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U3762MB preliminary information rev. a1, 15-sep-98 1 (23) universal telephone ic all functions integrated description temic's low-voltage telephone circuit U3762MB performs all the speech and line interface functions required in an electronic telephone set, the tone ringer, the pulse and dtmf dialing with redial. operation below 15 ma is possible with reduced performance (no dialing). features speech circuit adjustable dc characteristic symmetrical input of microphone amplifier receiving amplifier for dynamic or piezo-electric earpieces automatic line-loss compensation anti-clipping in transmit direction dialer dtmf / pulse switchable pulse dialing 66/33 or 60/40 or dtmf dialing selectable by pin flashing time duration 98 ms pause function last number redial up to 32 digits standard low-cost crystal 3.57 mhz or ceramic resonator key tone tone ringer 2-tone ringer adjustable volume rc oscillator adjustable threshold benefits low number of external components high quality through one ic solution ordering information type package remarks U3762MB-mfn sso44 U3762MB-mfng3 sso44 taped and reeled
U3762MB rev. a1, 15-sep-98 preliminary information 2 (23) block diagram / applications mask 470 f prind mode to key board matrix hks row & column programmable counter clock generator ram location latch read write counter control logic pulse control logic supply current regulator key board inter face xt 3.58 mhz kt earth dp data latch & decoder d / a converter mute control vdd hfi hfo test handsfree control logic mfo mic1 mic2 + micro phone amplifier mico tin 220 nf 18 k 220 nf mpsa42 3 k 33 k hks 220 k xt 2.2 nf cl 2.4 k 680 transmit amplifier control function sidetone amplifier control function agc current generator receiver attenuation receiving amplifier vl st 3.3 nf recin 47 nf reco1 2.2 f 100 reco2 330 1 f 470 13 v/ 1 w 5 m tip ring 75 v 5.1 v clock signal oscillator divider supply power on reset tone signal generator divider bandgap reference comparator with hysteresis agc 12 k rdc 39 300 1.8 k vi 100 f mute mfind vring 10 f out 10 k tha 10 k vriac c1 c2 c3 c4 r1 r2 r3 r4 123 456 789 f */t 0 # r/p 1 nf rck 150 k 2n5401 hks 1 w 14912 100 k 2.2 f clim 470 nf 1 k vi figure 1.
U3762MB preliminary information rev. a1, 15-sep-98 3 (23) pin description 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 r4 r3 r2 mask mode kt hks n.c. vdd out rck vring vriac agc tha st clim reco 1 reco 2 c2 c3 c4 earth hfi hfo xt mfo gnd mico vl rdc tin vi mute prind recin U3762MB c1 xt mfind mic 1 r1 test 14835 mic 2 dp sso44
U3762MB rev. a1, 15-sep-98 preliminary information 4 (23) pin symbol function configuration 1 c1 keyboard input c1 vdd vdd 2 c2 vdd pd 3 c3 vdd c2c4 4 c4 vdd pd = p rotection d evice 5 earth earth key ( 604 ms high pulse, 1 s pause) vdd earth pd 6 hfi input with 200 k pull-down resistor. hfi triggers hfo with each lh edge. hfi vdd vdd pd 200k 7 hfo output will be toggled by each lh edge at hfi. hfo vdd pd 8 9 xt xt a built-in inverter provides oscillation with an inexpensive 3.579545-mhz crystal or ceramic resonator xt vdd vdd vdd vdd xt pd pd 10 mfo output of dtmf dtmf output frequency specified actual error (hz) (hz) (%) r 1 697 699 +0.28 r 2 770 766 0.52 r 3 852 848 0.47 r 4 941 940 0.10 c 1 1209 1216 +0.57 c 2 1336 1332 0.30 c 3 1477 1472 0.34 mfo vdd vdd pd
U3762MB preliminary information rev. a1, 15-sep-98 5 (23) configuration function symbol pin 11 mfind output switches to low being in temporary dtmf mode. reset by on hook condition. vdd mfind pd mfind 12 gnd ground 13 14 mic 1 mic 2 inverting input of microphone amplifier non-inverting input of microphone amplifier mic2 vi vi mic1 pd pd 1v 1v 50k 50k 15 mico transmit pre-amp output which is normally capacitively coupled to pin tin vi 1v mico pd 16k 16 vl positive supply voltage input to the device. the current through this pin is modulated by the transmit signal. vl rdc pd pd 16v 17 rdc an external resistor (1 w) is required from this pin to gnd to control the dc input im- pedance of the circuit. it has a nominal value of 39 for low-voltage operation. values up to 100 may be used to increase the available transmit output voltage swing at the expense of low-voltage operation. rdc agc vl pd pd 18 tin input to the line output driver amplifier. transmit agc applied to this stage. 1v tin pd 5.6k 16v
U3762MB rev. a1, 15-sep-98 preliminary information 6 (23) configuration function symbol pin 19 v i this internal voltage bias line must be con- nected to vl via an external resistor which dominates the ac input impedance of the cir- cuit and should be 680 w for an 600- input impedance or 1.2 k w for a 900- w input im- pedance. vi pd 16v 20 mute pin for testing vbg mute pd mute 6.7v 30k 21 prind privacy indication pin open collector with minimum 1 ma drive current to gnd when privacy = active prind vl pd 6.7v 22 recin receive amplifier input. the receiving ampli- fication is regulated by an agc. recin 60k 23 24 reco2 reco1 output of the receive amplifier. dynamic transducers with a minimum impedance of 100 can be directly driven by these outputs. reco1 reco2 1v vl pd 60k 6.7v 25 clim time constant of anticlipping in transmit path. clim 2.2 f clim = gnd: anticlipping inactive vl clim idc pd 6v 26 st the output of the sidetone cancellation signal, which requires a balanced impedance of 8 to 10 times the subscribers line impedance to be connected to pin vl. st pd 16v 27 tha ringer threshold adjustment tha vriac 1v pd 6v 6v 12k 20k 140k 28 agc the range of transmit and receive gain varia- tions between short and long loops may be adjusted by connecting a resistor r agc from this pin to (gnd). this pin can be left open to set agc out of action. rdc agc vl pd pd 29 vriac ringing supply vriac pd 50v 70k 10k
U3762MB preliminary information rev. a1, 15-sep-98 7 (23) configuration function symbol pin 30 vring dc supply voltage for the tone ringer is lim- ited to 30 v with integrated z-diode. out vring pd pd 30v 50v 200 6.5k 31 rck rc clock oscillator for ringer 3.4v 0.8v rck pd 6v 6v 32 out buzzer output out vring pd pd 30v 50v 200 6.5k 33 vdd supply output for dialer part vl vdd pd 6v 6v 34 test test input with 6.25 k pull-up resistor vdd vdd vdd test pd 200k 35 n.c. not connected 36 hks hook switch input. hks = 0: on-hook state. chip in sleep mode, no operation (with a pull-down resistor of about 400 k . hks = 1: off-hook state. chip enable for normal operation. hks vdd vdd pd 400k 37 kt keytone output only sent out in pulse mode kt vdd vdd pd
U3762MB rev. a1, 15-sep-98 preliminary information 8 (23) configuration function symbol pin 38 mode pulling mode pin to: c3 tone mode with 87 ms burst time and 140 ms pause c4 tone mode with 87 ms dtmf burst and 87 ms pause r1 pulse mode with 20 pps, make/break = 40/60 r2 pulse mode with 20 pps, make/break = 33/66 r3 pulse mode with 10 pps, make/break = 40/60 r4 pulse mode with 10 pps, make/break = 33/66 c1 pulse mode with 10 pps, make/break = 33/66 and temp. dtmf with 87 ms dtmf burst, 140 ms pause mode pin pulled to r4: with temporary dtmf, 87 ms dtmf burst and 87 ms pause vdd vdd mode pd 39 dp pulse dialing output. flash key will cause dp to be active in either dtmf mode or pulse mode. in on-hook state is dp = vdd. dp vdd pd 40 mask short mute during pulse dialing, active high mask vdd pd 41 r1 keyboard input r1 vdd 42 r2 vdd pd 43 r3 vdd vdd r2r4 44 r4 vdd pd
U3762MB preliminary information rev. a1, 15-sep-98 9 (23) keyboard operation c1 c2 c3 c4 1 2 3 r1 4 5 6 r2 7 8 9 f r3 /t 0 # r/p r4 r/p: redial and pause function key /t: function; pulse-to-tone function f: flash key : hand set, mic mute normal dialing off hook , d1 , d2 , ..., dn 1. d1, d2, ..., dn will be dialed out. 2. dialing length is unlimited, but redial is inhibited if length oversteps 32 digits. 3. if redialing length oversteps 32 digits, the redialing function will be inhibited. redialing off hook , d1 , d2 , ..., dn busy, come on hook , off hook , r/p the r/p key can execute the redial function only as the first key-in after off-hook; otherwise, it executes the pause function (3.6 s). keys stored in redial memory: 0 to 9, *, #, r/p, f
U3762MB rev. a1, 15-sep-98 preliminary information 10 (23) 34 2 2 t kid t krd m t idp t pdp b t idp m b t idp t pdp t idp t kid low oscillation hks key in dp mute mask mfo osc 15019 figure 2. pulse mode normal dialing r/p m t pdp b t idp m b t idp low oscillation hks key in dp mute mask mfo osc 15020 t U3762MB preliminary information rev. a1, 15-sep-98 11 (23) r/p m t pdp b t idp m b t idp low oscillation hks key in dp mute mask mfo osc 15021 t krd t > t ohd t kid figure 4. pulse mode auto dialing 34 5 t kid t krd high oscillation hks key in mute mask osc 15022 2 dtmf t td t itp t itp t itp dp low figure 5. dtmf mode normal dialing
U3762MB rev. a1, 15-sep-98 preliminary information 12 (23) r/p t kid t krd high oscillation hks key in mute mask osc 15023 dtmf t td t itp dp t t ohd low figure 7. dtmf mode auto dialing (t t ohd )
U3762MB preliminary information rev. a1, 15-sep-98 13 (23) access pause off hook , d1 , d2 , r/p , d3 , ..., dn' 1. the pause function can be stored in the memory. 2. the pause function is executed in normal dialing and redialing. low oscillation hks key in dp mute mask mfo osc 15025 t kid 2 r/p 3 t pdp t pdp t p t idp figure 8. pause function
U3762MB rev. a1, 15-sep-98 preliminary information 14 (23) pulse-to-tone ( /t) off hook , d1 , d2 , ..., dn , /t , d1' , d2' , ..., dn' 1. a) if the mode switch is set to pulse mode, then the output signal will be: d1, d2, ..., dn, pause (3.6 s), d1', d2' ,..., dn' (pulse) (tone) 1. b) (pulse), (tone), (tone) if mode pin = c2, * is sent out as dtmf tone 2. if the mode switch is set to tone mode, then the output signal will be: d1, d2, ..., dn, * , d1', d2', ..., dn' (tone) (tone) (tone) 3. the dialer remains in tone mode when the digits have been dialed out and can be reset to pulse mode by going on-hook only. oscillation hks key in dp mute mask mfo osc 15026 t kid 2 */t 3 t pdp t p t idp mfind figure 9. pulse-to-tone operation
U3762MB preliminary information rev. a1, 15-sep-98 15 (23) flash (f) off hook , f n 1. the dialer will execute flash break and the entire flash pause time will elapse before the next digits are dialed out. 2. the flash key can be stored as a digit in the memory. only one flash, however, will be released to the users. 3. the system will return to the initial state after the flash pause time has elapsed. f t kid oscillation hks key in mute mask osc mfo t fp 3 f t fp t fb 15027 t itp high dp figure 10. flash operation t kid = key active in debounce t krd = key release debounce t pdp = pre-digit pause t idp = inter-digit pause t td = dtmf output duration t itp = intertone pause t fb = flash break time t fp = flash pause time t p = pause time 15028 key in dp mute mask earth low figure 11. symbolic timing diagram: earth function
U3762MB rev. a1, 15-sep-98 preliminary information 16 (23) 14909 hks hfi hfo pd off hook figure 12. symbolic timing diagram: hfi, hfo function 15029 hks dp off hook on hook 165 ms figure 13. symbolic timing diagram: on hook debounce time absolute maximum ratings parameters symbol value unit line current i l 140 ma dc line voltage v l 14 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 = 60 c sso44 p tot 0.9 w junction ambient sso44 r thja 70 k/w esd withstand voltage 1 kv according to mil standard 883d method 3015.7 (hbm)
U3762MB preliminary information rev. a1, 15-sep-98 17 (23) electrical characteristics speech circuit reference point pin gnd, f = 1000 hz, 0 dbm = 775 mv rms, r dc = 39 w / 1 w, t amb = 25 c, unless otherwise specified, refer to abasic test circuito. parameters test conditions / pin symbol min. typ. max. unit line voltage i l = 8 ma i l = 20 ma i l = 73 ma i l = 100 ma v l 3.6 5.9 6.9 1.4 3.85 6.55 4.1 7.2 8.2 v v v v transmit and sidetone input resistance r i r i 45 80 120 k w gain i l = 20 ma, s5 = open g s 46.8 47.8 48.8 db gain change with current i l = 20 to 60 ma r agc = infinite g s 0.5 0.5 db gain deviation t amb = 10 to +60 c i l = 20 ma g s 0.5 0.5 db line-loss compensation r agc = 12 k , i l = 73 ma g s 4.8 6 7 db max. output voltage at line i l = 20 ma, v mic = 10 mv, clim = 2.2 f, s 1 = open v lmax 1.2 dbm noise at line weighted psophometrically i l > 20 ma, g s = 48db n o 72 dbmp sidetone reduction i l 20 ma g sta 10 15 20 db dtmf amplifier volume range d < 5% single tone, i l 20 ma v l 1.3 dbm dtmf output level low frequency group i l = 20 ma, s5 = closed v l 8 4 dbm pre-emphasis between high- and low-level frequency group p pre = p hlg p llg, s5 = closed p pre 1 3 db receiving amplifier gain i l 20 ma g r 3 5 db gain change with current i l = 20 to 60 ma r agc = infinite g r 0.5 0.5 db gain deviation t amb = 10 to +60 c i l = 20 ma g r 0.3 0.7 db line-loss compensation i l = 73 ma g r 4.7 6 7 db receiving noise at earphone weighted psophometrially i l = 73 ma n i 77.5 71 dbm gain change when muted i l 20 ma g rm 24 29 34 db output voltage push-pull i l 20 ma, z ear = 68 nf, 100 in series, d 2% v reco 0.8 0.9 v rms ear protection differential i l = 40 ma, v gen = 4 v rms , z ear = 68 nf + 100 v ear 1.3 1.6 2.5 v rms supply voltage (for internal use only) output voltage * i l 20 ma dialing mode v dd 2.0 6.3 v available current for peripherals i l 20 ma dialing mode i dd 150 a distortion at line v l = 0.775 v rms i l = 20 ma, s5 = open d t 2 % maximum output voltage swing at line i l = 20 ma, v mic = 50 mv rms v l max 3.4 4 vpp mute suppression transmit with privacy function i l = 20 ma g spriv 60 db * output must be limited externally to max. 5.5 v
U3762MB rev. a1, 15-sep-98 preliminary information 18 (23) dc characteristics dialer v dd = 2.7 v, f osc = 3.58 mhz, all outputs unloaded, s9 closed; hks = 0 parameters test conditions / pins symbol min. typ. max. unit memory rentention current hks = 1, v dd = 1.0 v i mr 0.1 a pre-emphasis column/row 1 2 3 db dtmf distortion r l = 5 k d 30 23 db dp output sink current v po = 0.5 v i pl 0.5 ma keyboard input drive current v i = 0 v i kd 20 a keyboard input sink current v i = 2.7 v i ks 500 a key on resistance all other keys r kon 5 k key off resistance r koff 100 k mask sink / drive current i m h/l 0.5 ma earth sink / drive current i e h/l 0.5 ma ac characteristics dialer parameters test conditions / pins symbol min. typ. max. unit keypad active in debounce mode t kid 15 20 25 ms key release debounce t krd 15 20 25 ms pre-digit pause mode pin = r3 (10 pps) mode pin = c1, c2, c4 (10 pps) t pdp t pdp 37 31 40 33.3 41 33.5 ms ms mode pin = r1 (20 pps) mode pin = r2 t pdp t pdp 20 16.65 ms ms inter-digit pause ( auto dialing ) 10 pps, t ip = t idp + t pdp 20 pps t ip t ip 810 836 512 860 ms ms make/break ratio mode pin = r1 (20 pps), r3 (10 pps) mode pin = c1, c2, r4 (10 pps) r2 (20 pps) m/b 40.8:60.2 35.6:64.4 40:60 33:67 39.2:60.8 31.2:68.8 % % dtmf output duration auto dialing, mode = c4 mode = c3 t td 84 84 87 87 90 90 ms ms inter-tone pause auto dialing, mode = c4 mode = c3 t itp 84 135 87 140 90 147 ms ms flash break time, f c4 connected to r3 t fb 95 98 101 ms flash pause time f t fp 0.9 1 1.1 s pause time t p 3.5 3.6 3.7 s on-hook debounce time t ohd 220 ms
U3762MB preliminary information rev. a1, 15-sep-98 19 (23) unit max. typ. min. symbol test conditions / pins parameters break duration mode pin = r3 mode pin = c1, c2, r4 t b 57.6 63 60 66.7 62.4 69 ms ms mode pin = r1 (20 pps) mode pin = r2 t b 30 33.35 ms ms make duration mode pin = r3 mode pin = c1, c2, r4 t m 38 31 40 33.3 41 35 ms ms mode pin = r1 (20 pps) mode pin = r2 t m 20 16.65 ms ms break + make duration mode pin = c1, c2, r3, r4 t p 95 100 105 ms mode pin = r1, r2 (20 pps) t p 50 ms electrical characteristics tone ringer f rck = 4 khz, v ring = 20 v, t amb = 25 c, reference point gnd, unless otherwise specified parameters test conditions / pins symbol min. typ. max. unit supply current, outputs open v riac = 20 v i ring 2.1 3.8 ma switch-on threshold v riac , tha = open v ron 8 9 10 v switch-off threshold v riac v roff 5.0 5.6 6.5 v ringing frequency r = 150 k w , c = 1 nf v riac > v ron f 1h f 1l 937 752 1010 808 1083 868 hz hz audio sequence frequency f 2 11.5 12.5 14.0 hz output voltage swing v ring = 25 v, c out = 68 nf v out 21 23 v pp turn-off delay see figure 11 t off 65 100 ms 0 0 0 out vriac vring volt melody t off 12459 t t t figure 14. turn-off delay time
U3762MB rev. a1, 15-sep-98 preliminary information 20 (23) basic test circuit out 2.2 f vriac vring vmic to tester clock s7 68n 300 mv / 1 khz vgen 12k 600 1.5k 2.2n 4.7k 100n vgen 100 mv s5 8.2k 1 220n 220 vdd 2.2 39 47n 100 cl 25k 25k s6 il 100 13v 620 s11 3.58 mhz s8 s9 150k 1n earth mfind mute rck test hfo c2 gnd r1 r2 r3 r4 vriac mode hks vring vl vi prind tha st reco2 reco1 recin rdc agc clim vdd mfo mic1 mic2 mico tin out dp kt c3 c4 xt xt c1 hfi mask out out to tester in out in in in in i/o in vl vreco a b a b to tester i/o in to tester in in i/o out in in out in to tester i/o to tester U3762MB 330 14836 s1 figure 15. basic test circuit
U3762MB preliminary information rev. a1, 15-sep-98 21 (23) equations for electrical characteristic parameters of the speech circuit the equations refer to the basic test circuit. if not otherwise specified, the switches in the basic test circuit are inactive. transmit gain gs 20 log v l v mic v mic = 3 mv/1 khz, s5 = open receiving gain gr 20 log v reco v l rx-mode: v gen = 300 mv/1 khz, s7b line-loss compensation transmit gs gs(at i l 73 ma)gs(at i l 20 ma) tx-mode: v mic = 3 mv/1 khz, s5 = open sidetone reduction gsta 20 log v l v reco (in txmode) gr tx-mode: v mic = 3 mv/1 khz, s5 = open line-loss compensation receive gr gr(at i l 73 ma)gr(at i l 20 ma) rx-mode: v gen = 300 mv/1 khz, s7b gain change when muted grm 20 log v reco v l (mute inactive)20 log v reco v l (mute active) v gen = 100 mv/1 khz, s5 = open, s8 = open input impedance of microphone amplifier ri 50 k v l (s6 closed) v l (s6 open) 1 tx-mode: v mic = 3 mv/1 khz, s5 = open
U3762MB rev. a1, 15-sep-98 preliminary information 22 (23) packaging information 13040 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
U3762MB preliminary information rev. a1, 15-sep-98 23 (23) ozone depleting substances policy statement it is the policy of temic semiconductor gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( odss). the montreal protocol ( 1987) and its london amendments ( 1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. temic semiconductor gmbh has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2 . class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency ( epa ) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c ( transitional substances ) respectively. temic semiconductor gmbh can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. we reserve the right to make changes to improve technical design and may do so without further notice . parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use temic products for any unintended or unauthorized application, the buyer shall indemnify temic against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. temic semiconductors gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 ( 0 ) 7131 67 2594, fax number: 49 ( 0 ) 7131 67 2423

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