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u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 1 (34) monolithic integrated feature phone circuit description the m c controlled telephone circuit u4090b 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 necessary for amplification of signals and adaptation to the line. an integrated voice switch with loudspeaker amplifier allows loudhearing or handsfree operation. with an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. the generated supply voltage is suitable for a wide range of peripheral circuits. 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 loudhearing 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 loudhearing 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 benefits savings of one piezo electric transducer complete system integration of analog signal proces- sing on one chip very few external components applications feature phone, answering machine, fax machine, speaker phone mc with eeprom/ dtmf audio amplifier speech circuit voice switch tone ringer loudhearing and tone ringing 94 8741
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 2 (34) block diagram gt mico txin sto v l impsel aga ind sense v b v mp v mps v m gnd pd i ref lidet v ring c osc sw out rfdo tha recin stis stil rac gr reco2 reco1 mutr mutx gsa mic1 mic2 dtmf ttxa inldr tldr atafs sao tsacl sai mic tx acl acoustical feedback suppression control transmit mute control sacl mute receive control impedance control power supply current supply i supply line detect aga control i l receive attenuation v l + + v mp st bal txa 94 8064 q s inldt tldt 1 600 900 + + 1 2 6 4 12 5 7 8 9 11 10 3 16 15 23 22 24 25 26 20 27 21 19 14 13 28 31 30 29 38 37 36 33 35 34 32 42 39 41 40 43 44 17 18 dtmf ra1 ra2 sa sai figure 1.
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 3 (34) r 1 c 1 to stin 1 3 44 33 r 2 21 31 7 r 3 r 4 10 8 c 4 c 5 c 6 11 14 13 13 v to c c 8 v m 34 9 r 6 6 32 c 7 r 5 20 17 16 15 c 9 l 1 q 1 19 r 7 micro phone r 28 c 2 r 27 c 22 dtmf generator 18 5 4 2 42 c 21 28 27 r 20 r 19 c 20 c 19 reco mico 30 29 c 18 c 17 26 r 31 c 16 12 22 c 15 24 c 14 r 14 r 13 23 25 35 r 11 36 40 41 39 c 13 r 10 38 r 9 r 8 37 v m sto stin 2 (option) c 12 c 11 c 10 v l r 15 r 16 r 17 micro controller v mp 94 8849 u4090b tip ring 43 hook switch v m v m v m earpeace loud- speaker r 12 c 3 figure 2. application circuit for loudhearing
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 4 (34) r 1 c 1 to stin 1 3 44 33 r 2 21 31 7 r 3 r 4 10 8 c 4 c 5 c 6 11 14 13 13 v to c c 8 v m 34 9 r 6 6 32 c 7 hook switch r 5 20 17 16 15 c 9 l 1 q 1 19 r 7 micro phone r 26 c 2 v m r 25 c 23 dtmf 18 5 4 2 42 c 21 28 27 r 30 r 29 c 27 c 26 reco logtx 30 29 26 c 16 12 22 c 15 24 c 14 r 14 r 12 23 25 35 r 11 36 40 41 39 c 13 r 10 v m 38 r 9 r 8 37 v m stin 2 (option) c 12 c 11 c 10 v l v m r 15 r 16 r 17 micro controller v mp 94 8850 u4090b tip ring 43 bc177 stn logtx loud speaker earpiece r 24 r 23 r 22 r 18 r 13 r 21 c 25 c 24 c 18 c 17 c 3 v b hfmic figure 3. application for handsfree operation
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 5 (34) typical value of external components c 1 100 nf c 2 4.7 nf c 3 10 f c 4 220 f c 5 47 f c 6 470 f c 7 820 nf c 8 100 f c 9 100 nf c 10 150 nf c 11 68 nf c 12 33 nf c 13 10 f c 14 100 nf c 15 f c 16 47 f c 17 10 f c 18 f c 19 68 nf c 20 68 nf c 21 1 f c 22 100 nf c 23 6.8 nf c 24 10 nf c 25 100 nf c 26 470 nf c 27 33 nf l 1 2.2 mh r 1 27 k r 2 20 k r 3 > 68 k r 4 10 r 5 1.5 k r 6 62 k r 7 680 k r 8 22 k r 9 330 r 10 3 k r 11 62 k r 12 30 k r 13 62 k r 14 120 k r 15 47 k r 16 1 k r 17 1.2 r 18 30 k r 19 6.8 k r 20 6.8 k r 21 15 k r 22 330 k r 23 220 k r 24 68 k r 25 2 k r 26 3.3 k r 27 18 k r 28 2 k r 29 1 k r 30 12 k r 31 56 k
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 6 (34) 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 g t v l v b v mps g r v m 94 7905 e v mp pin description pin symbol function 1 g t a resistor from this pin to gnd sets the amplification of 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 handsfree input 3 mico output of microphone preamplifier 4 mic 2 non-inverting input of microphone amplifier 5 mic 1 inverting input of microphone amplifier 6 pd active high input for reducing the current consumption of the circuit, simultaneously v l is shorted by an internal switch 7 ind 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 v l 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 v b unregulated supply voltage for peripheral circuits (voice switch), limited to typically 7 v 12 sao output of loudspeaker amplifier 13 v mps unregulated supply voltage for m p, limited to 6.3 v 14 v mp regulated supply voltage 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
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 7 (34) pin symbol function 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 imp- sel control input for selection of line impedance 1. 600 w 2. 900 w 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 w, the speaker amplifier is switched off 24 sa i speaker amplifier input (for loudspeaker, tone ringer and handsfree 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 handsfree 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 28 inldr input of receive level detector pin symbol function 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 max. gain change: 6 db. 32 iref internal reference current generation; rref = 62 k w ; iref = 20 m a 33 sto side tone reduction output output resistance is approx. 300 w , maximum load impedance: 10 k w. 34 v m reference node for microphone- earphone and loudspeaker amplifier, supply for electret microphone (im 700 a) 35 mutr three state mute input 1. normal operation 2. mute of ear piece 3. mute of recin signal condition of earpiece mute is stored 36 reco 2 inverting output of receiving amplifier 37 sti s input for side tone network (short loop) or for answering machine 38 sti l input for side tone network (long loop) 39 rac input of receiving amplifier for ac coupling in feedback path 40 reco 1 output of receiving amplifier 41 g r 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 anticlipping 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 w
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 8 (34) 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 supply v mps is achieved. + + + v l 10 sense r sense c ind 10 f i bopt < 5 ma i mpsopt 30 k v offs 6.3 v 3.3 v v mps v mp v b 470 f 47 f 220 f 3.3 v/ 2 ma 7.0 v 94 8047 = = < 5 ma ind r dc r 30 figure 4. dc line interface with electronic inductance and generation of a regulated and an unregulated supply vsensevb>200 mv vsensevmps>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 94 8058 figure 5. supply capacitors cmps and cb are charged with priority on cmps
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 9 (34) the u4090b 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 current 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 a 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 max. 2 ma. supply structure of the chip as a major benefit the chip uses a very flexible system structure, which allows simple realization of numerous applications such as: group listening phone handsfree 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. power supply voltage regulator voltage regulator rfd txa txacl offsa comp afs imped contr v ring qs v l pd lidet lidet v lon rfdo es impsel v mps v b v mp rpc 94 8046 7 v sai,sa sacl mic, dtmf aga, ra1, ra2 tx mute mut rec, stbal recatt 6.3 v figure 6. supply of functional blocks is controlled by input voltages v l , v b , v ring and by logic inputs pd and impsel there are four major supply states: 1. speech condition 2. power down (pulse dialing) 3. ringing 4. external supply 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. for line voltages below 1.9 v the switches remain in their quiescent state as shown the diagram. offsacomp disables the group listening feature (sai, sa, sacl, afs) below line currents of approximately 10 ma. 2. when the chip is put into 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 condition lidet, voltage regulators and imped contr are the only active blocks.
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 10 (34) 3. during ringing the supply for the system is fed into v b via the ringing power converter (rpc). the only functional amplifiers are found 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 demands a posibility to activate all amplifiers (except the transmit line interface txa). selecting imp- sel = high impedance activates all switches at the es line. acoustic feedback suppression acoustical feedback from the loudspeaker to the handset microphone may cause instability in the system. the u4090b offers a very efficient feedback suppression circuit, which uses a modified voice switch topology. figure 8 shows the basic system configuration. log tx att att contr log rx att handset microphone loudspeaker hybrid line 94 8956 figure 5. basic voice switch system 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, wether 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 compressed tx- and rx- envelope curve. the system configuration for group listening, which is realized in the u 4090 b, is illustrated in figure 9. txa and sai represent the two attenuators, whereas the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes).
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 11 (34) 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 94 8059 inldr vl figure 6. integration of acoustic feedback suppression circuit into the speech circuit environment a detailed diagram of the afs (acountic feedback suppression) is given in figure 10. receive and transmit signals are first processed by logorithmic rectifiers in order to produce the envelopes of the speech at tldt and rldt. after amplification a decision is made by the differential pair, which direction should be transmitted.
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 12 (34) aga tldt rldt inldt rldr inldr sai txa igsa iatgsa iagafs aga gsa atafs ratafs tldr 94 8060 tx rx i at i ata f s figure 7. accoustic feedback suppression by alternative control of transmit- and speaker amplifier gain the attenuation of the controlled amplifiers txa and sai is determined by the emitter current iat, which is com- prised of three parts: i ata s sets maximum attenuation i at g s a 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 i at = i ata f s - i at g s a - i agafs g = i at * 0.67 db/ a figure 11 illustrates the principal 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. 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 .
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 13 (34) atafs (db) 36 db atafs m atafs a gsa o gsa a gsa (db) not usable ratafs ratafs 94 8957 figure 8. reducing speaker amplifier gain results in an equal reduction of afs attenuation il pd lidet 94 8958 figure 9. line detection with two comparators for speech mode and pulse dialling line detection (lidet) the line current supervision is active under all operating conditions of the u4090b. 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 behaviour is illustrated in figure 13. 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), all of the line current flows through the short circuiting transistor qs (see figure 6). as long as il is above typ. 1.6 ma, output lidet is low. this comparator does not use hysteresis. lidet iloff ilon il 94 8959 figure 10. line detection in speech mode with hysteresis
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 14 (34) ringing power converter (rpc) rpc transforms the input power at vring (high voltage/ low current) into an equivalent 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 approx. 65%. 10 12 14 16 18 3 4 5 6 7 v ( v ) l i l ( ma ) 20 94 9131 r dc =68k r dc =130k r dc = = ilon = iloff at line impedance = 900 = ilon = iloff at line impedance = 600 figure 11. comparator thresholds depend on dc mask and line impedance ringing frequency detector (rfd) the u4090b offers an output signal for the micro- controller, which is a digital representation of the double ringing frequency. it is generated by a current comparator with hysteresis. input voltage vring is transformed into a current via rtha. thresholds are 8 a and 24 a. rfdo and vring 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. absolute maximum ratings 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 c p tot 0.9 w
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 15 (34) thermal resistance parameters symbol value unit junction ambient sso44 r thja 70 k/w electrical characteristics f = 1 khz, 0 dbm = 775 mv rms , i m = 0.3 ma, i mp = 2 ma, rdc = 130 k , t amb = 25 c, 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 / pin symbol min typ max unit figure 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 26 transmission amplifier, i l = 14 ma, v mic = 2 mv, rgt = 27 k , unless otherwise specified adjustment range of trans- mit gain g t 40 45 50 db 28 transmitting amplification rgt = 12 k rgt = 27 k g t 47 39.8 48 49 41.8 db 28 frequency response i l 14 ma, f = 300 to 3400 hz g t 0.5 db 28 gain change with current pin 31 open i l = 14 to 100 ma g t 0.5 db 28 gain deviation t amb = 10 to + 60 c g t 0.5 db 28 cmrr of microphone amplifier cmrr 60 80 db 28 input resistance of mic amplifier rgt = 12 k rgt = 27 k r i 45 50 75 110 k 28 distortion at line i l > 14 ma v l = 700 mvrms d t 2 % 28 maximum output voltage i l > 19 ma d < 5% vmic = 25 mv ctxa = 1 f v lmax 1.8 3 4.2 dbm 28 impsel = open rgt = 12 k v micomax 5.2 dbm 28 noise at line psophomet- rically weighted i l > 14 ma g t = 48 db no 80 72 dbmp 28 anti-clipping attack time release time ctxa = 1 f each 3 db overdrive 0.5 9 ms gain at low operating cur- rent i l = 10 ma i mp = 1 ma rdc = 68 k vmic = 1 mv i m = 300 a g t 40 42.5 db 28
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 16 (34) parameters test conditions / pin symbol min typ max unit figure distortion at low operating current i l = 10 ma i m = 300 a i mp = 1 ma rdc = 68 k vmic = 10 mv d t 5 % 28 line loss compensation i l = 100 ma, raga = 20 k g ti 6.4 5.8 5.2 db 28 mute suppression a) mic muted (microphone preamplifier i l 14 ma mutx = open g tm 60 80 db 28 b) txa muted (second stage) impsel = open g ttx 60 db 28 receiving amplifier, i l = 14 ma, rgr = 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 27 receiving amplification rgr = 62 k differential rgr = 22 k differential g r 1.75 1 7.5 0.25 db 27 amplification of dtmf sig- nal from dtmf in to reco 1, 2 i l 14 ma v mutx = v mp g rm 7 10 13 db 27 frequency response i l > 14 ma, f = 300 to 3400 hz g rf 0.5 db 27 gain change with current i l = 14 to 100 ma g r 0.5 db 27 gain deviation t amb = 10 to + 60 c g r 0.5 db 27 ear protection differential i l 14 ma vgen = 11 vrms ep 2.2 vrms 27 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 27 output voltage d 2% differential i l = 14 ma z ear = 68 nf + 100 0.775 vrms 27 maximum output current d 2% z ear = 100 4 ma (peak) 27 receiving noise psophometrically weigthed z ear = 68 nf + 100 i l 14 ma ni 80 77 dbmp 27 output resistance each output against gnd ro 10 line loss compensation raga = 20 k i l = 100 ma g ri 7.0 6.0 5.0 db 27 gain at low operating cur- rent 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 27
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 17 (34) parameters test conditions / pin symbol min typ max unit figure ac impedance v impsel = gnd v impsel = v mp z imp z imp 570 840 600 900 640 960 27 distortion at low operating current i l = 10 ma i mp = 1 ma v gen = 560 mv rdc = 68 k dr 5 % 27 speaker amplifier minimum line current for operation no ac signal i lmin 15 ma 31 input resistance pin 24 14 22 k 31 gain from sai to sao v sai = 3 mv, i l = 15 ma, rgsa = 560 k rgsa = 20 k g sa 35.5 36.5 3 37.5 db 31 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 31 output noise (input sai open) psophometrically weighted i l > 15 ma n sa 200 v psoph 31 gain deviation i l = 15 ma t amb = 10 to + 60 c g sa 1 db 31 mute suppression i l = 15 ma, v l = 0 dbm, v sai = 4 mv pin 23 open vsao 60 dbm 31 gain change with current i l = 15 to 100 ma g sa 1 db 31 resistor for turning off speaker amplifier i l = 15 to 100 ma rg sa 0.8 1.3 2 m 31 gain change with frequency i l = 15 ma f = 300 to 3400 hz g sa 0.5 db 31 attack time of anti-clipping 20 db over drive tr 5 ms 31 release time of anti-clip- ping tf 80 ms 31 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 29 dtmf amplification i l = 15 ma, vdtmf = 8 mv mute active: mutx = vmp g d 40.7 41.7 42.7 db 29 gain deviaton i l = 15 ma t amb = 10 to + 60 c g d 0.5 db 29
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 18 (34) parameters test conditions / pin symbol min typ max unit figure input resistance rgt = 27 k , rgt = 15 k r i 60 26 180 70 300 130 k 29 distortion of dtmf signal i l 15 ma v l = 0 dbm d d 2 % 29 gain deviation with current i l = 15 to 100 ma gd 0.5 db 29 afs acousting feedback suppression adjustment range of attenuation i l 15 ma 0 50 db 31 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 31 attenuation of speaker amplifier i l 15 ma i inldp = 0 r ata f s = 30 k i inldr = 10 g sa 50 db 31 afs disable i l 15 ma v ata f s 1.5 v 31 supply voltages, vmic = 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 26 v mps i l = 100 ma rdc = inf., i mp = 0 ma v mps 6.7 v 26 v m i l 14 ma, i m = 700 a rdc = 130 k v m 1.3 3.3 v 26 v b i b = + 20 ma, i l = 0 ma v b 7 7.6 v 26 ringing power converter, imp = 1 ma, im = 0 maximum output power v ring = 20.6 v p sa 20 mw 30 threshold of ring frequency detector rfdo: low to high v hyst = v ring on - ring off v ringon vhyst 17.5 11.0 v 30 input impedance v ring = 30 v r ring 4 5 6 k 30 input impedance in speech mode f = 300 hz to 3400 hz i l > 15 ma, v ring = 20v + 1.5v rms r ringsp 150 k 30 logic-level of frequency detector v ring = 0 v v b = 4 v v ring = 25 v v rfdo 0 vmp v 30 ring detector enable v ring = 25 v, rfdo high vmpon 1.8 2.0 2.2 v 30 zener diode voltage i ring = 25 ma v ringmax 30.8 33.3 v 30
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 19 (34) parameters test conditions / pin symbol min typ max unit figure mutr input mutr input current vmutr = gnd i l > 14 ma vmutr = v mp i mute 20 +10 30 a 32 mutr input voltage mute low; i l > 14 ma v mute 0.3 v 32 mutr i npu t vo lt age mute high; i l > 14 ma v mute vmp-0.3 v v 32 pd input pd input current pd active, i l > 14 ma v pd = v mp ipd 9 ua 32 input voltage pd = active pd = inactive v pd v pd 2 0.3 v 32 voltage drop at v l i l = 14 ma, pd = active i l = 100 ma, pd = active v l v l 1.5 1.9 v 32 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 32 in p ut volta g e input high v impsel vmp-0.3 v v 32 input voltage input low v impsel 0.3 v 32 mutx input input current v mutx = v mp v mutx = gnd i mutx i mutx 20 20 30 30 a a 32 in p ut volta g e input high v mutx vmp-0.3 v v 32 input voltage input low v mutx 0.3 v 32 line detection line current for lidet active pd = inactive ilon 12.6 ma 26 line current for lidet inactive pd = inactive iloff 11.0 ma 26 current threshold during power down v b = 5 v, pd = ac- tive ilonpd 0.8 1.6 2.4 ma 26
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 20 (34) u 4090 b - control 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 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 + ear- peace mute 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 logic-level 0 = < (0.3 v) z = > (1 v) < (vmp 1 v) or (open input) 1 = > (vmp 0.3 v) recatt = receive attenuation stis, stil = inputs of sidetone balancing amplifiers es = external supply afs = acoustical feedback supression control aga = automatic gain adjustment ra2 = inverting receive amplifier txacl = transmit anticlipping control
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 21 (34) 94 8856 figure 12. typical dc characteristic 94 8860 g t (db) rgt (kohm) figure 13. typical adjustment range of transmit gain
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 22 (34) 94 8859 figure 14. typical adjustment range of receive gain (differential output) 948855 figure 15. typical aga-characteristic
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 23 (34) 94 8858 figure 16. typical load characteristic of v b for a maximum (rdc = infinity) dc-characteristic and 3 mw loudspeaker output 94 8874 figure 17. typical load characteristic of v b for a medium dc-characteristic (rdc = 130 k ) and 3 mw loudspeaker output
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 24 (34) 94 8861 figure 18. typical load characteristic of v b for a minimum dc-characteristic (rdc = 68 k ) and 3 mw loudspeaker output
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 25 (34) u4090b 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 open mico open open 94 9132 v mp 220 nf 150 nf 1 f v l v m v mp 10 f 3 k 47 nf 47 nf 36 k i m 62 k 3.3 nf 3.3 nf 2 m rgr rgt 1 k 68 nf rdc 600 4.7 nf 22 f s1 i l 1000 f 47 f 50 bc556 2.2 mh 220 f sd103a dc v ring 68 nf s2 1 f 680 k v m v m 3 k 36 k 100 f 10 f 10 f rgsa i dc i mp 47 f 10 10 f vm reference figure for not connected pins s1 = closed: speech mode s2 = closed: ringer mode zear v mp figure 19. basic test circuit
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 26 (34) u4090b 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 94 9133 v l v m v mic i m v 220 nf 150 nf 1 f rgr 10 f 100 f 62 k raga 30 k dc rgt 68 nf v mp rdc 10 f i l 4.7 nf 10 i b v b s1 b a open 220 f 1000 f 1 f i mp v 47 f rgsa line detection: s1a vb (external supply): s1b open pins should be connected as shown in figure 25 zear v lidet v l figure 20. dc characteristics, line detection
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 27 (34) u4090b 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 94 9134 v l v m i m v 220 nf 150 nf 1 f rgr 10 f 100 f 62 k raga rgt 68 nf v m rdc 10 i l 220 f 1000 f 1 f i mp open v mp open v mp 220 nf 1 k v s2 600 4.7 nf v mp open v gen 22 f s1 a b ac 10 f 47 f line loss compensation: gri = gr (at il = 100 ma) gr (at il = 14 ma), s3 = closed receiving noise: s1a receive amplification: gr = 20*log ( vzear/vlr) db (s1 = b, s2 open) dtmf-control signal: grm = 20*log (vzear/vdtmf) db (s1 =a, s2 = closed) ac-impedance: (vlr/ (vgen vlr)) * zl mute suppression: a) recatt: gr = 20*log (vlr/vzear) db +gr, mutr = open b) ra2: gr = 20*log (vlr/vzear) db + gr, mutr = vmp c) dtmf operation: gr = 20*log vlr/vzear) db + gr, mutx = vmp open pins should be connected as shown in figure 25 zear v lr vzear, dr s3 v dtmf figure 21.
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 28 (34) input resistance: ri = u4090b 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 94 9135 v l v m i m v 220 nf 150 nf 1 f rgr 10 f 100 f 62 k raga rgt 68 nf rdc 10 f 10 i l 220 f 1000 f 1 f i mp open v mp open v mp 600 4.7 nf 22 f ac s3 s1 b s2 s1 25 k 25 k a b a open v mp 1 f 47 f zear transmitting amplification gt = 20*log vl vmic line loss compensation: gti = gt (at il = 100 ma) gt (at il = 14 ma), s3 = closed gain change with current: gti = gt (at il = 100 ma) gt (at il = 14 ma) common mode rejection ratio: cmrr = 20*log + gt with s1b, s2 = closed, mute suppression: gtm = 20*log gttx = 20*log open pins should be connected as shown in figure 25 vcm vl vl (at mutx = low) vl (at mutx = open) vl (at impsel = low) vl (at impsel = open) 50 k vl (s2 = closed) vl (s2 = open) s3 = open rdc vl, dt, n o v mic v cm 1 vmico max v figure 22. transmission amplifier
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 29 (34) u4090b 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 94 9136 v l v m i m v 220 nf 150 nf 1 f rgr 10 f 100 f 62 k rgt 68 nf v m rdc 10 f 47 f 10 i l 220 f 1000 f 1 f i mp v mp 220 nf 50 k v s3 4.7 nf open v gen3 ac 1 k zear dtmf-amplifier: 20log (vl/vdtmf) db input resistance: (vl50k / (vl vl50k)) * 50k open pins should be connected as shown in figure 25 v dtmf vl: s3 = closed vl 50k : s3 = open d d figure 23. dtmf amplifier
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 30 (34) iring vring vsao 2 rsao iring vring u4090b 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 94 9138 v sai 100 f 62 k rgsa 68 nf rdc 10 f 4.7 nf 10 i l 47 f 1000 f 47 f 50 i mp bc556 2.2 mh 220 f sd103a 68 nf s5 1 f 680 k v sao 100 nf 1.8 v pp 1 khz ramp v v ring v mp v v rfdo v ring i ring 1.5 v 20 v ramp i ring 20.6 v dc dc dc s1 s2 s3 s4 1) max. output power: psa = (s4 closed) 2) threshold of ringing frequency detector: detecting vrfdo, when driving vring from 2 v to 22 v (vringon) and back again (vringoff) (s2 = closed) 3) input impedance: rring = (s3 = closed) 4) input impedance in speech mode (il > 15 ma): rringsp = (s1 = 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 25 figure 24. ringing power converter
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 31 (34) u4090b 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 94 9137 v m v mic i inldr v 220 nf 150 nf 1 f rgr 10 f rgsa 30 k rgt 68 nf rdc 4.7 nf 10 220 f 1000 f i mp 47 f i inldt off s4 vatafs 20 k 220 nf v s1 v 22 f 600 i l 50 10 f 10 f 10 f 1 f 47 f zear 62 k v sai vsao, s4 = closed vzin, s4 = open n sa v l input impedance: (vzin/(vsao vzin)) * rin gain from sai to sao: 20*log (vsao / vsai) db output power: psa = vsao 2 rsao attenuation of transmit gain: s1 = closed open pins should be connected as shown in figure 25 v v lidet figure 25. speaker amplifier
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 32 (34) u4090b 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 94 9139 v m 10 f i m 100 f rgsa rgr rgt 68 nf rdc 4.7 nf 10 i l 1000 f 47 f i mp 1 f i mutr v mp i mutx v mp i pd v mp v pd v l v 220 f v mp i impsel 62 k 10 f zear open pins should be connected as shown in figure 25 open figure 26. input characteristics of io-ports
u4090b preliminary information telefunken semiconductors rev. c1, 28-oct-96 33 (34) ordering information type package u4090b-fn sso44 dimensions in mm package: sso44 94 8888
u4090b telefunken semiconductors rev. c1, 28-oct-96 preliminary information 34 (34) ozone depleting substances policy statement it is the policy of temic telefunken microelectronic gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( odss). the montreal protocol ( 1987) and its london amendments ( 1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. temic telefunken microelectronic gmbh semiconductor division has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2 . class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency ( epa ) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c ( transitional substances ) respectively. temic can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. we reserve the right to make changes to improve technical design and may do so without further notice . parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use temic products for any unintended or unauthorized application, the buyer shall indemnify temic against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. temic telefunken microelectronic gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 ( 0 ) 7131 67 2831, fax number: 49 ( 0 ) 7131 67 2423

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