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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 piez oelectric transducer complete system integration of an alog signal proc essing on one chip very few external components fewer components for emi protection monolithic integrated feature phone circuit emi improved u4090b-p rev. 4741c?cord?11/05
2 4741c?cord?11/05 u4090b-p 1. description the microcontroller-controlled telephone circuit u409 0b-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 cir- cuit 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 loud-hearing or hands-free opera- tion. with an anti-feedback function, acoustical feedback during loud-hearing can be reduced significantly. the generated supply voltage is su itable for a wide range of peripheral circuits. figure 1-1. block diagram mc with eeprom/ dtmf audio amplifier speech circuit voice switch tone ringer loudhearing and tone ringing
3 4741c?cord?11/05 u4090b-p figure 1-2. detailed block diagram gt mico txin sto vl impsel aga ind sense gnd pd lidet rfdo tha recin stis stil rac gr reco2 reco1 mutr mutx gsa mic1 mic2 dtmf ttxa inldr tldr a tafs 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 receive attenuation + - - + v mp st bal txa inldt tldt -1 900 ? + + - - 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 600 ? vb vmp vmps vm iref vring cosc swout i l q s v l
4 4741c?cord?11/05 u4090b-p 2. pin configuration figure 2-1. 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
5 4741c?cord?11/05 u4090b-p table 2-1. pin description pin symbol function 1gt a resistor from this pin to gnd sets the amplific ation 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 mic2 non-inverting input of microphone amplifier 5 mic1 inverting input of microphone amplifier 6pd active high input for reducing the current co nsumption of the circuit, simultaneously v l is shorted by an internal switch 7ind the internal equivalent inductance of the circuit is pr oportional 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 7v 12 sao output of loudspeaker amplifier 13 vmps unregulated supply voltage for micorcontroller, limited to 6.3v 14 vmp regulated supply voltage of 3.3v for peripheral circ uits (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 fo r 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 amplif ier, 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 a nd hands-free use; receive branch not affected 26 atafs attenuation of acoustical feedback suppression, maximu m 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 29 tldt time constant of transmit level detector
6 4741c?cord?11/05 u4090b-p note: filters against electromagnetic interference (emi) are locat ed at following pins: mic1, mic2, recin, txin, stis, stil and rac. 3. dc line interface and su pply-voltage generation the dc line interface consists of an electron ic 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 3-2 ) shows how a priority for supply vmps is achieved. 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 loudspeak er 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 reco2 inverting output of receiving amplifier 37 stis input for sidetone network (short loop) or for answering machine 38 stil input for sidetone network (long loop) 39 rac input of receiving amplifier for ac coupling in feedback path 40 reco1 output of receiving amplifier 41 gr a resistor connected from this pin to gnd sets the receiving amplificati on of the circuit; amplifier ra1 can be muted by applying vmp to gr 42 ttxa time constant of ant i-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 ? table 2-1. pin description (continued) pin symbol function
7 4741c?cord?11/05 u4090b-p figure 3-1. dc line interface with electronic inductance and gene ration of a regulated and an unregulated supply figure 3-2. supply capacitors cmps and cb are charged with priority on cmps - + + - + - v l 10 ? sense r sense < 5 ma 30 k ? 6.3v 3.3v 470 f 3.3v/ 2 ma 7.0v = = < 5 ma ind 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 - vmps > 200 mv vb < 6.3v charge cb (ibopt) charge cmps (impsopt) vmps < 6.3v ibopt = 0 reduce ibopt (impsopt = 0) y n y impsopt = 0 n n n y y
8 4741c?cord?11/05 u4090b-p figure 3-3. 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 3.3v suitable for a microprocessor. in s peech mode, both regulators are active because v mps and v b are charged simultaneously by the dc-line in terface. output current is 4 ma. the capac- itor at v mps is used to provide the microcomputer with sufficient power during long-line interruptions. thus, long flash pulses can be bri dged 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. 3.1 supply structure of the chip a major benefit of the chip is that it uses a very flexible supply structure which allows simple real- ization 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 vari ous functional blocks is illustrated in figure 3-3 . power supply voltage regulator voltage regulator rfd txa txacl offsa comp afs imped contr qs pd lidet lidet rfdo es impsel vb rpc 7v sai,sa sacl mic, dtmf aga, ra1, ra2 tx mute mut rec, stbal recatt 6.3v vmp vmps v lon vl vring
9 4741c?cord?11/05 u4090b-p there are four major supply states: 1. speech condition: 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 1.9v, the switches remain in their quiescent state as shown in figure 3-4 on page 10 . offsacomp disables the group listening feature (sai, sa, sacl, afs) below line currents of approximately 10 ma. 2. power down (pulse dialing): 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 condition, lidet, voltage regulators and imped contr are the only active blocks. 3. ringing: during ringing, the supply for the system is fed into v b via the ringing power converter (rpc). the only functional amplifiers are in the speaker amplifier section (sai, sa, sacl). 4. external supply: 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 transmit line interfac e txa). selecting impsel = high im pedance activates all switches at the es line. 3.2 acoustic feedback suppression acoustical feedback from the loudspeaker to t he handset microphone may cause instability in the system. the u4090b-p offers a very effici ent feedback suppression ci rcuit, which uses a modified voice switch topology. figure 3-4 on page 10 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 co mparison of the logarithmically compressed tx- and rx- envelope curve. the system configuration for group listening, whic h is realized in the u4090b-p, is illustrated in figure 3-6 on page 11 . txa and sai represent the two attenuators, the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes).
10 4741c?cord?11/05 u4090b-p figure 3-4. basic voice switch system figure 3-5. integration of the acoustic feedback suppressio n circuit into the speech circuit environment log tx att att contr log rx att handset microphone loudspeaker hybrid line - 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
11 4741c?cord?11/05 u4090b-p figure 3-6. acoustic feedback suppression by alternative control of transmit and speaker amplifier gain a detailed diagram of the afs (acoustic feedback suppression) is given in figure 3-6 . receive and transmit signals are first processed by loga rithmic rectifiers in order to produce the enve- lopes 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 3-7 on page 12 illustrates the principle relationship between speak er amplifier gain (gsa) and attenuation of afs (atafs). both parameters can be adjusted independently, but the inter- nal 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 automatical ly 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 . 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 aga tldt r ldt inldt r ldr inldr sai txa i gsa i atgsa i agafs aga gsa atafs r atafs tldr tx rx i at i atafs
12 4741c?cord?11/05 u4090b-p figure 3-7. reducing speaker amplifie r gain results in an equal reduction of afs attenuation figure 3-8. line detection with two comparators for speech mode and pulse dialing 3.3 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 amplif ier. the basic behavior is illustrated in figure 3-9 on page 13 . actual values of ilon/iloff vary slightly wi th the adjustment of the dc characteristics and the selection of the internal line impedance. when power down is activated (during pulse dia ling), the entire line current flows through the short-circuiting transistor qs (see figure 3-3 on page 8 ). as long as il is above typically 1.6 ma, output lidet is low. this comparator does not use hysteresis. atafs (db) 36 db atafs m atafs a gsa o gsa a gsa (db) not usable r atafs r atafs il pd lidet
13 4741c?cord?11/05 u4090b-p figure 3-9. line detection in speech mode with hysteresis 3.4 ringing power converter (rpc) the rpc transforms the input power at vring (high voltage/low current) into an equivalent out- put 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 con- verter is approximate 65%. figure 3-10. comparator thresholds depending on dc mask and line impedance 3.5 ringing frequency detector (rfd) the u4090b-p offers an output signal for the microcontroller, which is a digital representation 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 thresholds 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 2.0v. lidet iloff ilon il 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 ?
14 4741c?cord?11/05 u4090b-p 4. absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may 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 t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng 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 = 60c p tot 0.9 w 5. thermal resistance parameters symbol value unit junction ambient sso44 r thja 70 k/w 6. 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
15 4741c?cord?11/05 u4090b-p 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 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 71013db 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 +60c ? 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 r o 10 ? line loss compensation r aga = 20 k ? , i l = 100 ma ? g ri ?7.0 ?6.0 ?5.0 db 6. 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 4741c?cord?11/05 u4090b-p 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 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 37 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 +60c 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% 6. 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 4741c?cord?11/05 u4090b-p 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 +60c v mp i l = 14 ma rdc = 68 k ? i mp = 2 ma v mp 3.1 3.3 3.5 v v mps i l = 100 ma rdc = infinite i mp = 0 ma v mps 6.7 v v m i l 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 77.6v ringing power converter, imp = 1 ma, im = 0 maximum output power v ring = 20.6v 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 = 30v r ring 456k ? 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 ? logic level of frequency detector v ring = 0v v b = 4v v ring = 25v v rfdo 0 v mp v ring detector enable v ring = 25v, 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 ? 0.3v v 6. 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
18 4741c?cord?11/05 u4090b-p pd input pd input current pd active, i l > 14 ma v pd = v mp i pd 9a 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 ? 0.3v 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 input voltage input high v mutx v mp ? 0.3v 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 = 5v, pd = active ilonpd 0.8 1.6 2.4 ma 6. 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
19 4741c?cord?11/05 u4090b-p 7. u4090b-p control table 7-1. 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 7-2. 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 table 7-3. 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
20 4741c?cord?11/05 u4090b-p 8. 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 figure 8-1. typical dc characteristic figure 8-2. typical adjustment range of transmit gain table 7-4. specification of logic levels logic level 0 = < (0.3v) z = > (1v) < (vmp ? 1v) or (open input) 1 = > (vmp ? 0.3v) 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)
21 4741c?cord?11/05 u4090b-p figure 8-3. typical adjustment range of rece ive gain (differential output) figure 8-4. typical aga characteristic figure 8-5. typical load characteristic of v b for a maximum (rdc = infinity) dc-characteristic and 3-mw loudspeaker output -4 -2 0 2 4 6 8 10 0 1020 30 40 5060 7080 rgr (k ? ) gr (db) -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
22 4741c?cord?11/05 u4090b-p figure 8-6. typical load characteristic of v b for a medium dc-characteristic (rdc = 130 k ? ) and 3-mw loudspeaker output figure 8-7. 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 1012141618 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
23 4741c?cord?11/05 u4090b-p figure 8-8. basic test circuit 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 open mico open open v mp 220 nf 150 nf v l v mp 47 nf 47 nf i m 3.3 nf 3.3 nf 2 m ? rgr rgt 68 nf rdc 600 ? 4.7 nf s1 i l bc556 2.2 mh sd103a dc v ring 68 nf s2 1 f 10 f rgsa vm reference figure for not connected pins s1 = closed: speech mode s2 = closed: rin g er mode zear 10 f 62 k ? 100 f v mp v m 3 k ? 10 f 1 f 1 k ? 10 f 22 f 10 ? 47 f 1000 f 50 ? 220 f 47 f i dc i mp 680 k ? v m v m 3 k ? 36 k ? 36 k ?
24 4741c?cord?11/05 u4090b-p figure 8-9. test circuit for dc characteristics and line detection 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 mico i m v 220 nf 150 nf rgr 100 f raga 30 k ? dc rgt 68 nf rdc 4.7 nf 10 v b s1 b a open 1000 f 1 mf v rgsa line detection: s1a vb (external supply): s1b open pins should be connected as shown in figure 8-14 zear v lidet 62 k ? 10 f v m v l 1 f v mic v mp 10 f i l v l i b 220 f 47 f i mp
25 4741c?cord?11/05 u4090b-p figure 8-10. test circuit for transmission amplifier input resistance: ri = 50 k vl (s2 = closed) vl (s2 = open) - 1 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 vcm vl + gt with s1b, s2 = closed, s3 = open mute suppression: gtm = 20 log vl (at mutx = low) vl (at mutx = open) gttx = 20 log vl (at impsel = low) vl (at impsel = open) open pins should be connected as shown in figure 8-14 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 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 mp 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 vmico max v mp v m 1 f i m 100 f 25 k ? 25 k ? 600 22 f 10 ? 1000 f 47 f i mp v mp
26 4741c?cord?11/05 u4090b-p figure 8-11. test circuit for receiving amplifier 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 mico v 220 nf 150 nf rgr 100 f 62 k raga rgt 68 nf rdc 1 f open open 220 nf v s2 4.7 nf v mp open s1 a b ac 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) dt mf operation: ? gr = 20 log vlr/vzear) db + gr, mutx = vmp o p en p ins should be connected as shown in fi g ure 8-14 zear vzear, dr s3 v mp i m v mp v m 10 f 1 f v l v m 1 k ? v dtmf 10 f 600 ? 22 f v gen i l 10 220 f 1000 f v lr 47 f i mp
27 4741c?cord?11/05 u4090b-p figure 8-12. test circuit for speaker amplifier 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 mico v mic v 220 nf 150 nf rgr 10 f rgsa 30 k ? rgt 68 nf rdc 4.7 nf off s4 vatafs 20 k ? 220 nf v s1 v 10 f zear v sai vsao, s4 = closed vzin, s4 = open n sa 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 8-14 v i inldt i inldr 10 f 62 k ? v m 1 f 1 f v lidet i mp 47 f 1000 f 47 f 220 f 22 f 50 ? 600 ? 10 ? i l 10 f v l
28 4741c?cord?11/05 u4090b-p figure 8-13. test circuit for dtmf amplifier 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 mico v l i m v 220 nf 150 nf rgr 100 f 62 k ? rgt 68 nf v m rdc i l 1 f v mp 220 nf v s3 4.7 nf open ac zear dtmf-amplifier: 20log (vl/vdtmf) db input resistance: (vl50k/(vl - vl50k)) 50 k ? open pins should be connected as shown in figure 8-14 vl: s3 = closed vl 50 k ? : s3 = open d d 10 f v m 1 f v gen3 50 k ? 1 k ? v dtmf 10 f 10 ? 220 f 1000 f 47 f i mp
29 4741c?cord?11/05 u4090b-p figure 8-14. 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 2v to 22v (vringon) and back again (vringoff) (s2 = closed) 5) ring detector enable: detecting vrfdo, when driving vmp from 0.7v to 3.3v (vmpon) and back again (vmpoff) (s5, s3 = closed) open pins should be connected as shown in figure 8-14 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 1.5v 20v ramp 20.6v 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 = =
30 4741c?cord?11/05 u4090b-p figure 8-15. test circuit for input characteristics of i/o ports 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 rgsa rgr rgt 68 nf rdc 4.7 nf 10 ? 1 f v mp v l v 62 k ? zear open pins should be connected as shown in figure 8-14 open i mutx v mp i impsel i mp 47 f 1000 f 220 f 10 f i l i pd v mp v pd 10 f v m i mutr v mp 100 f i m
31 4741c?cord?11/05 u4090b-p figure 8-16. application circuit for loud-hearing to st 1 3 44 33 21 31 7 10 8 11 14 13 12v to c 34 9 6 32 r 5 20 17 16 15 l 1 19 micro- phone dtmf g enerator 18 5 4 2 42 28 27 reco mico 30 29 26 12 22 24 23 25 35 36 40 41 39 38 37 st stn 2 (option) micro controller u4090b-p tip ring 43 hook switch earpeace loud- s peaker 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 m r 28 r 27 r 20 r 19 c 21 c 22 c 20 c 19 c 18 c 17 r 31 c 16 c 15 c 14 r 17 r 16 v m r 15 r 14 r 13 r 12 r 11 v m v m c 12 c 13 c 11 r 9 r 10 r 8 c 10 v l v mp
32 4741c?cord?11/05 u4090b-p figure 8-17. application for hands-free operation to st 1 3 44 33 21 31 7 10 8 11 14 13 12v to c 34 9 6 32 c 7 hook switch 20 17 16 15 19 micro- phone dtmf 18 5 4 2 42 28 27 reco logtx 30 29 26 12 22 24 23 25 35 36 40 41 39 38 37 stn 2 (option) v m microcontroller u4090b-p tip ring 43 bc177 st logtx loud speaker earpiece hf-mic r 5 c 9 q 1 l 1 v mp 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 26 c 25 r 25 r 24 c 24 r 22 r 23 c 23 c 21 r 30 r 29 c 27 c 26 c 18 c 17 r 18 c 16 c 15 c 14 r 17 r 16 r 15 r 14 r 13 r 12 r 11 v m v m c 12 c 13 c 11 r 10 r 9 r 8 c 10 v l v b r 21
33 4741c?cord?11/05 u4090b-p table 8-1. typical values of external components ( figure 8-16 on page 31 and figure 8-17 on page 32 ) 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 ?
34 4741c?cord?11/05 u4090b-p 10. package information 9. ordering information extended type number package remarks U4090B-PFNY sso44 pb-free u4090b-pfng3y sso44 taped and reeled, pb-free 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
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