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features ? adjustable dc characteristic ? transmit and receive gain adjustable ? symmetrical input of microphone amplifier ? anti-clipping in transmit direction ? automatic line-loss compensation ? built-in ear protection ? dtmf and mute input ? adjustable sidetone suppression independen t of sending and receiving amplification ? integrated amplifier for open-listening operation ? anti-clipping for loudspeaker amplifier ? improved acoustical feedback suppression ? selectable line impedance ? voice switch ? supply voltages for all functional blocks of a subscriber set ? operation possible from 10-ma line current ? filters against emi on critical i/o benefits ? complete system integration of an alog signal proc essing on one chip ? very few external components ? less components for emi protection applications ? feature phones ? answering machines ? fax machines ? speaker phones 1. description the atmel ? telephone circuit u4089b-p is a linear integrated circuit for use in feature phones, answering machines and fax machines. it contains the speech circuit, sidetone equivalent and ear protection rectif iers. the circuit is line-powered and con- tains all components necessary for the amplification of signals and adaptation to the line. an integrated voice switch with loudspeaker amplifier enables open-listening or hands-free operation. with an anti-feedba ck function, acoustical feedback during open listening can be reduced significantly. the generated supply voltage is suitable for a wide range of peripheral circuits. monolithic integrated feature phone circuit atmel u4089b-p 4518d?cord?02/11
2 4518d?cord?02/11 atmel u4089b-p figure 1-1. simple block diagram figure 1-2. block diagram s peech circ u it a u dio a mplifier voice s witch di a ler aco us tic a l feed ba ck su ppre ss ion control 27 26 29 2 8 25 mic 4 3 1 tx acl 41 s acl 11 21 tr a n s mit m u te control 2 3 txa aga control r- a tten ua tion c u rrent su pply power su pply 1 3 10 9 6 3 0 7 3 2 44 su pply 24 22 3 9 40 3 6 42 mic1 mic2 dtmf ttxa inldr inldt tldr tldt ataf s s ao t s acl s ai g s amutxrecogr s ti recin v l s to gt aga ind s en s e v b v mp i ref gnd v m 600 900 20 imp s el imped a nce control 3 1 8 33
3 4518d?cord?02/11 atmel u4089b-p 2. pin configuration figure 2-1. pinning sso44 1 2 3 4 5 6 7 8 9 10 11 12 1 3 14 15 16 17 1 8 19 20 21 22 44 4 3 42 41 40 3 9 38 3 7 3 6 3 5 3 4 33 3 2 3 1 3 0 29 2 8 27 26 25 24 2 3 iref aga tldr tldt inldr inldt vm s to ataf s nc nc s ti mutx s ai reco nc nc ttxa gr recin nc gt dtmf nc mic2 mic1 nc ind vl gnd s en s e vb s ao nc vmp nc nc nc nc nc nc imp s el t s acl g s a table 2-1. pin description pin symbol function 1 dtmf input for dtmf signals. also used for the answering machine and hands-free input. 3 mic 2 non-inverting input of microphone amplifier. 4 mic 1 inverting input of microphone amplifier. 6ind the internal equivalent inductance of the circuit is proportional to the va lue of the capacitor at this pin. a resistor connected to ground may be used to reduce the dc line voltage. 7v l line voltage. 8 gnd reference point for dc and ac output signals. 9 sense a small resistor (fixed) connected from this pin to v l sets the slope of the dc characteristic, and affects the line-length equalization characte ristics, and the line current at wh ich the loudspeaker amplifier is switched on. 10 v b unregulated supply voltage for peripheral circui ts (voice switch); limited to typically 7v. 11 sao output of loudspeaker amplifier. 13 v mp regulated supply voltage 3.3v for peripheral circuits. the maximum output current is 2ma. 20 impsel control input for selection of line impedance 1) 600 2) 900 3) mute of second transmit stage (t xa); also used for indication of external supply (answering machine); last chosen impedance is stored. 21 tsacl time constant of anti -clipping of speaker amplifier. 22 gsa current input for setting the gain of the speaker ampl ifier. adjustment characte ristic is logarithmical. for rgsa > 2m , the speaker amplifier is switched off. 23 sai speaker amplifier input (for loudspeaker, tone ringer and hands-free use). note: filters against electromagnetic interference (e mi) are located at pins mic1, mic2, recin and sti.
4 4518d?cord?02/11 atmel u4089b-p 24 mutx three-state input of transmit mute: 1) speech condition; inputs mic1/mic2 active. 2) dtmf condition; input dt mf 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 hand s-free use; receive branch is not affected. 25 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. 26 inldt input of transmit level detector. 27 inldr input of receive level detector. 28 tldt time constant of transmit level detector. 29 tldr time constant of receive level detector. 30 aga automatic gain adjustment with line current. a resistor connected from this pin to gnd sets the starting point. maximum gain change is 6 db. 31 iref internal reference current generation; rref = 62k ; iref = 20a 32 sto side-tone reduction output. output resistance is approximately 300 . maximum load impedance is 10k . 33 v m reference node for microphone-earphone and loudspeak er amplifier. supply for electret microphone (im 300ma). 36 sti input for side-tone network. 39 reco output of receiving amplifier. 40 g r a resistor connected from this pin to gnd sets the receiving amplificatio n of the circuit; amplifier ra1 can be muted by applying v mp to g r . 41 ttxa time constant of anti-clipping in transmit path. 42 recin input of receiving path; input impedance is typically 80k . 44 g t a resistor from this pin to gnd se ts the amplification of microphone and dtmf signals; the input amplifier can be muted by applying v mp to g t . table 2-1. pin description (continued) pin symbol function note: filters against electromagnetic interference (e mi) are located at pins mic1, mic2, recin and sti.
5 4518d?cord?02/11 atmel u4089b-p 3. dc line interface and supply-voltage generation the dc line interface consists of an electron ic inductance and an output stage which charges the capacitor at 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, the pnp current source (i bopt ) supplies an extra amount of current to the supply voltages when the npn in parallel is unable to conduct current. the atmel ? u4089b-p contains a series regulator which provides a supply voltage v mp of 3.3v at 2ma suitable for a microprocessor. figure 3-1. dc line interface with electronic inductance and generation of regulated and unregulated supply figure 3-2. functional blocks for power supply - + i bopt < 5 ma 3 0 k r 3 0 v off s s en s e ind r s en s e 10 10 f r dc c ind v l - + 3 . 3 v 7v v mp v b 3 . 3 v/ 2 ma 47 f 220 f 7v v b mic, dtmf aga, ra tx mute mut rec, s tbal recatt af s s al, s a s acl off s a comp txa txacl lidet volt a ge reg u l a tor power su pply v l v lon v mp imped contr imp s el e s
6 4518d?cord?02/11 atmel u4089b-p 1. in speech condition, the system is supplied by the line current. if the lidet block detects a line voltage above the fixed threshold (1.9v), the internal signal vlon is activated, thus switching on all blocks of the chip. for line voltages below 1.9v, the switches rema in in their quiescent state as shown in figure 3-2 . offsacomp disables the group listening featur e (sai, sa, sacl, afs) below line currents of approximately 10 ma. 2. selecting impsel = high impedance acti vates all switches on the es line. 4. acoustic feedback suppression acoustical feedback from the loudspeaker to the handset micr ophone may cause instability in the system. the atmel ? u4089b-p offers a very efficient feedback suppression circuit which uses a modified voice switch topology. figure 4-1 shows the basic system configuration. two attenuators (tx att and rx att) reduce the critical loop gain by introducing an exter- nally adjustable amount of loss either in the transmit or in the receive path. the sliding control in block att contr determines whether the tx or the rx signal has to be attenuated. the overall loop gain remains constant under all operating conditions. selection of the active channel is made by comparison of the logarithmically compressed tx and rx envelope curves. the system configuration for grou p listening, which is realized in the atmel u4089b-p, is illus- trated in figure 4-2 . txa and sai represent the two attenuators; the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes). figure 4-1. basic voice-switch system h a nd s et microphone tx a tten ua tion atten ua tion control log a rithmic hy b rid line lo u d s pe a ker log a rithmic rx a tten ua tion
7 4518d?cord?02/11 atmel u4089b-p figure 4-2. integration of the acoustic feedback-suppression circuit into the speech circuit environment figure 4-3. acoustic feedback suppression by alternative control of transmit and speaker amplifier gain + - vbg af s control inldt tldt m a x a tt. aga s to vl + - vbg s ai inldr zint reco gt s ao tldr s ai gr s ti g s a z l v l v b recin s tn s to txa s ai iatg s a aga iagaf s ig s a tldt inldt inldr rldt rldr ataf s g s a tldr rataf s aga
8 4518d?cord?02/11 atmel u4089b-p figure 4-3 on page 7 provides a detailed diagram of the afs (acoustic feedback suppres- sion). receive and transmit signals are first pr ocessed by logarithmic rectifiers in order to produce the speech envelopes 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 is comprised of three parts: i atafs 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 i at = i atafs ? i atgsa ? i agafs g = i at 0.67 db/ a figure 4-4 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. the maximum gsa value to be used is 36 db. the shape of the characteristic is moved in th e x-direction by adjusting resistor ratafs, thus changing atafs m . the actual value of the attenuation (atafs a ), however, can be deter- mined 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 = 36db ? atafs m . figure 4-4. reducing speaker amplifier gain re sults in an equa l reduction of afs attenuation ataf s (db) 3 6 db ataf s m ataf s a g s a o g s a a g s a (db) not usab le rataf s rataf s
9 4518d?cord?02/11 atmel u4089b-p 5. operating range of speaker amplifier the basic behavior is illustrated in figure 5-1 . actual values of il on /il off vary slightly with the adjustment of the dc characteristics and the selection of the internal line impedance. figure 5-1. threshold of speaker amplifier figure 5-2. comparator thresholds depend on dc mask and line impedance il s a on s a off il off il on 3 4 5 6 7 10.0 12.0 14.0 16.0 1 8 .0 20.0 i l ( ma ) rdc = 6 8 k rdc = rdc = 1 3 0 k v l (v) = ilon a t line imped a nce = 600 = iloff a t line imped a nce = 600 = ilon a t line imped a nce = 900 = iloff a t line imped a nce = 900 8
10 4518d?cord?02/11 atmel u4089b-p 6. absolute maximum ratings parameters symbol value unit line current i l 140 ma dc line voltage v l 12 v 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, sso44 p tot 0.9 w esd (human body model), esd s 5.1 standard v esd 1.5 kv esd (machine model), jedec a115a v esd 150 v 7. thermal resistance parameters symbol value unit junction ambient r thja 70 k/w 8. electrical characteristics f = 1khz, 0dbm = 775mv rms , i m = 0.3ma, i mp = 2ma, rdc = 130k , t amb = 25c, rgsa = 560k , z ear = 68nf + 100 , z m = 68nf, pin 30 open (aga), v mutx = gnd, see figure 8-11 on page 22 (ac tests), unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit dc characteristics (see figure 8-8 on page 19 ) dc voltage drop over circuit i l = 2ma i l = 14ma i l = 60ma i l = 100ma v l 4.6 8.8 2.4 5.0 7.5 9.4 5.4 10.0 v v v v transmission amplifier, i l = 14ma, v mic = 2mv, rgt = 27k , unless otherw ise specified adjustment range of transmit gain g t 40 45 50 db transmitting amplification rgt = 12k rgt = 27k g t 47 39.8 48 49 41.8 db frequency response i l 14ma, f = 300hz to 3400hz g t 0.5 db gain change with current pin 30 open (aga), i l = 14ma to 100ma g t 0.5 db gain deviation t amb = ?10 c to +60c g t 0.5 db cmrr of microphone amplifier cmrr 60 80 db input resistance of mic amplifier rgt = 12k rgt = 27k r i 45 50 75 110 k distortion at line i l > 14ma v l = 700mv rms d t 2% maximum output voltage i l > 19ma, d < 5% v mic = 25mv ctxa = 1f v lmax 1.8 3 4.2 dbm
11 4518d?cord?02/11 atmel u4089b-p noise at line psophometrically weighted i l > 14ma g t = 48db n o ?80 ?72 dbmp anti-clipping attack time release time ctxa = 1f each 3db overdrive 0.5 9 ms ms gain at low operating current i l = 10ma i mp = 1ma rdc = 68k v mic = 1mv i m = 300a g t 40 42.5 db distortion at low operating current i l = 10ma i m = 300a i mp = 1ma rdc = 68k v mic = 10mv d t 5% line-loss compensation i l = 100ma, raga = 20k g ti ?6.4 ?5.8 ?5.2 db mute suppression a) mic muted (microphone preamplifier) i l 14ma mutx = open g tm 60 80 db receiving amplifier, i l = 14ma, rgr = 62k , unless otherwise specified, v gen = 300mv adjustment range of receiving gain i l 14ma, single ended g r ?8 +2 db receiving amplification rgr = 62k rgr = 22k g r ?7.75 ?7 1.5 ?6.25 db amplification of dtmf signal from dtmf in to reco i l 14ma v mutx = v mp g rm 147db frequency response i l > 14ma, f = 300hz to 3400hz g rf 0.5 db gain change with current i l = 14ma to 100ma g r 0.5 db gain deviation t amb = ?10 c to +60 c g r 0.5 db ear protection i l 14ma v gen = 11v rms ep 1.1 v rms mute suppression dtmf operation i l 14ma v mutx = v mp g r 60 db output voltage d 2% i l = 14ma z ear = 68nf 0.5 v rms maximum output current d 2% z ear = 100 4 ma (peak) receiving noise psophometrically weighted z ear = 68nf + 100 i l 14ma n i ?80 ?77 dbmp output resistance output against gnd r o 10 line-loss compensation raga = 20k , i l = 100ma g ri ?7.0 ?6.0 ?5.0 db ac impedance z imp 840 900 960 8. electrical characteristics (continued) f = 1khz, 0dbm = 775mv rms , i m = 0.3ma, i mp = 2ma, rdc = 130k , t amb = 25c, rgsa = 560k , z ear = 68nf + 100 , z m = 68nf, pin 30 open (aga), v mutx = gnd, see figure 8-11 on page 22 (ac tests), unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit
12 4518d?cord?02/11 atmel u4089b-p gain at low operating current i l = 10ma i mp = 1ma i m = 300a v gen = 560mv rdc = 68k g r ?8 ?7 ?6 db distortion at low operating current i l = 10ma i mp = 1ma v gen = 560mv rdc = 68k d r 5% speaker amplifier minimum line current for operation no ac signal i lmin 15 ma input resistance 23 14 22 k gain from sai to sao v sai = 3mv, i l = 15ma, rgsa = 560k rgsa = 20k g sa 35.5 36.5 ?3 37.5 db db output power load resistance r l = 50 , d < 5% v sai = 20mv i l = 15ma i l = 20ma p sa p sa 37 20 mw mw output noise (input sai open) psophometrically weighted i l > 15ma n sa 200 v psoph gain deviation i l = 15ma t amb = ?10 c to +60 c g sa 1 db mute suppression i l = 15ma, v l = 0dbm, v sai = 4mv pin 23 open v sao ?60 dbm gain change with current i l = 15ma to 100ma g sa 1 db resistor for turning off speaker amplifier i l = 15ma to 100ma rg sa 0.8 1.3 2 m gain change with frequency i l = 15ma f = 300hz to 3400hz g sa 0.5 db attack time of anti-clipping 20db overdrive t r 5ms release time of anti-clipping t f 80 ms tmf amplifier test conditions: imp = 2ma, im = 0.3ma, v mutx = vmp adjustment range of dtmf gain i l = 15ma mute active g d 40 50 db dtmf amplification i l = 15ma, v dtmf = 8mv mute active: mutx = vmp g d 40.7 41.7 42.7 db gain deviaton i l = 15ma t amb = ?10c to +60c g d 0.5 db 8. electrical characteristics (continued) f = 1khz, 0dbm = 775mv rms , i m = 0.3ma, i mp = 2ma, rdc = 130k , t amb = 25c, rgsa = 560k , z ear = 68nf + 100 , z m = 68nf, pin 30 open (aga), v mutx = gnd, see figure 8-11 on page 22 (ac tests), unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit
13 4518d?cord?02/11 atmel u4089b-p input resistance rgt = 27k , rgt = 15k r i 60 26 180 70 300 130 k distortion of dtmf signal i l 15ma v l = 0dbm d d 2% gain deviation with current i l = 15ma to 100ma gd 0.5 db afs acousting feedback suppression range of attenuation i l 15ma 0 50 db attenuation of transmit gain i l 15ma, i inldt = 0a r ata f s = 30k i inldr = 10a g t 45 db attenuation of speaker amplifier i l 15ma i inldp = 0a r at a f s = 30k i inldr = 10a g sa 50 db afs disable i l 15 ma v ata f s 1.5 v supply voltages, v mic = 25mv, t amb = ?10c to +60c v mp i l = 14ma, rdc = 68k i mp = 2ma v mp 3.1 3.3 3.5 v v m i l 14ma, i m = 300a rdc = 130k v m 1.4 3.3 v v b i b = +20ma, i l = 0ma v b 77.6v mutx input (see figure 8-9 on page 20 ) 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 8. electrical characteristics (continued) f = 1khz, 0dbm = 775mv rms , i m = 0.3ma, i mp = 2ma, rdc = 130k , t amb = 25c, rgsa = 560k , z ear = 68nf + 100 , z m = 68nf, pin 30 open (aga), v mutx = gnd, see figure 8-11 on page 22 (ac tests), unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit
14 4518d?cord?02/11 atmel u4089b-p table 8-1. atmel ? u4089b-p control afs = acoustical feedback-suppression control aga = automatic gain adjustment txacl = transmit anti-clipping control es = external supply mutx mode 0 mic1, mic2 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 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 logic level 0 = < (0.3v) z = > (1v) < (v mp ? 1v) or (open input) 1 = > (v mp ? 0.3v)
15 4518d?cord?02/11 atmel u4089b-p figure 8-1. typical dc characteristic figure 8-2. typical adjustment range of the transmit gain
16 4518d?cord?02/11 atmel u4089b-p figure 8-3. typical adjustment range of the receive gain figure 8-4. typical aga characteristic
17 4518d?cord?02/11 atmel u4089b-p figure 8-5. typical load characteristic of v b for a maximum (rdc = infinity) dc characteristic and a 3-mw loudspeaker output figure 8-6. typical load characteristic of v b for a medium dc characteristic (rdc = 130k ) and a 3-mw loudspeaker output
18 4518d?cord?02/11 atmel u4089b-p figure 8-7. typical load characteristic of v b for a minimum dc characteristic (rdc = 68k ) and a 3-mw loudspeaker output
19 4518d?cord?02/11 atmel u4089b-p figure 8-8. dc voltage absolute gt 44 gt dtmf 1 mic2 mic1 3 4 open idio cmic 68n ind vl gnd sense gsa sao vmp impsel tsacl recin ttxa gr reco sti vm sto iref aga tldr tldt inldr inldt atafs mutx sai vb 6 7 rdc s4 s1 10u cind 8 9 10 10 vb dc ib c b s2a 11 100k 13 rgs rsense rsao rvmp 1.65k 20 dc + vimpsel 21 csacl 1u 42 41 crin 47n ctxa 1u 40 rgr 39 rh 100 ch 68n vl 36 rnw2 3k vm 33 cm 100u im open 32 rref 62k 31 30 raga 29 28 cldr cldt 1n 1n 27 26 2.2n 2.2n 2meg 2meg on adapter cause of stability 25 ratafs 24 vmu tx + dc 23 open 22 rgsa cmp 4.7u s5 il cb
20 4518d?cord?02/11 atmel u4089b-p figure 8-9. dc voltage current test gt 44 gt u7 dtmf 1 mic2 mic1 3 4 open cmic 68n ind vl gnd sense gsa sao vmp impsel tsacl recin ttxa gr reco sti vm sto iref aga tldr tldt inldr inldt atafs mutx sai vb 6 7 rdc s1 10u cind 8 9 10 10 vb dc s2 b a 11 100k 13 rgs rsense rsao rvmp 1.65k 20 21 csacl 1u 42 41 crin 47n ctxa 1u 40 rgr 39 rh 100 ch 68n vl 36 rnw2 3k vm 33 cm 100u im 32 rref 62k 31 30 raga 29 28 cldr cldt 1n 1n 27 26 2.2n 2.2n 2meg 2meg on adapter cause of stability 25 ratafs 24 vmu tx + dc 23 open 22 rgsa cmp 4.7u il cb + dc vsacl + isacl s4 dc vtxa itxa s10 + vm s6 s8 istihs dc vsto id c isto s12 dc vaga + + iaga s5
21 4518d?cord?02/11 atmel u4089b-p figure 8-10. dc ramps gt 44 gt dtmf 1 mic2 mic1 3 4 open cmic 68n ind vl gnd sense gsa sao vmp impsel tsacl recin ttxa gr reco sti vm sto iref aga tldr tldt inldr inldt atafs mutx sai vb 6 7 rdc s4 10u cind 8 9 10 10 vb dc b a 11 100k 13 rgs rsense rsao vmp 1.65k 20 dc + vimpsel 21 csacl 1u 42 41 crin 47n ctxa 1u 40 rgr 39 rh 100 ch 68n vl 36 rnw2 3k vm 33 cm 100u im offen 32 rref 62k 31 30 raga 29 28 cldr cldt 1n 1n 27 26 2.2n 2.2n 2meg 2meg on adapter cause of stability 25 ratafs 24 vmu tx + dc 23 open 22 rgsa cmp 4.7u il cb vl dc s2 + + + 4.7u dc s5 a b s4 dc + ilcur s1
22 4518d?cord?02/11 atmel u4089b-p figure 8-11. ac tests gt 44 gt dtmf 1 mic2 mic1 3 4 open cmic 68n ind vl gnd sense gsa sao vmp impsel tsacl recin ttxa gr reco sti vm sto iref aga tldr tldt inldr inldt atafs mutx sai vb 6 7 rdc s4 10u cind 8 9 10 10 vb dc b a 11 100k 13 rgs rsense rsao vmp 1.65k 20 dc + vimpsel 21 csacl 1u 42 41 crin 47n ctxa 1u 40 rgr 39 rh 100 ch 68n vl 36 rnw2 3k vm 33 cm 100u im idc open 32 rref 62k 31 30 raga 29 28 cldr cldt 1n 1n 27 26 2.2n 2.2n 2meg 2meg on adapter cause of stability 25 ratafs 24 vmu tx + dc 23 open 22 rgsa il cb vl dc s2 + + + 4.7u dc s5 a b s4 dc + ilcur s1
23 4518d?cord?02/11 atmel u4089b-p table 8-2. typical values of external components (see figure 8-12 on page 24 ) name value name value name value name value c 2 4.7nf c 16 47f r 3 >68k r 16 1k c 3 10f c 17 10f r 4 10k r 17 1.2k c 4 220f c 18 10f r 6 62k r 18 30k c 5 47f c 21 1f r 8 22k r 21 15k c 7 1f c 23 6.8nf r 9 330k r 22 330k c 8 100f c 24 10nf r 10 3k r 23 220k c 10 150nf c 25 100nf r 11 62k r 24 68k c 11 68nf c 26 470nf r 12 30k r 25 2k c 12 33nf c 27 33nf r 13 62k r 26 3.3k c 14 100nf c 28 10f r 14 120k r 29 1k c 15 1f r 2 20k r 15 47k r 30 12k
24 4518d?cord?02/11 atmel u4089b-p figure 8-12. application for hands-free operation 4 3 micro- phone 1 6 c 3 3 0 44 r 1 r 26 c 24 c 25 hf-mic r 24 r 25 dtmf c 2 3 v m r 2 3 r 22 41 c 21 29 c 1 8 r 3 0 c 27 27 26 r 29 reco logtx 2 8 c 17 25 c 26 r 1 8 11 c 16 21 c 15 2 3 c 14 22 r 1 3 r 12 r 14 r 15 r 17 r 16 v mp lo u d s pe a ker 24 r 2 r 4 r 3 9 10 c 4 1 3 c 5 1 3 v 7 3 2 33 c 8 v m 8 3 1 r 6 c 2 r 11 40 3 6 r 8 c 11 r 9 c 12 v m to pin 3 2 v m r 10 c 2 8 e a rpiece 42 c 10 3 9 v l logtx r 21 bc177 v b hook s witch tip ring c 7 u40 8 9b-p 20 micro controller v m
25 4518d?cord?02/11 atmel u4089b-p 10. package information 9. ordering information extended type number package remarks u4089b-pfny sso44 tubes, pb-free U4089B-PFNG3Y sso44 taped and reeled, pb-free technic a l dr a wing s a ccording to din s pecific a tion s p a ck a ge ss o44 dimen s ion s in mm 0.25 0.10 0. 3 0. 8 1 8 .05 17. 8 0 16. 8 2. 3 5 9.15 8 .65 7.50 7. 3 0 10.50 10.20 0.25 44 2 3 1 22
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