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features ? dc characteristic adjustable ? transmit and receive gain adjustable ? symmetrical input of microphone amplifier ? an ti-cl ip pi ng in tr ansmi t d ir ectio n ? automatic line-loss compensation ? symmetrical output of earpiece amplifier ? bu il t-in ear pro tectio n ? dt mf an d mu te in pu t ? adjustable sidetone suppression independent of sending and receiving amplification ? speech circuit with two sidetone networks ? bu il t-in l in e d etectio n ci rcui t ? 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 c omp on ents fo r emi pr otecti on monolithic integrated feature phone circuit emi improved u4090b-p 4741d?cord?01/10
2 4741d?cord?01/10 u4090b-p 1. 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 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 suitable 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 4741d?cord?01/10 u4090b-p figure 1-2. detailed block di agram 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 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 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 4741d?cord?01/10 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 4741d?cord?01/10 u4090b-p ta ble 2- 1. pin descripti on pi n symbo l f un ctio n 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 mic2 non-inverting input of microphone amplifier 5 mic1 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 propor tional 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 character istic 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 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 (answer ing 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 logar ithmical, or rgsa > 2 m , the speaker amplifier is switched off 24 sa i speaker amplifier input (for loudspeaker, tone r inger 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 par t of the input signal is passed to the receiving amplifier as a confidence signal during dialing 3. input dtmf used for answer ing 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 28 inldr input of receive level detector 29 tldt time constant of transmit level detector
6 4741d?cord?01/10 u4090b-p note: filters against electromagnetic interference (emi) are located at following pins: mic1, mic2, recin, txin, stis, stil and rac. 3. 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 an d v b . th e va lue of the eq uiva le nt in ductan ce is given by: l = r sense c in d ((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 vm ps is ach ie ved . 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 star ting 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. m ute for r eci n signal condition of earpiece mute is stored 36 reco2 inverting output of receiving amplifier 37 stis input for sidetone network (shor t 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 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 ta ble 2- 1. pin description (continued) pi n symbo l f un ctio n
7 4741d?cord?01/10 u4090b-p figure 3-1. dc li ne in terfa ce wi th el ectro ni c in du ctan ce a nd ge ne ra tion of a re gu la ted a n d an unreg ulated suppl y 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 4741d?cord?01/10 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 th e u 40 9 0b- p c on tai ns tw o id en tica l se ri es re gu la to rs w hi ch p r ovi de a su pp ly v ol tag e v mp of 3.3v suitable for a microprocessor. in speech mode, both regulators are active because v mps an d v b are charged simultaneously by the dc-line interface. 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 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 m a. 3. 1 supp ly structure of th e ch ip 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: ? gro up listen in g p ho ne ? hands-free phone ? ri ng ing with th e bu ilt in sp e ake r am pli fi er ? answering machine with external supply the special supply topology for the various 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 4741d?cord?01/10 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 a ctivate d, th us sw itchin g o ff rfd an d rpc a nd swi tch in g on a ll other bl ocks 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 . po wer d own (p ulse di ali ng ): wh en th e ch ip is in po wer -d own mod e ( 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 cont r are the only active blocks. 3. ringing: during ringing, the supply for the system is fed into v b via the ringing power co nver ter ( rpc). the on ly fun cti on al a mp lifie rs ar e in th e sp ea ker a mp lifier secti on (sai, sa, sacl). 4. external supply: in an answering machine, the chip is powered by an external supply via pin v b . th is a pp lica ti on all ows the po ssibi lity to activa te al l amplifie rs (excep t th e tra nsmi t lin e in terface txa). se le cti ng impsel = hi gh im pe da n ce activate s a ll switche s at the es line. 3. 2 acou sti c feed back sup pression acoustical feedback from the loudspeaker to the handset microphone may cause instability in the system. the u4090b-p offers a very efficient feedback suppression circuit, which uses a modified voice switch topology. fi gu re 3 -4 on pa ge 10 shows the basic system configuration. two attenuators (tx att and rx att) reduce the critical loop gain by introducing an externally ad ju sta b le am ou nt of lo ss e ithe r in the tr an smit or in th e re ce ive pa th. the sliding con tr ol in blo ck 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 compressed tx- an d rx- e nve lo pe curve . the system configuration for group listening, which 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 4741d?cord?01/10 u4090b-p figure 3-4. basic voice switch system figure 3-5. integration of the acoustic feedback suppression 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 4741d?cord?01/10 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 logarithmic 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 at af s ? i atgsa ? i ag af s g = i at 0 .67 db/a figure 3-7 on page 12 ill ustra tes th e p rin cip le re la ti on shi p be twee n sp ea ker amplifier ga in (gsa) an d a tte nu a ti on o f afs (ataf s) . both p ar am ete rs can be a d juste d in de pen dently, but the inter- na l co up lin g b e tw ee n th em ha s to b e co nsi de re d. th e m axim um usa ble 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 . i ata s sets maxi mum attenuation i atg s a decreases the attenuation when speaker amplifier gain is reduced i ag af s d e crea se s th e a tte nu atio n a ccor din g to th e lo op g ai n r eduction 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 4741d?cord?01/10 u4090b-p figure 3-7. reduci ng speaker ampli fi er gain resul ts in an equal reduction of afs attenuation figure 3-8. line detection with two comparators for speech mode and pulse dialing 3. 3 lin e detecti on (lidet) the lin e cu rr en t su p ervi sion is a ctive u nd er al l op er atin g co nd itio ns o f the u 4090b-p. in speech mo de (pd = in active ), the lin e -cu rre nt co mp ara tor use s the sam e th re sho ld s as th e comp ar ator for switching off the entire speaker amplifier. the basic behavior is illustrated in figure 3-9 on pa ge 13 . actual values of ilon/iloff vary slightly with the adjustment of the dc characteristics an d th e sel ectio n o f th e in te rn al l ine imp ed a nce . when power down is activated (during pulse dialing), the entire line current flows through the short-circuiting transistor qs (see fig u re 3 -3 o n pa ge 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 4741d?cord?01/10 u4090b-p figure 3-9. line detection in speech mode wi th hysteresis 3.4 ringing power converter (rpc) the rpc transforms the input power at vring (high voltage/low current) into an equivalent out- put po we r at v b (lo w voltag e/high current) which is cap able 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 ri ngi ng freq uency detecto r (rf d) the u4 09 0b-p offer s a n o utp ut sig na l for th e mi croco n tr oll er , wh ich i s a di gital repr esentati on of the double ringing frequency. it is generated by a current comparator with hysteresis. the input voltage v ring is tra nsfo rme d in to a cur re nt vi a rtha. th e thr esh ol ds ar e 8 a and 24 a. r fdo an d v ring ar e in ph a se. a seco nd co mp ar ato r with hyste re sis i s u sed to enabl e the outp ut r fdo 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 4741d?cord?01/10 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 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 ri ng 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 to t 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 m a, rd c = 130 k , t am b = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v imps el = gnd, v mu tx = gnd, v mu tr = gnd, unless otherwise specified. par ameters test co ndi tio ns symbo l m in . typ. m ax. u ni t 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 tran smissio n amp li fier, 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 am b = ?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 distor tion 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 micoma x ?5.2 dbm
15 4741d?cord?01/10 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 distor tion 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 recei vin g amp li fier, 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 dt mf i n to rec o 1, 2 i l 14 ma v mu tx = 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 am b = ?10 to +60c g r 0.5 db ear-protection differential i l 14 ma, v gen = 11 v rm s ep 2.2 v rms mute suppression a) recatt b) ra2 c) dtmf operation i l 14 ma mutr = open v mu tr = v mp v mu tx = v mp g r 60 db output voltage d 2% differential i l = 14 ma, z ea r = 68 nf + 100 0.775 v rms maximum output current d 2% z ea r = 100 4 ma (peak) receiving noise psophometrically weighted z ea r = 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 m a, rd c = 130 k , t am b = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v imps el = gnd, v mu tx = gnd, v mu tr = gnd, unless otherwise specified. par ameters test co ndi tio ns symbo l m in . typ. m ax. u ni t
16 4741d?cord?01/10 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 impse l = gnd v impse l = v mp z imp z imp 570 840 600 900 640 960 distor tion 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 gs a = 560 k r gs a = 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 ps op h 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 tur ning 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 dt mf a mpl ifi er test c on di tio ns: im p = 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 m ute act ive: mu tx = 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 distor tion 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 m a, rd c = 130 k , t am b = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v imps el = gnd, v mu tx = gnd, v mu tr = gnd, unless otherwise specified. par ameters test co ndi tio ns symbo l m in . typ. m ax. u ni t
17 4741d?cord?01/10 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 in ld t = 0 a r ata f s = 30 k i in ld r = 10 a g t 45 db attenuation of speaker amplifier i l 15 ma i in ld p = 0 a r ata f s = 30 k i in ld r = 10 a g sa 50 db afs disable i l 15 ma v atafs 1.5 v supply voltages, v mic = 25 mv, t am b = ?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 ri ng in g po wer co nverter, i mp = 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 h yst 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 rf d o 0 v mp v ring detector enable v ring = 25v, rf do high v mpon 1.8 2.0 2.2 v zener diode voltage i ri ng = 25 ma v ringmax 30.8 33.3 v mu tr i np ut mu tr input c urrent v mu tr = gnd i l > 14 ma v mu tr = v mp i mu te ?20 +10 ?30 a mu tr input volt age mute low; i l > 14 ma v mu te 0.3 v mute high; i l > 14 ma v mu te vmp ? 0.3v v 6. electrical characteristics (continued) f = 1 khz, 0 dbm = 775 mv rms , i m = 0.3 ma, i mp = 2 m a, rd c = 130 k , t am b = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v imps el = gnd, v mu tx = gnd, v mu tr = gnd, unless otherwise specified. par ameters test co ndi tio ns symbo l m in . typ. m ax. u ni t
18 4741d?cord?01/10 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 = ac tive i l = 100 ma, pd = active v l 1.5 1.9 v input characteristics of impsel input current i l 14 ma v impse l = v mp v impse l = gnd i imp sel i imp sel 18 ?18 a a input voltage input high v imps el v mp ? 0.3v v input low v imps el 0.3 v mu tx in pu t input current v mu tx = v mp v mu tx = gnd i mu tx i mu tx 20 ?20 30 ?30 a a input voltage input high v mu tx v mp ? 0.3v v input low v mu tx 0.3 v li ne detecti on 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 m a, rd c = 130 k , t am b = 25c, rgsa = 560 k , z ear = 68 nf + 100 , z m = 68 nf, pin 31 open, v imps el = gnd, v mu tx = gnd, v mu tr = gnd, unless otherwise specified. par ameters test co ndi tio ns symbo l m in . typ. m ax. u ni t
19 4741d?cord?01/10 u4090b-p 7. u4090b-p control ta ble 7- 1. selection of tx mute and line impedance lo gi c l evel im psel mod e 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 ta ble 7- 2. selection of earpiece mute and answering machine mode lo gi c l evel mu tr mod e 0 ra2 = on rec att = on sti s + st il = on speech 0 to z ra2 = on rec att = off stis = on, stil = off for answering machine 1 to z ra2 = off rec att = off stis = on, stil = off aga of f for st is for answering machine 1 ra2 = off rec att = on sti s + st il = on speech + ear peace mute ta ble 7- 3. selection of transmit mute lo gi c l evel mu tx mod e 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 dt mf t o rec eive enable afs = off aga = off txacl = off dt mf dialling
20 4741d?cord?01/10 u4090b-p 8. explanation of abbreviations recatt = recei ve attenuation stis, stil = inputs of sidetone balancing amplifiers es = external supply afs = acoustic feedback suppression control aga = automatic gain adjustment ra2 = inverting receive ampli fi er txacl = tr an smit a nti-cl ipp in g co ntro l figure 8-1. typical dc characteristic figure 8-2. typica l adju stme nt ra ng e o f tr an smit gain ta ble 7- 4. sp eci fi catio n o f l og ic le vel s logic level 0 = < (0.3v) z = > (1v) < (vmp ? 1v) or (open input) 1 = > (vmp ? 0.3v) 0 2 4 6 8 10 12 0 102030405060 708090100 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 4741d?cord?01/10 u4090b-p figure 8-3. typica l adju stme nt ra ng e o f re cei ve gai n (di ffe re ntia l outpu t) figure 8-4. typica l aga ch ar acter istic figure 8-5. typica l l oa d ch ar acte ristic 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 4741d?cord?01/10 u4090b-p figure 8-6. typica l l oa d ch ar acte ristic of v b for a me di um dc -cha ra cter istic (rdc = 130 k ) and 3-mw loudspeaker output figure 8-7. typica l l oa d ch ar acte ristic of v b for a minim um dc -character istic (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 4741d?cord?01/10 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: ringer 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 4741d?cord?01/10 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 4741d?cord?01/10 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 4741d?cord?01/10 u4090b-p figure 8-11. test circuit for r eceiving 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 open pins should be connected as shown in figure 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 4741d?cord?01/10 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 4741d?cord?01/10 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 4741d?cord?01/10 u4090b-p figure 8-14. test cir cuit for r ing in g powe r co nve rte r 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 4741d?cord?01/10 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 4741d?cord?01/10 u4090b-p figure 8-16. ap pl icatio n ci rcu it fo r lo ud -h ea ri ng 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 4741d?cord?01/10 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 4741d?cord?01/10 u4090b-p ta ble 8- 1. typical values of external components ( figure 8-16 on page 31 and fig ur e 8- 17 on pa ge 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 4741d?cord?01/10 u4090b-p 10. package information 11. revision history 9. ordering information extended type number package remarks u4090b-pfng3y sso44 taped and reeled, pb-free t4090b-pc die chip on foil te chni cal d rawi ngs ac c or d in g to d in speci f icat io ns package sso44 di mensions 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 0.2 5 44 23 122 please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. revi sio n no . hi stor y 4741d-cord-01/10 ? section 9 ?order ing information? on page 34 changed
4741d?cord?01/10 headquarters international atmel corporation 2325 orchard parkway sa n jo se, ca 95 13 1 usa tel: 1 (4 08 ) 44 1-03 11 fax: 1(40 8) 48 7-26 00 atmel asia unit 1-5 & 16, 19/f bea tower, millennium city 5 41 8 kwun ton g roa d kwu n to ng, ko wlo on hong kong tel: (852) 2245-6100 fax: (8 52 ) 272 2-13 69 atmel europe le kreb s 8, ru e jean -pierre timb au d bp 30 9 78 05 4 saint-quentin-en-yvelines cedex france tel: (33 ) 1-30 -6 0-70 -00 fax: (33) 1-30-60-71-11 at me l ja p an 9f, to ne tsu s hinka wa b ld g. 1-24 -8 sh in kawa chuo-ku, tokyo 104-0033 japa n te l: (81 ) 3-35 23-3 551 fa x: (81 ) 3-35 23 -7 58 1 product contact we b si te www.atmel.com technical support cordle ss_ph on e@a tmel.co m sal es contac t www.atmel.com/contacts literature requests w ww .a tm el .co m/ li te ra tu re disclaimer: the inform ation in this document is p rovided in con nect ion with atmel products. no license, express or implied , by estoppe l or otherwise, to any intellectua l p roperty right is granted by this docum ent or in connection with the sa le of atmel p roducts. except as set forth in atmel?s terms and condi- tions of sale located on atmel?s web site, atmel assumes no liability whatsoever and disclaims a ny express, implied or statutor y warranty r elating to its products including, but not l imit ed to, the implied war ranty of merchanta bility, f itness for a particu lar pur pose, or non- infringemen t. in no event shal l atmel be liable for any direct, indirect, consequential , pu nitive, special or i nciden- tal damages (including, withou t limitation, damages for loss of profits, business interruption, or loss of information) arising out of the use o r inability to use this document, even if at mel has been advised o f th e possibility of such damages. atmel makes no representations or warranties with respect to the accura cy or comp let eness of t he contents of this document an d reserves the rig ht to make change s to specifica tions and p roduct descriptions at any time witho ut not ice. at mel does not make any commitment to update the information cont ain ed her ein. u nle ss specifically provided otherwise, atmel products are not suitable for, and shall not b e used in, aut omotive applications. atmel?s produ cts are not int ended, authorized, or warranted for use as co mponents in applications int ended to sup port or sustain life. ? 2010 atmel corporation. all rights reserved. atmel ? , logo and combinations thereof, and others are registered trademarks or trademarks of atmel corporation or its subsidiaries. other terms and product names may be trademarks of others.

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