless otherwise specified parameters test conditions symbol min. typ. max. unit
17 U4090B-P 4741b?cord?10/03 U4090B-P control input voltage input high v mutx v mp - 0.3 v v input low v mutx 0.3 v line detection line current for lidet active pd = inactive ilon 12.6 ma line current for lidet inactive pd = inactive iloff 11.0 ma current threshold during power down v b = 5 v, pd = active ilonpd 0.8 1.6 2.4 ma electrical characteristics (continued) f = 1 khz, 0 dbm = 775 mv rms , i m = 0.3 ma, i mp = 2 ma, rdc = 130 k , t amb = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v impsel = gnd, v mutx = gnd, v mutr = gnd, unless otherwise specified parameters test conditions symbol min. typ. max. unit table 1. selection of tx mute and line impedance logic level impsel mode 0 line impedance = 600 txa = on es = off speech 0 to z line impedance = 600 txa = off es = on transmit-mute 1 to z line impedance = 900 txa = off es = on transmit-mute 1 line impedance = 900 txa = on es = off speech table 2. selection of earpiece mute and answering machine mode logic level mutr mode 0 ra2 = on recatt = on stis + stil = on speech 0 to z ra2 = on recatt = off stis = on, stil = off for answering machine 1 to z ra2 = off recatt = off stis = on, stil = off aga off for stis for answering machine 1 ra2 = off recatt = on stis + stil = on speech + earpeace mute
18 U4090B-P 4741b?cord?10/03 explanation of abbreviations recatt = receive attenuation stis, stil = inputs of sidetone balancing amplifiers es = external supply afs = acoustic feedback suppression control aga = automatic gain adjustment ra2 = inverting receive amplifier txacl = transmit anti-clipping control table 3. selection of transmit mute logic level mutx mode 0 mic 1/2 transmit enabled receive enable afs = on aga = on txacl = on speech z dtmf transmit enabled receive enable afs = on aga = on txacl = on for answering machine 1 dtmf transmit enabled dtmf to receive enable afs = off aga = off txacl = off dtmf dialling table 4. specification of logic levels logic level 0 = < (0.3 v) z = > (1 v) < (vmp - 1 v) or (open input) 1 = > (vmp - 0.3 v)
19 U4090B-P 4741b?cord?10/03 figure 14. typical dc characteristic figure 15. typical adjustment range of transmit gain figure 16. typical adjustment range of receive gain (differential output) 0 2 4 6 8 10 12 0 102030 40 5060 7080 90100 i l (ma) v l (v) rdc = 68k rdc = 130k rdc = infinity 35 37 39 41 43 45 47 49 51 53 0 5 10 15 20 25 30 35 40 rgt (k ? ) g t (db) -4 -2 0 2 4 6 8 10 0 1020304050607080 rgr (k ? ) gr (db)
20 U4090B-P 4741b?cord?10/03 figure 17. typical aga characteristic figure 18. typical load characteristic of v b for a maximum (rdc = infinity) dc-characteristic and 3-mw loudspeaker output -7 -6 -5 -4 -3 -2 -1 0 0 1020 30 40 5060 7080 90100 i l (ma) aga (db) r aga = 24k r aga = 20k r aga = 16k 0 1.0 2.0 3.0 4.0 5.0 6.0 0 2 4 6 8 1012141618 i b (ma) v b (v) i l = 30 ma i l = 20 ma i l = 15 ma rdc = infinity; vi = 200 mv/1 khz; psao = 3 mw; imp = 2 ma; im = 300 a; rgsa = 560k
21 U4090B-P 4741b?cord?10/03 figure 19. typical load characteristic of v b for a medium dc-characteristic (rdc = 130 k ) and 3-mw loudspeaker output figure 20. typical load characteristic of v b for a minimum dc-characteristic (rdc = 68 k ) and 3-mw loudspeaker output 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 2 4 6 8 1012141618 i b (ma) v b (v) i l = 30 ma i l = 20 ma i l = 15 ma rdc = 130 k; vi = 200 mv/ 1 khz; psao = 3 mw; imp = 2 ma; im = 300 a; rgsa = 560k 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 2 4 6 8 10 12 14 16 18 i b (ma)) v b (v) i l = 30 ma i l = 20 ma i l = 15 ma rdc = 68 k, vi = 200 mv, psao = 3 mw; imp = 2 ma; im = 300 a; rgsa = 560k
22 U4090B-P 4741b?cord?10/03 figure 21. basic test circuit u 4 0 9 0 b - p 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 o p e n m i c o o p e n o p e n v m p 2 2 0 n f 1 5 0 n f v l v m p 4 7 n f 4 7 n f i m 3 . 3 n f 3 . 3 n f 2 m ? r g r r g t 6 8 n f r d c 6 0 0 ? 4 . 7 n f s 1 i l b c 5 5 6 2 . 2 m h s d 1 0 3 a d c v r i n g 6 8 n f s 2 1 f 1 0 f r g s a v m r e f e r e n c e f i g u r e f o r n o t c o n n e c t e d p i n s s 1 = c l o s e d : s p e e c h m o d e s 2 = c l o s e d : r i n g e r m o d e z e a r 1 0 f 6 2 k ? 3 6 k ? 3 6 k ? 1 0 0 f v m p v m v m v m 3 k ? 3 k ? 1 0 f 1 f 1 k ? 1 0 f 2 2 f 1 0 ? 4 7 f 1 0 0 0 f 5 0 ? 2 2 0 f 4 7 f i d c i m p 6 8 0 k ?
23 U4090B-P 4741b?cord?10/03 figure 22. test circuit for dc characteristics and line detection u 4 0 9 0 b - p 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 m i c o i m v 2 2 0 n f 1 5 0 n f r g r 1 0 0 f r a g a 3 0 k ? d c r g t 6 8 n f r d c 4 . 7 n f 1 0 ? v b s 1 b a o p e n 1 0 0 0 f 1 f m v r g s a l i n e d e t e c t i o n : s 1 a v b ( e x t e r n a l s u p p l y ) : s 1 b o p e n p i n s s h o u l d b e c o n n e c t e d a s s h o w n i n f i g u r e 2 7 z e a r v l i d e t 6 2 k ? 1 0 f v m v l 1 f v m i c v m p 1 0 f i l v l i b 2 2 0 f 4 7 f i m p
24 U4090B-P 4741b?cord?10/03 figure 23. test circuit for transmission amplifier i n p u t r e s i s t a n c e : r i = 50 k vl (s2 = clos ed) vl (s2 = open) - 1 tra nsmitting amplification g t = 20 log vl vmic line loss compensation: ? gti = gt (at il = 100 m a) - gt (at il = 14 ma), s3 = closed gain change with current: ? gti = gt (at il = 100 ma) - gt (at il = 14 ma) common mode r ejection ratio: cmrr = 2 0 log vcm vl + gt with s1b, s2 = closed, s3 = open mute suppression : gtm = 20 log vl (at mutx = low) v l (at mutx = open) gttx = 20 log vl (at impsel = low) vl ( at impsel = open) open pins shoul d be connected as shown in figure 27 u 4 0 9 0 b - p 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 mico v l v 220 nf 150 nf rgr 10 f 62 k ? raga rgt 68 nf rdc i l 220 f 1 f open open v m p 4.7 nf 22 f ac s3 s1 b s2 s1 a b a open 1 f zear rdc vl , dt, n o v mic v cm v v m i c o m a x v m p v m 1 f i m 1 0 0 f 2 5 k ? 2 5 k ? 6 0 0 ? 2 2 f 1 0 ? 1 0 0 0 f 4 7 f i m p v m p
25 U4090B-P 4741b?cord?10/03 figure 24. test circuit for receiving amplifier u 4 0 9 0 b - p 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 m i c o v 2 2 0 n f 1 5 0 n f r g r 1 0 0 f 6 2 k ? r a g a r g t 6 8 n f r d c 1 f o p e n o p e n 2 2 0 n f v s 2 4 . 7 n f v m p o p e n s 1 a b a c l i n e l o s s c o m p e n s a t i o n : ? g r i = g r ( a t i l = 1 0 0 m a ) - g r ( a t i l = 1 4 m a ) , s 3 = c l o s e d r e c e i v i n g n o i s e : s 1 a r e c e i v e a m p l i f i c a t i o n : g r = 2 0 l o g ( v z e a r / v l r ) d b ( s 1 = b , s 2 o p e n ) d t m f - c o n t r o l s i g n a l : g r m = 2 0 l o g ( v z e a r / v d t m f ) d b ( s 1 = a , s 2 = c l o s e d ) a c - i m p e d a n c e : ( v l r / ( v g e n - v l r ) ) z l m u t e s u p p r e s s i o n : a ) r e c a t t : ? g r = 2 0 l o g ( v l r / v z e a r ) d b + g r , m u t r = o p e n b ) r a 2 : ? g r = 2 0 l o g ( v l r / v z e a r ) d b + g r , m u t r = v m p c ) d t m f o p e r a t i o n : ? g r = 2 0 l o g v l r / v z e a r ) d b + g r , m u t x = v m p o p e n p i n s s h o u l d b e c o n n e c t e d a s s h o w n i n f i g u r e 2 7 z e a r v z e a r , d r s 3 v m p i m v m p v m 1 0 f 1 f v l v m 1 k ? v d t m f 1 0 f 6 0 0 ? 2 2 f v g e n i l 1 0 ? 2 2 0 f 1 0 0 0 f v l r 4 7 f i m p
26 U4090B-P 4741b?cord?10/03 figure 25. test circuit for speaker amplifier u 4 0 9 0 b - p 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 m i c o v m i c v 2 2 0 n f 1 5 0 n f r g r 1 0 f r g s a 3 0 k ? r g t 6 8 n f r d c 4 . 7 n f o f f s 4 vatafs 2 0 k ? 2 2 0 n f v s 1 v 1 0 f z e a r v s a i v s a o , s 4 = c l o s e d v z i n , s 4 = o p e n n s a i n p u t i m p e d a n c e : ( v z i n / ( v s a o - v z i n ) ) r i n g a i n f r o m s a i t o s a o : 2 0 l o g ( v s a o / v s a i ) d b o u t p u t p o w e r : p s a = v s a o 2 r s a o a t t e n u a t i o n o f t r a n s m i t g a i n : s 1 = c l o s e d o p e n p i n s s h o u l d b e c o n n e c t e d a s s h o w n i n f i g u r e 2 7 v i i n l d t i i n l d r 1 0 f 6 2 k ? v m 1 f 1 f v l i d e t i m p 4 7 f 1 0 0 0 f 4 7 f 2 2 0 f 2 2 f 5 0 ? 6 0 0 ? 1 0 ? i l 1 0 f v l
27 U4090B-P 4741b?cord?10/03 figure 26. test circuit for dtmf amplifier u 4 0 9 0 b - p 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 m i c o v l i m v 2 2 0 n f 1 5 0 n f r g r 1 0 0 f 6 2 k ? r g t 6 8 n f v m r d c i l 1 f v m p 2 2 0 n f v s 3 4 . 7 n f o p e n a c z e a r d t m f - a m p l i f i e r : 2 0 l o g ( v l / v d t m f ) d b i n p u t r e s i s t a n c e : ( v l 5 0 k / ( v l - v l 5 0 k ) ) 5 0 k ? o p e n p i n s s h o u l d b e c o n n e c t e d a s s h o w n i n f i g u r e 2 7 v l : s 3 = c l o s e d v l 5 0 k ? : s 3 = o p e n d d 1 0 f v m 1 f v g e n 3 5 0 k ? 1 k ? v d t m f 1 0 f 1 0 ? 2 2 0 f 1 0 0 0 f 4 7 f i m p
28 U4090B-P 4741b?cord?10/03 figure 27. test circuit for ringing power converter 4) input impedance in speech mode (il > 15 ma): 1) max. output power: 3) input impedance: 2) threshold of ringing frequency detector: detecting vrfdo, when driving vring from 2 v to 22 v (vringon) and back again (vringoff) (s2 = closed) 5) ring detector enable: detecting vrfdo, when driving vmp from 0.7 v to 3.3 v (vmpon) and back again (vmpoff) (s5, s3 = closed) open pins should be connected as shown in figure 27 U4090B-P 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 v sai 100 f 62 k ? rgsa 68 nf rdc 4.7 nf 10 ? bc556 2.2 mh sd103a 68 nf s5 1 f 680 k ? v sao 100 nf 1.8 v pp 1 khz ramp v v 1.5 v 20 v ramp 20.6 v dc dc dc s1 s2 s3 s4 i ring v rfdo i ring v ring v ring 47 f 47 f 1000 f 50 ? i mp v mp 220 f i l 10 f ) closed 4 s ( rsao vsao psa 2 ) closed 3 s ( iring vring rring ) closed 1 s ( iring vring rringsp
29 U4090B-P 4741b?cord?10/03 figure 28. test circuit for input characteristics of i/o ports u 4 0 9 0 b - p 4 4 4 3 4 2 4 1 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 r g s a r g r r g t 6 8 n f r d c 4 . 7 n f 1 0 ? 1 f v m p v l v 6 2 k ? z e a r o p e n p i n s s h o u l d b e c o n n e c t e d a s s h o w n i n f i g u r e 2 7 open i m u t x v m p i i m p s e l i m p 4 7 f 1 0 0 0 f 2 2 0 f 1 0 f i l i p d v m p v p d 1 0 f v m i m u t r v m p 1 0 0 f i m
30 U4090B-P 4741b?cord?10/03 figure 29. application circuit for loud-hearing t o s t 1 3 4 4 3 3 2 1 3 1 7 1 0 8 1 1 1 4 1 3 1 2 v t o c 3 4 9 6 3 2 r 5 2 0 1 7 1 6 1 5 l 1 1 9 m i c r o - p h o n e d t m f g e n e r a t o r 1 8 5 4 2 4 2 2 8 2 7 r e c o m i c o 3 0 2 9 2 6 1 2 2 2 2 4 2 3 2 5 3 5 3 6 4 0 4 1 3 9 3 8 3 7 s t s t n 2 ( o p t i o n ) m i c r o c o n t r o l l e r u 4 0 9 0 b - p t i p r i n g 4 3 h o o k s w i t c h e a r p e a c e l o u d - s p e a k e r r 6 c 9 q 9 r 7 v m c 8 c 7 c 6 c 5 c 4 r 4 r 3 c 3 r 2 c 2 c 1 r 1 v m r 2 8 r 2 7 r 2 0 r 1 9 c 2 1 c 2 2 c 2 0 c 1 9 c 1 8 c 1 7 r 3 1 c 1 6 c 1 5 c 1 4 r 1 7 r 1 6 v m r 1 5 r 1 4 r 1 3 r 1 2 r 1 1 v m v m c 1 2 c 1 3 c 1 1 r 9 r 1 0 r 8 c 1 0 v l v m p
31 U4090B-P 4741b?cord?10/03 figure 30. application for hands-free operation t o s t 1 3 4 4 3 3 2 1 3 1 7 1 0 8 1 1 1 4 1 3 1 2 v t o c 3 4 9 6 3 2 c 7 h o o k s w i t c h 2 0 1 7 1 6 1 5 1 9 m i c r o - p h o n e d t m f 1 8 5 4 2 4 2 2 8 2 7 r e c o l o g t x 3 0 2 9 2 6 1 2 2 2 2 4 2 3 2 5 3 5 3 6 4 0 4 1 3 9 3 8 3 7 s t n 2 ( o p t i o n ) v m m i c r o c o n t r o l l e r u 4 0 9 0 b - p t i p r i n g 4 3 b c 1 7 7 s t l o g t x l o u d s p e a k e r e a r p i e c e h f - m i c r 5 c 9 q 1 l 1 v m p r 7 r 6 v m c 8 c 6 c 5 c 4 r 4 c 3 r 3 r 2 c 2 c 1 r 1 v m r 2 6 c 2 5 r 2 5 r 2 4 c 2 4 r 2 2 r 2 3 c 2 3 c 2 1 r 3 0 r 2 9 c 2 7 c 2 6 c 1 8 c 1 7 r 1 8 c 1 6 c 1 5 c 1 4 r 1 7 r 1 6 r 1 5 r 1 4 r 1 3 r 1 2 r 1 1 v m v m c 1 2 c 1 3 c 1 1 r 1 0 r 9 r 8 c 1 0 v l v b r 2 1
32 U4090B-P 4741b?cord?10/03 table 5. typical values of external components (figure 29 and figure 30) name value name value name value name value c 1 100 nf c 16 47 f r 3 > 68 k r 18 30 k c 2 4.7 nf c 17 10 f r 4 10 k r 19 6.8 k c 3 10 f c 18 10 f r 5 1.5 k r 20 6.8 k c 4 220 f c 19 68 nf r 6 62 k r 21 15 k c 5 47 f c 20 68 nf r 7 680 k r 22 330 k c 6 470 f c 21 1 f r 8 22 k r 23 220 k c 7 820 nf c 22 100 nf r 9 330 k r 24 68 k c 8 100 f c 23 6.8 nf r 10 3 k r 25 2 k c 9 100 nf c 24 10 nf r 11 62 k r 26 3.3 k c 10 150 nf c 25 100 nf r 12 30 k r 27 18 k c 11 86 nf c 26 470 nf r 13 62 k r 28 2 k c 12 33 nf c 27 33 nf r 14 120 k r 29 1 k c 13 10 f l 1 2.2 mh r 15 47 k r 30 12 k c 14 100 nf r 1 27 k r 16 1 k r 31 56 k c 15 1 f r 2 20 k r 17 1.2 k
33 U4090B-P 4741b?cord?10/03 package information ordering information extended type number package remarks U4090B-Pfn sso44 ? U4090B-Pfng3 sso44 taped and reeled t4090b-pc die chip on foil technical drawings according to din specifications package sso44 dimensions in mm 0.25 0.10 0.3 0.8 18.05 17.80 16.8 2.35 9.15 8.65 7.50 7.30 10.50 10.20 0.25 44 23 1 22
printed on recycled paper. disclaimer: atmel corporation makes no warranty for the use of its products, other than those expressly contained in the company?s standar d warranty which is detailed in atmel?s terms and conditions located on the company?s web site. the company assumes no responsibi lity for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time wi thout notice, and does not make any commitment to update the information contained her ein. no licenses to patents or other intellectual property of atmel are granted by the company in connection with the sale of atmel produc ts, expressly or by implication. atmel?s products are not aut horized for use as critical components in life support devices or systems. atmel corporation atmel operations 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 487-2600 regional headquarters europe atmel sarl route des arsenaux 41 case postale 80 ch-1705 fribourg switzerland tel: (41) 26-426-5555 fax: (41) 26-426-5500 asia room 1219 chinachem golden plaza 77 mody road tsimshatsui east kowloon hong kong tel: (852) 2721-9778 fax: (852) 2722-1369 japan 9f, tonetsu shinkawa bldg. 1-24-8 shinkawa chuo-ku, tokyo 104-0033 japan tel: (81) 3-3523-3551 fax: (81) 3-3523-7581 memory 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 microcontrollers 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 la chantrerie bp 70602 44306 nantes cedex 3, france tel: (33) 2-40-18-18-18 fax: (33) 2-40-18-19-60 asic/assp/smart cards zone industrielle 13106 rousset cedex, france tel: (33) 4-42-53-60-00 fax: (33) 4-42-53-60-01 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 scottish enterprise technology park maxwell building east kilbride g75 0qr, scotland tel: (44) 1355-803-000 fax: (44) 1355-242-743 rf/automotive theresienstrasse 2 postfach 3535 74025 heilbronn, germany tel: (49) 71-31-67-0 fax: (49) 71-31-67-2340 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 biometrics/imaging/hi-rel mpu/ high speed converters/rf datacom avenue de rochepleine bp 123 38521 saint-egreve cedex, france tel: (33) 4-76-58-30-00 fax: (33) 4-76-58-34-80 literature requests www.atmel.com/literature 4741b?cord?10/03 ? atmel corporation 2003 . all rights reserved. atmel ? and combinations thereof are the registered tradem arks of atmel corporation or its subsidiaries. other terms and product names may be the trademarks of others.

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