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rev. 4744a?cord?09/03 features speech circuit adjustable dc characteristic symmetrical input of microphone amplifier receiving amplifier for dynamic or piezo-electric earpieces automatic line-loss compensation dialer dtmf/pulse switchable pulse dialing 66/33 or 60/40 or dtmf dialing selectable by pin selectable flashing duration by key pad pause function optical indication of temporary dtmf mode keytone for pulse dialing last number redial up to 32 digits three by 17 digits direct (one-touch) memory ten by 17 digits indirect (two-touch) memory notice function up to 32 digits standard low-cost crystal 3.58 mhz or ceramic resonator handset mute (privacy) with optical indication additional toggle flipflop internal loop interrupt detection tone ringer 2-tone ringer adjustable volume rc oscillator adjustable threshold benefits low number of external components high quality through one ic solution electrostatic sensitive device. observe precautions for handling. description atmel?s low-voltage telephone circuit u3761mb-t performs all the speech and line interface functions required in an electronic telephone set, a tone ringer, a pulse and dtmf dialing with redial, notice function, and 13 memories. operation below 15 ma is possible with reduced performance. universal telephone ic - all functions integrated u3761mb-t
2 u3761mb-t 4744a?cord?09/03 figure 1. block diagram m a s k 2 2 0 f 1 k l e d v i p r i n d m o d e t o k e y b o a r d m a t r i x h k s r o w & c o l u m n p r o g r a m m a b l e c o u n t e r c l o c k g e n e r a t o r r a m l o c a t i o n l a t c h r e a d - w r i t e c o u n t e r c o n t r o l l o g i c p u l s e c o n t r o l l o g i c s u p p l y c u r r e n t r e g u l a t o r k e y - b o a r d i n t e r - f a c e x t 3 . 5 8 m h z k t e a r t h d p d a t a l a t c h & d e c o d e r d / a c o n v e r t e r m u t e c o n t r o l v d d h f i h f o t o g g l e f l i p f l o p m f o m i c 1 m i c 2 - + m i c r o - p h o n e a m p l i f i e r m i c o t i n 2 2 0 n f 2 2 0 n f m p s a 4 2 h k s 1 b x t 2 . 2 n f c l t r a n s m i t a m p l i f i e r c o n t r o l f u n c t i o n s i d e t o n e a m p l i f i e r c o n t r o l f u n c t i o n a g c c u r r e n t g e n e r a t o r r e c e i v e r a t t e n u a t i o n r e c e i v i n g a m p l i f i e r v l s t 3 . 3 n f r e c i n 4 7 n f r e c o 1 2 . 2 f r e c o 2 1 f 1 3 v / 1 w t i p r i n g 7 5 v 4 . 7 v c l o c k s i g n a l o s c i l l a t o r d i v i d e r s u p p l y p o w e r o n r e s e t t o n e s i g n a l g e n e r a t o r d i v i d e r b a n d g a p r e f e r e n c e c o m p a r a t o r w i t h h y s t e r e s i s a g c r d c 1 . 8 k v i 1 0 0 f m u t e m f i n d v r i n g 1 0 f o u t t h a v r i a c c 1 c 2 c 3 c 4 r 1 r 2 r 3 r 4 1 2 3 s m 1 4 5 6 m 2 7 8 9 a m 3 * / t 0 # r / p n f 1 f 2 f 3 e 1 n f r c k 1 5 0 k w 2 n 5 4 0 1 h k s 1 a 1 w 2 . 2 f c l i m 4 7 0 n f t e s t 4 . 7 v v i important note: application examples have not been examined for series use or reliability, and no worst case scenarios have been developed. customers who adapt any of these proposals must carry out their own testing and be convinced that no negative consequences arise from the proposals. n e x t t o v d d a n d g n d 1 8 k 3 3 k 3 k 1 0 0 k 2 2 0 k 4 7 0 5 m 3 3 0 6 8 0 2 . 4 k 3 0 0 1 0 0 1 2 k 3 9 1 0 k 1 0 k
3 u3761mb-t 4744a?cord?09/03 pin configuration figure 2. 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 r4 r3 r2 mask mode kt hks nc 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 c1 xt mfind mic 1 r1 test mic 2 dp u3761mb-t
4 u3761mb-t 4744a?cord?09/03 pin description pin symbol function configuration 1c1 keyboard input 2c2 3c3 4c4 5 earth earth key (604 ms high pulse, 1 s pause) 6hfi toggle flipflop input input with 200 k pull-down resistor hfi triggers hfo with each low/high edge 7 hfo output will be toggled by each low/high edge at hfi c1 vdd vdd vdd vdd c2-c4 pd pd = protection device vdd earth pd hfi vdd vdd pd 2 0 0 k hfo vdd pd
5 u3761mb-t 4744a?cord?09/03 8 9 xt xt a built-in inverter provides oscillation with an inexpensive 3.579545-mhz crystal or ceramic resonator 10 mfo output of dtmf dtmf output frequency specified (hz) actual (hz) error (%) 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 11 mfind during the temporary dtmf mode the output switches to low reset by on hook condition maximum voltage at mfind = 5.5 v 12 gnd ground 13 14 mic 1 mic 2 inverting input of microphone amplifier non-inverting input of microphone amplifier pin description pin symbol function configuration xt vdd vdd vdd vdd xt pd pd mfo vdd vdd pd vdd mfind pd mfind mic2 vi vi mic1 pd pd 1 v 1 v 50k 50k
6 u3761mb-t 4744a?cord?09/03 15 mico transmit pre-amp output which is normally capacitively coupled to pin tin 16 vl positive supply voltage input to the device. the current through this pin is modulated by the transmit signal. 17 rdc an external resistor (1 w) is required from this pin to gnd to control the dc input impedance 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. 18 tin input to the line output driver amplifier. transmit agc applied to this stage. 19 v i this internal voltage bias line must be connected to vl via an external resistor which dominates the ac input impedance of the circuit and should be 680 for an 600- input impedance or 1.2 k for a 900- input impedance. pin description pin symbol function configuration vi 1 v mico pd 16k vl rdc pd pd 16 v rdc agc vl pd pd 1 v tin pd 5.6k 16 v vi pd 16 v
7 u3761mb-t 4744a?cord?09/03 20 mute pin for testing forcing mute to gnd mutes the microphone and decreases the earpiece signal by typically 29 db; no pull up circuit allowed 21 prind privacy indication pin open collector with minimum 1 ma drive current to gnd when privacy = active 22 recin receive amplifier input. the receiving amplification is regulated by an agc. 23 24 reco2 reco1 output of the receive amplifier. dynamic transducers with a minimum impedance of 100 can be directly driven by these outputs. 25 clim time constant of anticlipping in transmit path. clim 2.2 f clim = gnd: anticlipping inactive 26 st the output of the sidetone cancellation signal, which requires a balanced impedance of 8 to 10 times the subscriber?s line impedance to be connected to pin vl. pin description pin symbol function configuration vbg mute pd mute 6.7 v 30k prind vl pd 6.7v recin 60k reco1 reco2 1 v vl pd 60k 6.7 v vl clim idc pd 6 v st pd 16 v
8 u3761mb-t 4744a?cord?09/03 27 tha ringer threshold adjustment 28 agc the range of transmit and receive gain variations 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. 29 vriac ringing supply 30 vring dc supply voltage for the tone ringer is limited to 30 v with integrated z-diode. 31 rck rc clock oscillator for ringer pin description pin symbol function configuration tha vriac 1 v pd 6 v 6 v 12k 20k 140k rdc agc vl pd pd vriac pd 50 v 70k 10k out vring pd pd 30 v 50 v 200 6.5k 3.4 v 0.8 v rck pd 6 v 6 v
9 u3761mb-t 4744a?cord?09/03 32 out buzzer output 33 vdd supply output for dialer part 34 test test input with 6.25 k pull-up resistor 35 nc not connected 36 hks hook switch input hks = 0: on-hook state. chip in sleep mode, no operation (external pull-down resistor recommended) hks = 1: off-hook state. chip enable for normal operation i hks 0.5 ma 37 kt keytone output signal which is sent out in pulse dialing mode with a keytone frequency of 582 hz. kt sink/drive current is about 100 a at v dd = 2.5 v pin description pin symbol function configuration out vring pd pd 30 v 50 v 200 6.5k vl vdd pd 6 v 6 v vdd vdd vdd test pd 6 . 2 5 k hks vdd pd kt vdd vdd pd
10 u3761mb-t 4744a?cord?09/03 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 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 40 mask short mute during pulse dialing, active high during mask an internal npn transistor shortens vl against vi. 41 r1 keyboard input 42 r2 43 r3 44 r4 pin description pin symbol function configuration vdd vdd mode pd dp vdd pd mask vdd pd r1 vdd vdd vdd vdd r2-r4 pd pd
11 u3761mb-t 4744a?cord?09/03 s: store function key a: indirect repertory dialing function key (ln 0 to 9) r/p: redial and pause function key n: notice function */t: * function; pulse-to-tone function m1 to m3: one-touch memory f1, f2, f3: flash keys 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, a, m1, m2, m3, n, * (only tone mode) characters f1, f2, f3, earth, (* in pulse mode) can only be stored in mn, ln and n memory. characters f1, f2, f3, earth, (* in pulse mode) will not be dialled out from redial memory; dialling out was stopped, when recognizing one of the above characters. example: off/ hook, d1, d2, f1, d4, d5, s, s, m1 a) on/off-hook, r/p only d1, d2 will be dialed out, then dialing out stops b) on/off-hook, m1 d1, d2, f1, d4, d5 will be dialed out content of redial memory can be copied to mn, ln, n; but copying memory mn, ln, n to itself or to another memory (except redial memory) will erase the destinated memory. keyboard operation c1 c2 c3 c4 1 2 3 s m1 r1 4 5 6 m2 r2 7 8 9 a m3 r3 */t 0 # r/p n r4 f1 f2 f3 e
12 u3761mb-t 4744a?cord?09/03 example: off/ hook, d1, d2, ... dn a) on/off-hook, r/p, n. d1, ... dn copied to n b) on/off-hook, r/p, s, s, mn (or ln) d1, ... dn copied to mn (or ln) but off/ hook, m1 content of m1 will be dialed out a) on/off-hook, r/p, s, s, m2 not possible, m2 will be erased b) on/off-hook, m1, s, s, m2 not possible, m2 will be erased number store off hook , d1 , d2 , ..., dn , s , s , mn (or ln) 1. d1, d2, ..., dn will be stored in memory location only (not in redial memory) and dialed out. off hook s , d1 , d2 , ..., dn , s , mn (or ln) 2. d1, d2, ..., dn will be stored in memory location but will not be dialed out. 3. r/p and */t keys can be stored as a digit in memory, also f1, f2, f3, earth. in store mode, r/p is the pause function key; */t is the pulse-to-tone function key. 4. the store mode is released after the store function is executed or when the state of the hook switch is changed. 5. number store can be linked without going on/off-hook example: off/hook s, d1, d2, ... dn, s, m1 storing d1, d2, ... dn to m1 s, d1', d2', ... dn', s, m2 ... storing d1', d2', ... dn' to m2 repertory dialing 1. off hook , mn 2. off hook , a , ln notice (n) off hook d1 , d2 , ..., dn , n 1. if the dialing of d1 to dn is finished, pressing the n key will cause d1 to dn to be copied to the n memory. 2. pressing key n again, after d1, d2, ... dn was copied to n, n will be dialed out again off hook , n 3. d1 to dn will be dialed out after the n key is pressed. 4. notice function is valid as first key only. cascaded dialing 1. normal dialing + repertory dialing + normal dialing 2. repertory dialing + normal dialing + normal dialing 3. redialing + normal dialing + repertory dialing 4. redialing is valid as first key-in only.
13 u3761mb-t 4744a?cord?09/03 figure 3. pulse mode normal dialing figure 4. pulse mode auto dialing, t < t ohd 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 r/p m t pdp b t idp m b t idp low oscillation hks key in dp mute mask mfo osc t < t ohd t krd t idp t kid
14 u3761mb-t 4744a?cord?09/03 figure 5. pulse mode auto dialing, t > t ohd figure 6. dtmf 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 t krd t > t ohd t kid 34 5 t kid t krd high oscillation hks key in mute mask osc 2 dtmf t td t itp t itp t itp dp low
15 u3761mb-t 4744a?cord?09/03 figure 7. dtmf mode auto dialing (t < t ohd ) figure 8. dtmf mode auto dialing (t > t ohd ) 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. r/p t kid t krd high oscillation hks key in mute mask osc dtmf t td t itp dp t < t ohd t itp low r/p t kid t krd high oscillation hks key in mute mask osc dtmf t td t itp dp t > t ohd low
16 u3761mb-t 4744a?cord?09/03 figure 9. pause function pulse-to-tone (*/t) off hook , d1 , d2 , ..., dn , */t , d1' , d2' , ..., dn' 1. 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) 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. 4. on/off-hook, r/p d1, d2, dn dialed out, then further dialing out stops and remains in pulse mode, when dialling from redial memory. 5. if characters are stored in mn, ln or n, dialing out will be the same in pulse mode as point 1. low oscillation hks key in dp mute mask mfo osc t kid 2 r/p 3 t pdp t pdp t p t idp
17 u3761mb-t 4744a?cord?09/03 figure 10. pulse-to-tone operation flash (f1 or f2 or f3) off hook , fn 1. the dialer will execute a 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. oscillation hks key in dp mute mask mfo osc t kid 2 */t 3 t pdp t p t idp mfind
18 u3761mb-t 4744a?cord?09/03 figure 11. 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 figure 12. symbolic timing diagram: earth function f t kid oscillation hks key in mute mask osc mfo t fp 3 f t fp t fb t itp high dp key in dp mute mask earth low
19 u3761mb-t 4744a?cord?09/03 figure 13. symbolic timing diagram: hfi, hfo function figure 14. symbolic timing diagram: on hook debounce time figure 15. hks threshold voltage hfi hfo hks xt off hook on hook 165 ms 30 35 40 45 50 55 60 2.0 2.5 3.0 3.5 4.0 4.5 5.0 v dd (v) hks threshold (% of v dd ) switch on switch off
20 u3761mb-t 4744a?cord?09/03 note: esd withstand voltage 1 kv according to esd standard s5.1 (hbm) 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 14 v dc voltage at pins 1 to 11 and 33 to 44 v dc 5.5 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 electrical characteristics: speech circuit reference point pin gnd, f = 1000 hz, 0 dbm = 775 mv rms , r dc = 39 /1 w, t amb = 25c, unless otherwise specified, refer to "basic test circuit". clim = gnd parameters test conditions 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 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 -7 -6 -4.8 db distortion at line v l = 0.775 v rms i l = 20 ma, s5 = open d t 2% maximum output voltage at line d 5% i l = 20 ma, v mic = 10 mv, clim = 2.2 f, s 1 = open v lmax 1.2 dbm attack time transmit anticlipping clim = 2.2 f t att 3.5 ms noise at line weighted psophometrically i l > 20 ma, g s = 48 db 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 t amb = -5 c to +60 c v l -7.6 -4.6 dbm pre-emphasis between high- and low-level frequency group p pre = p hlg - p llg, s5 = closed, t amb = -5 c to +60 c p pre 1.9 2.5 3.1 db total harmonic distortion relative to sum level of low and high frequency group signal il 20 ma, measured at pin mfo thd -33 -25 dbr
21 u3761mb-t 4744a?cord?09/03 receiving amplifier gain i l 20 ma g r 35db 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 dg r -7 -6 -4.7 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 note: output must be limited externally to 5.5 v maximum 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 tr a n s m i t maximum output voltage swing at line i l = 20 ma, v mic =50mv rms v lmax 3.4 4 vpp mute suppression transmit with privacy function i l = 20 ma g spriv 60 db electrical characteristics: speech circuit (continued) reference point pin gnd, f = 1000 hz, 0 dbm = 775 mv rms , r dc = 39 /1 w, t amb = 25c, unless otherwise specified, refer to "basic test circuit". clim = gnd parameters test conditions symbol min. typ. max. unit dc characteristics dialer v dd = 2.7 v, f osc = 3.58 mhz, all outputs unloaded, s9 closed; hks = 1 parameters test conditions symbol min. typ. max. unit memory retention current hks = 0, v dd = 1.0 v i mr 0.1 a data retention voltage 0.5 v dtmf distortion r l = 5 k d-30-23db 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 r kon 5k 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
22 u3761mb-t 4744a?cord?09/03 isolation resistance xt/xt riso 4.7 m maximum voltage at hks 5.5 v maximum input current at hks 0.5 ma dc characteristics dialer (continued) v dd = 2.7 v, f osc = 3.58 mhz, all outputs unloaded, s9 closed; hks = 1 parameters test conditions symbol min. typ. max. unit ac characteristics dialer v dd = 2.7 v, f osc = 3.58 mhz, all outputs unloaded, s9 closed; hks = 1 parameters test conditions 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, 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, 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 inter-tone pause auto dialing, mode = c4 mode = c3 t itp 84 135 87 140 90 147 ms flash break time f1 f2 f3 c 1 connected to gnd c 2 connected to gnd c 3 connected to gnd t fb 95 245 590 98 250 604 101 255 610 ms ms ms rise time of leading edge at hks 20 to 70% of vdd t rhks 10 ms flash pause time f1, f2, f3 t fp 0.911.1s pause time t p 3.5 3.6 3.7 s on-hook debounce time t ohd 145 165 185 ms earth time c 4 connected to gnd t et 604 ms earth pause time t pt 0.911.1s break duration mode pin = r3 mode pin = c1, 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, 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, r3, r4 t p 95 100 105 ms mode pin = r1, r2 (20 pps) t p 50 ms
23 u3761mb-t 4744a?cord?09/03 note: max. current into internal zener diode at pin vring = 20 ma figure 16. turn-off delay time note the oscillator frequency is defined by r and c at pin rck. the audio sequence frequency f 2 and the ratio of low frequency f 1l and high frequency f 1h are derived from the oscillator by internal deviders. so f 2 , f 1h and f 1l are given by: ; ; for more information on adjusting ringer melody refer to the document ?application and adjustment hints?. 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 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 8910v switch-off threshold v riac v roff 5.0 5.6 6.5 v ringing frequency r = 150 k , c = 1 nf v riac > v ron f 1h f 1l 937 752 1010 808 1083 868 hz hz range of external components for r/c oscillator c 1000 2200 pf r50 330k 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 15 t off 65 100 ms 0 0 0 out vriac vring volt melody t off t t t f osc 1 1.594 c r 3809 + ------------------------------------------------------------------- f 2 f osc 320 --------- - = f 1h f osc 4 --------- - = f 1l f osc 5 --------- - =
24 u3761mb-t 4744a?cord?09/03 figure 17. basic test circuit o u t v r i a c v r i n g v m i c t o t e s t e r c l o c k s 7 6 8 n 3 0 0 m v / 1 k h z v g e n 1 2 k 6 0 0 1 . 5 k 2 . 2 n 4 . 7 k v g e n 1 0 0 m v s 5 8 . 2 k 1 2 2 0 n 2 2 0 v d d 2 . 2 3 9 4 7 n 1 0 0 c l 2 5 k 2 5 k s 6 i l 1 0 0 1 3 v 6 2 0 s 1 1 3 . 5 8 m h z s 1 s 8 s 9 1 5 0 k 1 n e a r t h m f i n d m u t e r c k t e s t h f o c 2 g n d r 1 r 2 r 3 r 4 v r i a c m o d e h k s v r i n g v l v i p r i n d t h a s t r e c o 2 r e c o 1 r e c i n r d c a g c c l i m v d d m f o m i c 1 m i c 2 m i c o t i n o u t d p k t c 3 c 4 x t x t c 1 h f i m a s k o u t o u t t o t e s t e r i n o u t i n i n i n i n i / o i n v l v r e c o a b a b t o t e s t e r i / o i n t o t e s t e r i n i n i / o o u t i n i n o u t i n t o t e s t e r i / o t o t e s t e r u 3 7 6 1 m b 3 3 0 2 . 2 1
25 u3761mb-t 4744a?cord?09/03 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 v mic = 3 mv/1 khz, s5 = open 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 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 receiving gain rx-mode: v gen = 300 mv/1 khz, s7b sidetone reduction (in tx-mode) + gr tx-mode: v mic = 3 mv/1 khz, s5 = open input impedance of microphone amplifier tx-mode: vmic = 3 mv/1 khz, s5 = open gain change when muted (mute = inactive) - (mute = active) v gen = 100 mv/1 khz, s5 = open, s8 = open total harmonic distortion (thd) n 1 , ... n n = harmonics of high and low frequency group gs 20 log v l v mic ------------
= gr 20 log v reco v l -----------------
= gsta 20 log v l v reco -----------------
= ri 50 k v l(s6 = closed) v l(s6 = open) --------------------------------- - 1 ?
------------------------------------------------ - = grm 20 log v reco v l -----------------
= 20 log v reco v l -----------------
thd 20 log n 1 u lg 2 n 1 u hg 2 n 2 u lg 2 n 2 u hg 2 ...n n u lg 2 n n u hg 2 + + + + + u lg 2 u hg 2 + ------------------------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------
=
26 u3761mb-t 4744a?cord?09/03 package information ordering information extended type number package remarks u3761mb-tfn sso44 tube u3761mb-tfng3 sso44 taped and reeled 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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