rev. 4742a?cord?09/03 features dc characteristic adjustable receive gain adjustable symmetrical input of microphone amplifier anti-clipping in transmit direction automatic line-loss compensation symmetrical output of earpiece amplifier built-in ear protection dtmf and mute input adjustable sidetone suppression independent of sending and receiving amplification power down tone-ringer interface 2-bit d/a for volume control supply voltages for all functional blocks of a subscriber set operation possible from 8-ma line currents applications telephone sets benefits complete system integration of analog signal processing on one chip very few external components description the microcontroller-controlled telephone circuit U4037B-N is a linear integrated circuit for use in telephone sets. it contains the speech circuit, tone-ringer interface, sidetone equivalent and ear-protection rectifiers. the circuit is line powered and contains all components necessary for amplification of signals and adaptation to the line. figure 1. block diagram micro- controller power supply speech circuit tone ringer pwr microcontroller- controlled speech and ringer circuit U4037B-N
2 U4037B-N 4742a?cord?09/03 pin configuration figure 2. pinning so24 1 2 3 4 5 6 7 8 10 9 23 18 17 16 14 15 13 12 11 24 21 22 19 20 vol1 mu/vol2 mel pd vmp vring aga dtmf out2 txacl st mico recin vb imp gnd vl ind reco1 rif out1 reco2 mic1 mic2
3 U4037B-N 4742a?cord?09/03 pin description pin symbol function 1 mico output of microphone preamplifier 2 st sidetone reduction input, input resistance is approximately 25 k 3 txacl time constant of anti-clipping in transmit path 4 aga automatic gain adjustment with line current, a resistor connected from this pin to gnd sets the starting point maximum gain change: 6 db 5 dtmf input for dtmf signals 6 vol1 2-bit volume adjustment for tone ringer 7 mu/vol2 1) 2-bit volume adjustment for tone ringer 2) mute of microphone amplifier: - speech condition, input mu/vol2 low - dtmf condition input mu/vol2 high dtmf signal at pin 5 is fed to the line. a part of the dtmf signal is passed to the receiving amplifier as a confidence signal during dialing 8 mel input for melody 9 pd active high input for reducing the current consumption of the circuit, v l simultaneously is shorted by an internal switch 10 vmp 3.4 v regulated supply voltage for peripheral circuits (especially microprocessors), minimum output current: 2 ma (ringing), 4 ma (speech mode) 11 vring input for ringer supply voltage 12 out2 differential output for tone ringer 13 out1 14 ind the internal equivalent inductance of the circuit is proportional to the value of the capacitor at this pin, a resistor connected to ground may be used to reduce the dc line voltage 15 vl line voltage 16 gnd reference point for dc- and ac-output signals 17 imp impedance adjustment 18 vb unregulated supply voltage for peripheral circuits (voice switch), limited to typically 7 v 19 recin receiver input 20 rif pin for adjustment of frequency response and gain of receiver 21 reco1 output of receiving amplifier 22 reco2 inverting output of receiving amplifier 23 mic1 inverting input of microphone amplifier 24 mic2 non-inverting input of microphone amplifier
4 U4037B-N 4742a?cord?09/03 figure 3. detailed block diagram with external components p o w e r d o w n c o n t r o l v m p r e g 1 m i c 1 m i c 2 v m p d t m f t x a c l t x a c l m i c o s t r a r e c o 1 r e c o 2 a g a t x a d c - m a s k a n d s u p p l y a g a p d r e c i n v l i m p i n d g n d v r i n g v o l u m e c o n t r o l b u z a v m p r e g 2 o u t 1 v o l 1 m u / m e l v b v m p 4 7 1 0 0 0 t o m i c r o c o n t r o l l e r t i p r i n g m i c r o - c o n t r o l l e r v m p + - r i f o u t 2 1 0 k 4 . 7 n 5 1 k 5 . 6 n 2 0 k 1 k 1 0 k 1 5 k 1 k 1 2 k 6 . 8 n 6 . 8 n 3 . 3 n 1 2 3 k 2 0 k 5 6 0 1 0 0 n 3 3 n 5 0 5 0 3 3 k 1 n 2 2 0 n 1 0 1 0 1 0 1 m 1 6 v 2 0 0 k 1 3 0 k 1 0 1 0 n 1 2 v 3 . 3 m v a l u e d e p e n d s o n t h e a p p l i c a t i o n v o l 2 * * ** * ** * * * *
5 U4037B-N 4742a?cord?09/03 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 i ring 15 ma junction temperature t j 125 c ambient temperature t amb -25 to +75 c storage temperature t stg -55 to +150 c total power dissipation, t amb = 60 cp tot 520 w thermal resistance parameters symbol value unit junction ambient r thja 75 k/w electrical characteristics f = 1 khz, 0 dbm = 775 mv rms , i mp = 2 ma, t amb = 25 c, z ear = 68 nf + 100 , z m = 68 nf, unless otherwise specified parameters test conditions symbol min. typ. max. unit dc characteristics dc voltage drop over circuit i l = 2 ma i l = 14 ma i l = 60 ma i l = 100 ma v l 4.6 8.8 2.4 5.0 7.5 9.4 5.4 10.0 v transmission amplifier, i l = 14 ma, v mic = 2 mv, unless otherwise specified transmitting amplification g t 47 48 49 db frequency response i l 14 ma f = 300 to 3400 hz g t 0.5 db gain change with current i l = 14 to 100 ma g t 0.5 db gain deviation t amb = -10 to +60 c g t 0.5 db cmrr of microphone amplifier cmrr 60 80 db input resistance of mic amplifier r i 50 k distortion at line i l > 14 ma v l = 700 mv rms d t 2% maximum output voltage i l > 19 ma, d < 5% v mic = 10 mv ctxa = 1 f v lmax 1.8 3 4.2 dbm 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 line-loss compensation i l = 100 ma, raga = 20 k g ti -6.4 -5.8 -5.2 db
6 U4037B-N 4742a?cord?09/03 mute suppression i l 14 ma g tm 60 80 db receiving amplifier, i l = 14 ma, unless otherwise specified, v gen = 300 mv receiving amplification g r 12 db adjustment range g r -8 12 db amplification of dtmf signal from dtmf in to reco 1, 2 i l 14 ma v dtmf = 8 mv g rm 14 20 db frequency response i l > 14 ma f = 300 to 3400 hz g rf 0.5 db gain change with current i l = 14 to 100 ma g r 0.5 db gain deviation t amb = - 10 to + 60 c g r 0.5 db ear protection differential i l 14 ma v gen = 11 v rms ep 2.2 v rms mute suppression i l 14 ma g r 60 db output voltage d 2% differential i l = 14 ma, z ear = 68 nf + 100 0.775 v rms output voltage d 5% differential i l = 14 ma z ear = 68 nf + 100 rdc = infinite 1.2 v rms receiving noise psophometrically weighted z ear = 68 nf + 100 i l 14 ma ni -64 dbmp output resistance each output against gnd ro 40 line-loss compensation raga = 20 k i l = 100 ma g ri -7.0 -6.0 -5.0 db gain at low operating current i l = 8 ma, i mp = 1 ma i m = 300 a v gen = 100 mv rdc = 68 k g r 10.5 12 13.5 db dtmf-amplifier test conditions: imp = 2 ma dtmf amplification i l = 15 ma v dtmf = 8 mv mute active g d 40.7 41.7 42.7 db gain deviaton i l = 15 ma t amb = -10 to +60 c g d 0.5 db input resistance rgt = 15 k r i 15 20 25 k distortion of dtmf signal i l 15 ma v l = 0 dbm d d 2% gain deviation with current i l = 15 to 100 ma gd 0.5 db supply voltages, v mic = 10 mv, t amb = -10 to +60 c v mp i l = 8 ma rdc = 130 k i mp = 1 ma v mp 3.1 3.4 3.6 v ringing part, i vmp = 1 ma maximum output voltage v ring = 20 v v out 25 v pp electrical characteristics (continued) f = 1 khz, 0 dbm = 775 mv rms , i mp = 2 ma, t amb = 25 c, z ear = 68 nf + 100 , z m = 68 nf, unless otherwise specified parameters test conditions symbol min. typ. max. unit
7 U4037B-N 4742a?cord?09/03 input impedance in speech mode f = 300 hz to 3400 hz i l > 15 ma v tip/ring = 1.5 v rms r i 50 k ringing part: ringer output voltage f = 25 hz, c buz = 50 nf v tip/ring = 63 v rms v out 28 v pp v tip/ring = 45 v rms v out 18 v pp v tip/ring = 25 v rms v out 7v pp volume adjustment steps 11 10 01 00 0 -6 -12 -24 db zener diode voltage i ring = 25 ma v ringmax 28.5 v 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 pd = active, i l = 14 ma i l = 100 ma v l v l 1.5 1.9 v internal current comsumption at v b v b = 3.5 v pd = active, i l = 0 ma i b 300 a electrical characteristics (continued) f = 1 khz, 0 dbm = 775 mv rms , i mp = 2 ma, t amb = 25 c, z ear = 68 nf + 100 , z m = 68 nf, unless otherwise specified parameters test conditions symbol min. typ. max. unit
8 U4037B-N 4742a?cord?09/03 package information ordering information extended type number package remarks U4037B-Nfl so24 ? U4037B-Nflg3 so24 taped and reeled technical drawings according to din specifications package so24 dimensions in mm 15.55 15.30 2.35 0.4 1.27 13.97 9.15 8.65 0.25 0.10 7.5 7.3 0.25 10.50 10.20 24 13 112
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