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| telefunken semiconductors U3810BM rev. a1: 19.01.1996 1 (31) multi standard feature phone integrated circuit description the U3810BM multi-standard feature phone circuit is designed to be used with a microcontroller using a 2-wire serial bus. it performs all speech and line interface functions required in an electronic telephone set: the ringing function with switching regulator and melody generator, the dtmf dialling, the loudhearing with antilarsen and antidistortion systems, a power supply, a clock and a reset for the microcontroller. transmit, receive and loudhearing gains control / agc range / dtmf frequencies, pre-emphasis and level / melody generator, and mutes are programmable through the serial bus. block diagramm speech circuit tone ringer lh dtmf dialer mc with eeprom 93 7600 e serial bus loudhearing and tone ringing figure 1 applications feature phones answering machines fax machines benefits complete system integration of analog signal processing and digital control circuitry one ic for various ptt standards, e.g. programmable specification via c only three low-cost transducers needed (instead of four)
telefunken semiconductors U3810BM rev. a1: 19.01.1996 2 (31) features slope of dc characteristics adjustable by an external resistor gain of transmit and receive amplifiers automatically adjusted by line length control regulation range adjustable by the serial bus possibility of fixed gain (pabx) sidetone balancing system adjustable with line length or by the serial bus dynamic impedance adjustable by external components stabilized power supply for peripherals confidence level during dialling +6 db possibility on second stage transmit gain transmit and receive gains adjustable by serial bus extra transmit input for handsfree and answering machine purpose +6 db possibility on receive gain receive amplifier for dynamic or piezo-electric earpieces extra receive output for handsfree purpose high impedance microphone inputs suitable for dynamic, magnetic, piezo-electric or electret microphone distortion of line signal and sidetone prevented by dynamic range limitation in transmission (anti-clipping) squelch system in transmission prevents aroom noiseo are being transmitted, and improves anti-larsen efficiency (can be inhibited). loudhearing gain programmable in eight steps of 4 db, using the serial bus, or linearly adjusted, using a potentiometer anti-larsen system efficiency is increased when inhibiting squelch loudhearing anti-distortion system by automatic gain control versus available current and voltage switching regulator in ringing phase input ringing detection, threshold and impedance adjustable with external resistors ringing zero crossing information for external microprocessor ringing programmable gain in eight steps of 4 db using the serial bus melody generator, with 30 frequencies in steps of semi tones, driven by serial bus internal speed-up circuit permits a faster charge of vdd and vcc capacitor dtmf dialer driven by serial bus, in particular level and pre-emphasis adjustment ability to transmit a confidence tone in speech mode using melody generator frequencies five independent mutes driven by serial bus (two in transmission, two in reception, one for the transmit / receive loop) standard low-cost ceramic 455 khz / clock output for the microcontroller extra loudhearing input for answering machines, handsfree and base station of phones cordless with loudhearing telefunken semiconductors U3810BM rev. a1: 19.01.1996 3 (31) block diagram 94 9329 figure 2 telefunken semiconductors U3810BM rev. a1: 19.01.1996 4 (31) generator ial rx0,1,2,6 tx6 3 9 iagc ibal bal0,1,2 ec squelch anti larsen serial bus anti distortion melody/ vdd vcc gnd reset aga/ sidetone balancing rpi vri impa tad vl sai so1 so2 rref aga zac reco2 reco1 stl reci sts mf lvio co xck esi zco tha cos ios cei rdc mic1 mic2 mico to tin tacl tal d c recox micx vsa dtmf ir isq saix tx0,1,2 ar0,1 at0,1 3 it nea0,1,2 ea amf sin0,1 m0,1,2,3,4 ie2 8 ie1 4 im mis signal path (analog) control path (digital) 94 9330 figure 3 digital adjustment of the analog parameters by the serial bus microprocessor-interface telefunken semiconductors U3810BM rev. a1: 19.01.1996 5 (31) * mic cto* rdtmf2 rdtmf1 racl cacl rstl2 rsts2 rsts3 rstl3 csts2* cstl2* csts3 cstl3 ear cear 470 nf micro controller U3810BM serial bus 1 pulse line- interface l2 l1 vz = 15 v reset zc vdd gnd lvio ce c d c6 c1 c2 c3 c4 c5 key board 2 3 rd 4 pause # 8 0 7 9 5 6 r 7 8 9 10 cso 61.9 k cvsa csai rsai cad cal ral cvdd rad lsc dsc csc vz = 30 v tsc cdtmf1 cdtmf2 rstl1 rsts1 cstl1* csts1 4.7 nf 47 nf 1 2 3 4 5 640 41 42 43 44 vl sai vcc vdd tal tad 11 12 13 14 15 16 17 18 raga2 raga1 rto saix mf sts reci stl cei rdc cvcc vsa recox reco1 reco2 tacl so1 so2 gnd rref cei czac2* 19 20 21 22 23 24 25 26 39 38 37 36 c d co lvio reset 35 34 33 32 31 30 29 28 27 rzac czac1 rin 220 n 200 k 455 khz tin mico to zac mic2 mic1 micx aga rdc xck esi zco tha rpi vri impa cos ios 94 9331 figure 4 application for feature phone telefunken semiconductors U3810BM rev. a1: 19.01.1996 6 (31) typical value of external components components min. typ. max. rin 0.3 m 1.0 m 1.5 m csc 0.1 f tsc 2n5401a lsc 1 mh dsc sd103a rad 100 k cad 470 nf cal 470 nf ral 68 k 82 k cvdd 470 f rsai 20 k csai 0.1 f cvsa 220 f cso 47 f cvcc 100 f raga1 100 k raga2 51 k cei 0.47 f rdc 20 k rto 62 (cto 0.33 f) czac1 0.47 f rzac 12 k components min. typ. max. (czac2 470 pf) rdtmf1 240 k rdmtf2 330 k cdtmf1 4.7 nf cdtmf2 220 pf cacl 0.47 f racl 6.8 m cear 4.7 f earphone 1 k loudspeaker 100 rstl1 6.2 k (cstl1 330 pf) rsts1 6.2 k (csts1 330 pf) rstl2 43 k rsts2 18 k rstl3 100 k rsts3 75 k cstl3 10 nf csts3 10 nf csts2 470 pf cstl2 1.2 nf x1 csb455e (murata) telefunken semiconductors U3810BM rev. a1: 19.01.1996 7 (31) pin description pin symbol function 1 rpi ringing power information. the rc combination smooths the drive current of the loudspeaker amplifier. 2 vri tone-ringer supply voltage. the rectified ringing voltage is delivered to vri and then converted into the lower supply voltage, vsa, by the converter. 3 impa external adjustment of input ringing impedance. impa is adjusted with a resistance between pin 2 and 3. zin = rin/100 4 cos control output switching supply. cos drives the base of the external switching transis- tor of the converter. 5 ios current output of switching supply. this output provides a constant current, which supplies the external part of converter. the magnitude of the current depends on the vri voltage and the value of resistance rin. 6 tad adjustment of antidistortion time constant in loudhearing with external rc combination. 7 tal adjustment of antilarsen time constant in loudhearing with external rc combination. 8 vdd external logic supply. 9 vcc power supply for peripherals. vcc and vdd are stabilized supply voltages buffered with external capacitors. they are derived internally from the same voltage source, but are separated from each other by electronic switches. vdd also supplies the digital part of the circuit and is achieved in all three modes: speech mode, ringing mode and operation with external supply. according to the application, peripherial modules are connected to vdd which, in addition to speech mode, must be supplied at least in one of the two other modes. the digital part of circuit and microprocessor must continue operating during line breaks, as they occur during pulse dialing or during flash-signal transmission. since vdd in this time intervals is fed only from the buffer capacity, the power consumption from vdd must not cause the total voltage dump. vcc supplies no internal parts of circuit and is supplied exclusively in speech mode. external components, which must operate only in this mode, can be connected here. the power is drawn only from the relevant buffer capacitor in the supply intervals during pulse dialing or flash-signal transmission. 10 vl line voltage. 11 sai speaker amplifier input. the signal coming from the receive part, e.g. from rec01 or reco2, is fed in here. 12 saix speaker amplifier input for special application i.e. answering machine. saix is selected via the serial bus. saix has to be selected for ringing. if ringing, antidistor- tion and antilarsen are disabled. 13 vsa supply voltage for the loudhearing amplifier. stabilized supply voltage buffered with an external capacitor for the loudhearing amplifier and zero crossing detector; aditional connection point for an external supply. in speech mode, vsa is supplied by the analog part of the circuit. in this case, the stabilization point is adjusted to the dc line voltage vsa= vl/1.5. in ringing mode, and vsa is supplied directly from the con- verter. the stabilization point is permanently set. the logic supply, vdd, is fed by a switch from vsa. vsa=5.2v. in the case of an external supply, vsa serves as a point for a current from a power supply. the stabilization point of vsa and supply for the logic correspond to the operation conditions in ringing mode. 14 so1 loudspeaker output 1. 15 so2 loudspeaker output 2. differential output of loudhearing amplifier. the loudspeaker can also be connected asymmetrically to ground or to vsa via a capacitor at one of the two outputs. as a result of this connection there is a bigger output power in reference to low line currents and loudspeakers with low impedance, while the differential connection method results in a higher power output and lower harmonic distortion with medium or high line currents and/or loudspeaker impedances telefunken semiconductors U3810BM rev. a1: 19.01.1996 8 (31) pin description pin symbol function 16 gnd ground. 17 rref external reference resistor. connection for external reference resistor to generate the reference current. all basic currents of the circuit which must satisfy certain absolute accuracy requirements depend on this current. 18 cei capacitor for electronic inductance. connection for capacitor of the electronic coil. the circuit contains a first order rc-active low-pass filter. the capacitor is connected externally between cei and vl. 19 rdc dc characteristic slope adjustment. a voltage across resistor rdc is proportional to the dc line voltage. this means the current flow through rdc is also proportional to the line voltage. this current drives the supply currents drawn from vl by the most important loads, and therefore defines the total current consumption of the circuit. adjustment to the slope characteristic is realized by modification of rdc resistance. 20 aga line length adjustment. reference voltage level for aga. the potential at this point defines the start threshold for the aga and the automatic balancing in the receive part (both can be switched off by the serial bus). the potential is normally formed between vcc and ground using a voltage divider. when the line voltage exceeds the threshold level, the aga or balancing becomes effective. 21 micx asymmetrical microphone input for special applications. the input of the first stage of the transmit amplifier, selected by the serial bus. anticlipping is not effective at this input. 22 mic1 inverting input of microphone amplifier. 23 mic2 noninverting input of microphone amplifier. 24 zac ac impedance adjustment. adjustment of the ac circuit impedance to the line by changing of rzac. 25 to transmit amplifier output. transmit amplifier output modulates the current flowing into this output (typically 4.8 ma). 26 mico microphone amplifier output. output mico; open-circuit potential = 2*vbe 27 tin transmit and dtmf input. input of the second transmit stage. 28 tacl adjustment of anticlipping time constant with external rc combination. anticlipping controls the transmitter input level to prevent clipping with high signal levels. the dynamic range of the transmit peak limiter is controlled by an internal circuit. 29 reco2 symmetrical output of receive amplifier. 30 reco1 symmetrical output of receive amplifier. 31 recox receive amplifier output for handsfree and answering machine applications. 32 stl long line sidetone network. 33 reci receive amplifier input. it is driven by a signal from vl. 34 sts short line sidetone network. 35 mf multifrequency output. output dtmf signal and confidence tone in pulsedensity modulated form. dtmf signal and confidence tone are generated by special generators in the digital part of the circuit. the dtmf signal consists of two weighted and superimposed pulse-density modulated signals, while in the case of confidence tone, a pulsedensity modulated signal is superimposed on a high frequency rectangularpulse signal with pulse duty factor 0.5. the superimposed signals are sent out to mf for further processing. 36 d data input of serial bus (see pin 37). serial data input from microprocessor for programming the circuit. telefunken semiconductors U3810BM rev. a1: 19.01.1996 9 (31) pin description pin symbol function 37 c clock line: 2-wire serial bus. this pin is used together with the data input (pin 36) to transfer data from the microprocessor to the circuit. the last 8 bits, consisting of 5 data bits and 3 address bits, are accepted by the circuit if, during the high phase at pin 37, a positive edge on pin 36 takes place. 38 lvio line voltage information output. state indicator of the line voltage, vl, and the supply voltage, vdd. indicates to microprocessor whether line voltage vl is present across the circuit and the supply voltage vdd is sufficiently high. if both conditions are fulfilled, lvio is on high level. 39 co clock output. output 455 khz clock pulse for the microprocessor. the 455 khz clock signal generated in the circuit is amplified and sent to co. this signal is delivered to the microprocessor as a clock signal. various internal signals can be output to co in test mode. 40 reset reset signal for periphery. a reset signal (active low) is generated to clear all registers of the circuit. this can be tapped by peripheral modules, particularly by the micropro- cessor. this pin enables synchronous resetting of the circuit and peripheral modules. 41 xck clock signal generator. connector for ceramic resonator (455 khz). the clock for the digital part of the circuit is generated by a one-pin oscillator, the frequency of which is determined by the ceramic resonator. 42 esi input for external supply information. input to indicate the operating state external supply. in the case of vsa supplied by a power supply unit, the supply source is con- nected directly to esi. esi is connected to vsa by an external diode in forward mode. the esi voltage will be one forward voltage higher than the voltage on vsa. this voltage causes the circuit to be in external supply mode. 43 zco zero crossing output in ringing phase. zco operates when the ringer voltage, vri, and the supply voltage, vsa, are sufficiently high. the output voltage zco changes state each time the rectified ac signal of tha crosses the ringing detect turnon and turn off thresholds, thus providing information on the frequency of the ring signal. further analysis of the ring frequency is be done by the microprocessor. secondly, this pin is used as an input for switching on the test mode. therefore, a negative voltage of approximately 1 v must be applied to pin 43. 44 tha ringing detection threshold adjustment. input amplitude and frequency identification. the rectified ringing voltage is present at this pin. the circuit evaluates the amplitude of the rectified voltage at tha and the supply voltage vsa (pin 13 ). if both voltages exceed certain thresholds, the signal present at tha is converted to a rectangular pulse signal and is sent via pin 43 to the microprocessor. if the frequency is in the required range, the microprocessor initiates transmission of the ringing signal. the start threshold can be raised with a resistor connected in series to pin 44. telefunken semiconductors U3810BM rev. a1: 19.01.1996 10 (31) absolute maximum ratings parameters symbol value unit dc calling voltage (pin 2) vri 35 v dc calling current (pin 2) ir 30 ma conversation line voltage (pin 10) v l 15 17 v v pulse 20 ms conversation line current i l 150 ma total power dissipation *) p tot 1 w operating temperature range t amb 25 to + 55 c storage temperature range t stg 55 to + 150 c junction temperature t j 125 c thermal resistance parameters symbol value unit junction ambient *) r thja 70 k/w electrical characteristics i l = 28 ma, t amb = 25 c, f = 1 khz, r dc = 20 k w, all internal registers cleared, unless otherwise specified c1 l1 r1 c0 94 7894 e figure 5 455 khz ceramic resonator: murata or equivalent refer to the tests circuits resonance factor q m = 3100, l1 = 6.1 mh, c1 = 21 pf, co = 268.5 pf, r1 = 5.5 (schematic above) all resistances are specified at 1%, all capacitances at 2%. parameters test conditions min. typ. max. unit fig. line voltage i l = 15 ma i l = 28 ma i l = 60 ma 4.2 6.7 12.8 4.75 7.2 13.45 5.2 7.5 14.1 v 6 vdd, vcc stabilized power supply i l = 8 ma, idd (icc) = 0.6 ma i l = 28 ma, idd (icc) = 2.3 ma 2.5 3.2 2.65 3.45 3.6 v 6 idd at vdd = 3.5 v internal operating supply current s4 on 3 180 210 a 9 leakage current 100 na speed up off threshold vsoff speed up on line current ison see fig. 11 i lmax = 80 ma v l = 4 v see fig. 14 i l decreasing vdd = 2.8 v 2.45 5.0 2.65 5.9 2.8 7.5 v ma 7 speed up current v l = 4 v 40 70 ma 7 *) note: assembly on pc board 24 cm 2 assumed telefunken semiconductors U3810BM rev. a1: 19.01.1996 11 (31) parameters test conditions min. typ. max. unit fig. transmission transmit gain (note 1) on mic1 / mic2 on micx v mic = 3 mv rms mis tx2 tx1 tx0 max. gain 0 1 1 1 min. gain 0 0 0 0 v micx = 5 mv rms mis tx2 tx1 tx0 max.gain 1 1 1 1 min. gain 1 0 0 0 47.0 39.8 43.0 35.8 48.0 41.0 44.0 37.0 49.0 42.2 45.0 38.2 db db db db 6 gain adjustment of micro- phone amplifier gain change between two steps (both on mic1/mic2 and on micx) 0.8 1.0 1.2 db 6 transmit gain without agc g t at 28 ma g t at i l = 20 to 28 ma g t at i l = 28 to 60 ma v mic = 3 mv rms , bit agc=1 tx2 tx1 tx0 011 011 011 42.6 0.5 0.5 44.0 0.0 0.0 45.5 0.5 0.5 db 6 gain change between 28 and 60 ma on mic1 / mic2 on micx v mic = 3mv rms : at1 at0 (mis = 0) 0 0 01 or v micx = 5 mv rms 10 (mis = 1) 1 1 3.6 4.9 6.3 7.7 4.1 5.35 6.9 8.2 4.6 5.9 7.4 8.7 db 6 +6 db delta transmit gain i l = 28 ma and 60 ma v mic = 1.5 mv rms , bit tx6 = 1 5.4 6.0 6.6 db 6 noise at line psophometrically weighted gt = max. gain v mic = 0 (mis = 0) isq = 0 v mic = 0 (mis = 0) isq = 1 v micx = 0 (mis = 1) isq = 1 79 73 75 70 64 dbmp 6 *max. gain is without + 6 db function which is especially devoted for dtmf muted gain on mic1 / mic2 on micx v mic = 3 mv rms (mis = 0) or v mic = 5 mv rms (mis = 1) (at max. and min. gain) bit im = 1 bit it = 1 v mic = 3 mv rms (mis = 1) or v mic = 5 mv rms (mis = 0) 65 65 60 60 db db db db 6 microphone input impedance on mic1/mic 2 on micx v mic = 3 mv rms (mis = 0) v micx = 5 mv rms (mis = 1) 70 35 110 55 k k 6 cmrr common mode rejection ratio g t = at maximum gain 65 db 6 voltage step on pin 26 when going from transmis- sion to mute mode bit im from 0 to 1 i l =28 ma and 60 ma v mic = 0 (mis = 0) or v micx = 0 (mis = 1) at maximum gain 75 +75 mv 6 dynamic limiter (anti-clipping) cacl = 470 nf, racl = 6.8 m operational only on mic1/mic2 output voltage swing (peak to peak value) tx2 tx1 tx0 111 v mic = 4 mv rms + 10 db 3.3 4.4 v pp 6 delta output voltage swing tx2 tx1 tx0 000 v mic = 9 mv rms + 10 db 200 0 200 mv pp 6 telefunken semiconductors U3810BM rev. a1: 19.01.1996 12 (31) parameters test conditions min. typ. max. unit fig. delta output voltage swing tx2 tx1 tx0 0 0 0 il = 60 ma at1 = at0 = 1 v mic = 22 mv rms + 10 db 200 0 200 mv pp 6 line distortion (on 600 ) tx6 tx2 tx1 tx0 0000v mic = 9 mv rms v mic =9 mv rms +26 db 1111v mic =2 mv rms v mic =2mv rms +26 db i l = 60 ma at0 = at1 = 1 0000v mic = 22 mv rms v mic =22mv rms +24db 2 3 2 3.5 3 3 % % % % % % 6 squelch function cal = 470 nf, ral = 68 k dynamic range attenuation (note 2) i l = 28 ma and 60 ma 8.3 9.3 10.3 db 6 squelch inhibition (tested on gt) g t = g t1 (isq = 1) g t2 (isq = 0) g t1 (v mic = 160 v rms ), g t2 (v mic = 3 mv rms ) at maximum gain 0.3 0 0.3 db 6 vz=17v u3810m 40 1 10 11 12 13 14 15 16 17 18 19 2 20 21 22 23 24 25 26 27 28 3 30 31 32 33 34 35 36 37 38 39 441 42 43 44 5 6 7 8 9 29 il idc 47uf 470uf 600 68k v mic 12k 470nf 270 22uf 47uf 51k 100k 470nf 20k v l 60k 60k v ac serial bus 455khz 22uf 470nf 4.7uf 1k 61.9k 6.2k 6.2k 0.1uf 47nf 4.7nf 6.8 m 470nf 62 4.7nf 220pf 330k 240k 470nf xck esi zco tha rpi impa vri ios cos tacl reco2 reco1 recox stl reset c d mf sts reci rdc mico tin to mic2 mic1 micx aga cei rref so2 so1 saix sai vl tal tad gnd vsa vcc vdd zac co lvio 94 9332 figure 6 test circuit telefunken semiconductors U3810BM rev. a1: 19.01.1996 13 (31) note 1: transmit gain: g t = v l /v mic on mic1/mic2 g t = v l /v mic on micx with the above values of rag1 and rag2 note 2: squelch dynamic range: g t = g t0 g t1 g t0 measured at v mic = 1 mv rms g t1 measured at v mic = 160 v rms gt 12 30 50 ma il 94 7895 e parameters test conditions min. typ. max. unit fig. receive g r receiving gain g r = v r * /v l (for normal output) v gen = 0.3 v rms rx2 rx1 rx0 maximum gain 1 1 1 minimum gain 0 0 0 3.5 3.7 4.5 2.5 5.5 1.3 db db 7 g r = v r /v recox v gen = 0.3 v rms 14.0 15.0 16.0 db 7 gain adjustment at earphone i l = 28 ma and 60 ma attenuation between two steps (both on rec01/rec02 and on recox) 0.8 1.0 1.3 db 7 receiving gain without agc g r = v r /v l g r at 28 ma g r at 20 ma < i l <28ma g r at 28 ma < i l <60ma v gen = 0.3 v rms bit: agc =1 ibal = 1 bits rx2 rx1 rx0 111 111 111 3 0.5 0.5 1.5 0 0 0 0.5 0.5 db db db 7 g r receiving gain betw. 28 and 60 ma on reco1/reco2 and on recox v gen = 0.3 v rms bits ar1 ar0 00 01 10 11 3.6 4.9 6.3 7.5 4.1 5.5 6.9 8.3 4.6 5.9 7.4 8.7 db db db db 7 +6 db delta receiving gain on reco1/reco2 and on recox v gen = 0.3 v rms , i l = 28ma and 60ma (at maximum and minimum gain) bit rx6 = 1 5.6 6.1 6.7 db 7 muted gain v gen = 0.3 v rms mute on rec01/rec02 bit ir=1 bit ie1 = ie2 = 1 recox bit ir=1 65 60 36 db db db 7 noise at earpiece psophometric weighted at maximum gain v gen = 0 v 150 220 vp 7 receiving distortion i l = 28 ma and 60 ma max gain, rx6 = 1 vr = 5 v pp min. gain, rx6 = 0 vr = 2 v pp 1 3 % 7 receiver output impedance on reco1/reco2 (pins 2930) v r = 50 mv rms , 40 65 85 7 receiver output impedance on recox (pin 31) v recox = 50 mv rms 800 950 1100 7 * vr = vreco1 vreco2 telefunken semiconductors U3810BM rev. a1: 19.01.1996 14 (31) parameters test conditions min. typ. max. unit fig. receiver output offset (pin 29 30) i l = 28 ma and 60 ma maximum gain rx6 = 1 800 +600 mv 7 automatic sidetone balancing (v r * /v mic ) at maximum gain v mic = 4 mv rms i l = 28 ma i l = 60 ma 24 16 db db 6 digital balanced sidetone tested on receiving gain v r /v l v gen = 0.3 v rms maximum gain close switch s1 bit ibal = 1 bits bal2 bal1bal0 000 001 010 011 101 110 111 18.0 16.9 15.5 4.2 19.0 17.9 16.5 14.5 12.3 9.2 5.7 20.0 18.9 17.5 7.2 db db db db db db db 7 confidence level attenuation v mic = 2 mv rms bit i r = 1 60 db 6 confidence level gain v r /v mic v mic = 2 mv rms i r = 1 ec = 1 19.5 22.0 23.5 db 6 z line match. impedance v gen = 0.3 v rms i l = 28 and 60 ma 520 570 620 7 vz=17v U3810BM s1 v gen 40 1 10 11 12 13 14 15 16 17 18 19 2 20 21 22 23 24 25 26 27 28 3 30 31 32 33 34 35 36 37 38 39 441 42 43 44 5 6 7 8 9 29 ve3 47uf sin idc vl 470uf 62 600 470nf 270 47uf 51k 100k 470nf 20k il serial bus xck esi zco tha rpi impa vri ios cos tacl reco2 reco1 recox stl reset c d mf sts reci rdc mico tin to mic2 mic1 micx aga cei rref so2 so1 saix sai vl tal tad gnd vsa vcc vdd zac co lvio 455khz 470nf 470nf 47nf 12k 61.9k 6.2k 6.2k 0.1uf 60k 60k 68k 4.7nf 6.8m 470nf 4.7uf 1k 94 9333 10k 4.7uf figure 7 test circuit telefunken semiconductors U3810BM rev. a1: 19.01.1996 15 (31) parameters test conditions min. typ. max. unit fig. speaker amplifier vsa shunt regulator power supply (pin 13) in transmission mode speaker amplifier without signal ea = 1 il = 28 ma il = 60 ma 4.0 7.85 4.3 8.3 4.6 8.7 v v 8 loudhearing gain (note3) from sai/saix to so1, so2 gsa1 vso1vso2 vsai gsa2 vso1vso2 vsaix bits nea2 nea1 nea0 vsai = vsaix 1 1 1 vsai=3.5mv rms 0 0 0 vsai = 88 mv rms ea = 1 33 5 34 6 35 7 db db 8 loudhearing gain between 28 and 60 ma gsa1 and gsa2 (note 3) ea = 1 0.5 0 0.5 db 8 gain adjustment of speaker amplifier ea = 1 gain change between two steps 3.8 4.0 4.2 db 8 distortion (measured on 100 w load) ea = 1 bits nea2 nea1 nea0 vsai 111 vsai = 12 mv rms vsai = 30 mv rms 000 vsai = 250 mv rms bits ea = 1 i l = 60 ma nea2 nea1 nea0 111 vsai = 80 mv rms 000 vsai = 250 mv rms 2.0 4.0 1.5 2.0 2.0 % % % % % 8 input impedance sai saix ea = 1 4 4 7 7 10 10 k 8 confidence gain in loud- hearing v mic = 4 mv vso ea = 1 v mic ec = 1, ital = 1 36 40 db 8 loudhearing input cross talk attenuation nea = 7 ea = 1 vsai =12 mv rms lis = 1 vsaix = 12 mv rms lis = 0 60 60 db db 8 output power (note 4, 6) 50 load asym. ea =1 i l = 20 ma 100 load sym. i l = 28 ma 50 load asym. 100 load sym. i l = 60 ma 50 load asym. 100 load sym. 9.0 19.0 140 12,5 11,5 24 30 120 170 mw mw mw mw mw 8 output offset (pin 14 15) lis = 0, 1 ea = 1 max. and min. gain 200 +200 mv 8 leakage current (pin 6) ea = 1 140 na 8 offset (pin 7) ral = 68 k i l = 28 ma and 60 ma ea = 1 140 mv 6 antilarsen system cal = 470 nf, ral = 68 k dynamic range attenuation (note 5) il = 28 ma and 60 ma ea = 1 vsai = 6 mv rms bit isq = 0 bit isq = 1 11 23 12 26 13 29 db db 8 telefunken semiconductors U3810BM rev. a1: 19.01.1996 16 (31) vz=17v s2 U3810BM 40 1 10 11 12 13 14 15 16 17 18 19 2 20 21 22 23 24 25 26 27 28 3 30 31 32 33 34 35 36 37 38 39 441 42 43 44 5 6 7 8 9 29 idc 47uf 470uf 270 22uf 470nf 470nf 600 470nf 220uf 100 47uf 51k 100k 470nf 20k vso 47uf vl il 68k 60k 60k serial bus xck esi zco tha rpi impa vri ios cos tacl reco2 reco1 recox stl reset c d mf sts reci rdc mico tin to mic2 mic1 micx aga cei rref so2 so1 saix sai vl tal tad gnd vsa vcc vdd zac co lvio 455khz 470nf 470nf 4.7uf 470nf 6.8 m 1k 47nf 4.7nf 12k 62 61.9k 6.2k 6.2k 0.1uf 22uf v mic 100k 94 9334 22nf figure 8 test circuit note 3: gsa1 measured with s2 on 11 gsa2 measured with s2 on 12 and bit lis = 1 note 4: antilarsen dynamic range: gls = glsa glsb glsa measured at v mic = 160 v rms glsb measured at v mic = 1 mv rms note 5: the available output current of the speaker amplifier can be increased by reduction of the quiescent current of the receiver output stage ( bits ie1, ie2, see acontents of internal registerso ). dtmf dialing the output pin mf provides the multifrequency signal to be transmitted on line. this signal is the result of the sum of two frequency pulse modulations and requires an external filter to compose a dual sine wave. the frequencies are chosen in a low group and a high group. the circuit conforms to the t/cs 4602 cept recommendation concerning dtmf option 1 (9/11 dbm) and option 2 (6/8 dbm) transmit level 5 (example: in fig. 6, option 2 can be fulfilled with 3.5 db preemphasis and 1.5 vpp low frequency level pin 35). two different low levels (with 3 db difference) and two different preemphasis (2.5 and 3.5 db) can be chosen through the serial bus. melody confidence tone melody/confidence tone frequencies are given in table 2. in the state sin1 = 1, sin0 = 0, the ic delivers a single pulse density modulated frequency at pin mf (the same behavior as dtmf), denoted as a confidence tone. the confidence tone is sent either to the line or on the earpiece.in the state sin1 = 0, sin0 = 1, a square wave is sent to the loudhearing input for ringing melodies. telefunken semiconductors U3810BM rev. a1: 19.01.1996 17 (31) table 1: frequency tolerance of the output tones for dtmf signalling tone output frequency when using 455 khz standard frequency hz tone output frequency frequency deviation hz frequency hz % hz low group 697 770 852 941 high group 1209 1336 1477 1633 697.85 771.18 852.06 940.08 1210.1 1338.2 1477.3 1636.7 0.12 0.15 0.01 0.10 0.09 0.17 0.02 0.22 +0.85 +1.18 +0.06 0.92 +1.1 +2.2 +0.3 +3.7 note: frequency can be directly measured on co when s3 is closed (figure 9) amf sin0 sin1 co 1 1 1 dtmf : hf 0 1 1 dtmf : lf 0 1 0 melody 0 0 1 confidence tone 1209 1336 1477 1633 697 1 2 3 a 770 4 5 6 b 852 7 8 9 c 941 * 0 # d telefunken semiconductors U3810BM rev. a1: 19.01.1996 18 (31) standard frequency hz tone output frequency hz frequency deviation 0 / 00 440 466.16 493.88 523.25 554.36 587.33 622.25 659.25 698.46 740 784 830 880 932.3 987.77 1046.5 1108.73 1174.66 1244.5 1318.5 1396.9 1480 1568 1661.2 1760 1864.65 1975.5 2093 2217.46 2349.3 440.04 466.19 493.49 522.99 554.88 587.86 621.58 659.42 697.85 741.04 784.48 830.29 878.38 932.38 989.13 1048.39 1109.76 1172.68 1243.17 1315.03 1395.71 1477.27 1568.97 1660.58 1763.57 1864.75 1978.26 2087.16 2208.74 2345.36 0.09 0.06 0.78 0.50 0.92 0.89 1.07 0.26 0.87 1.41 0.62 0.37 1.84 0.08 1.38 1.80 0.93 1.69 1.07 2.63 0.86 1.84 0.62 0.37 2.03 0.06 1.40 2.79 3.93 1.68 table 2: frequency tolerance of the output tone tone output frequency when using 455 khz parameters test conditions min. typ. max. unit fig. dtmf generation (specified pin mf) tone frequency accuracy see table 1 low group tone level without attenuation note 7 bfoa (pre-emphasis a) s3 closed bfob (pre-emphasis b) 1.35 1.25 1.50 1.40 1.65 1.55 v v 9 high group tone level without attenuation note 7 hfoa (pre-emphasis a) s3 closed hfob (pre-emphasis b) 1.80 1.90 2.00 2.10 2.20 2.35 v v 9 pre-emphasis a without attenuation note 7 proa s3 closed 2.04 2.54 3.04 db 9 pre-emphasis b without attenuation note 7 prob s3 closed 3.02 3.52 4.02 db 9 low group tone level with attenuation note 7 bf1a (pre-emphasis a) s3 closed bf1b (pre-emphasis b) 0.95 0.90 1.05 1.00 1.15 1.10 v v 9 high group tone level with attenuation note 7 hf1a (pre-emphasis a) s3 closed hf1b (pre-emphasis b) 1.25 1.35 1.40 1.50 1.55 1.65 v v 9 telefunken semiconductors U3810BM rev. a1: 19.01.1996 19 (31) parameters test conditions min. typ. max. unit fig. pre-emphasis a with attenuation note 7 pr1a s3 closed 2.04 2.54 3.04 db 9 pre-emphasis b with attenuation note 7 pr1b s3 closed 3.02 3.52 4.02 db 9 leakage s4 = 2 bits sin1 sin0 s3 closed 0 0 100 100 na 9 distortion at line il = 28 ma m = 8 key = ?3? tx6 = 1 im = 1 1 3 % 6 low group tone level at line il = 28 ma and 60 ma m = 8 key = ?3? tx6 = 1 im = 1 10 8 6 dbm 6 melody generation tone frequency accuracy see table 2 confidence tone level note: 7 ctl 2.10 2.33 2.60 v 9 U3810BM s4 vtm 3.5v 455 khz s3 1.4v 40 1 10 11 12 13 14 15 16 17 18 19 2 20 21 22 23 24 25 26 27 28 3 30 31 32 33 34 35 36 37 38 39 441 42 43 44 5 6 7 8 9 29 xck esi zco tha rpi impa vri ios cos tacl reco2 reco1 recox stl reset c d mf sts reci rdc mico tin to mic2 mic1 micx aga cei rref so2 so1 saix sai vl tal tad gnd vsa vcc vdd zac co lvio serial bus 3 0 1 2 a + a + 94 9335 figure 9 test circuit telefunken semiconductors U3810BM rev. a1: 19.01.1996 20 (31) internal registers set by serial bus internal signal set by clock count s4 (fig. 9) amf sin1 sin0 m4 fb fh f227 i measured 0 0 1 1 0 1 0 x i1 0 0 1 1 0 0 1 x i2 0 0 1 1 1 0 1 x i3 0 0 1 0 0 0 x 1 i4 0 1 1 1 x 0 0 1 i5 1 0 1 1 1 0 1 x i6 1 0 1 1 0 1 0 x i7 1 0 1 1 1 1 0 x i8 1 0 1 0 x 1 x 0 i9 1 1 1 1 x 1 1 0 i10 x: either 1 or 0 note 7: dtmf calculations bf level without attenuation with pre-emphasis a: bf level without attenuation with pre-emphasis b: hf level without attenuation with pre-emphasis a: hf level without attenuation with pre-emphasis b: pre-emphasis a without attenuation: pre-emphasis b without attenuation: bf level with attenuation with pre-emphasis a: bf level with attenuation with pre-emphasis b: hf level with attenuation with pre-emphasis a: hf level with attenuation with pre-emphasis b: pre-emphasis a without attenuation: pre-emphasis b without attenuation: confidence tone level: bfoa i1 i1 i7 i6 i6 i2 vdd 2 bfob i1 i1 i8 i6 i6 i3 vdd 2 hfoa i2 i2 i6 i7 i7 i1 vdd 2 hfob i3 i3 i6 i8 i8 i1 vdd 2 proa 20 log hfoa bfoa prob 20 log hfob bfob bf1a i1 i1 i7 i10 i6 i6 i2 i5 vdd 2 bf1b i1 i1 i8 i10 i6 i6 i3 i5 vdd 2 hf1a i2 i2 i6 i10 i7 i7 i1 i5 vdd 2 hf1b i3 i3 i6 i10 i8 i8 i1 i5 vdd 2 pr1a 20 log hf1a bf1a pr1b 20 log hf1b bf1b ctl i1 i1 i9 i6 i6 i4 vdd 2 telefunken semiconductors U3810BM rev. a1: 19.01.1996 21 (31) parameters test conditions min. typ. max. unit fig. ringer tha threshold voltage thtv v s = 5 v s5 on 1 8.30 8.75 9.20 v 10 tha hysteresis th v s = 5 v s5 on 1 435 465 495 mv 10 vsa threshold voltage vsaon (ring detector en- abled) vtha = 12 v s5 on 1 3.0 3.2 3.4 v 10 vsa threshold voltage vsaoff (ring detector dis- abled) vtha = 12 v s5 on 1 2.45 2.5 2.65 v 10 switching supply output current vs = 5 v vin = 30 v s7 on 1 s5 on 1 rin = 300 k 33 37 ma 10 input impedance vin/iin s5 on 1 vs = 5 v s7 on 1 off state vin = 5 v rin = 300 k on state vin = 30 v rin = 300 k on state vin = 30 v rin = 1500 k 50.0 2.78 13.4 2.90 14.1 3.05 15.0 k k k 10 rpi ringing power information rin = 300 k s7 on 2 s5 on 2 vin = 30 v vesi = 0 v s5 on 1 vin = 0 v vesi = 5 v 1.48 1.57 1.55 1.61 1.64 1.64 v v 10 vsa/vdd switch off vsa- off1 (measured on vsa) s8 closed s5 on 1 ivdd = 1 ma 5.55 5.8 6.0 v 10 vsa shunt regulator vsal vsah s5 on 3 isa = 2 ma isa = 45 ma 4.75 5.0 5.0 5.3 5.15 5.7 v v 10 difference between max. vsa voltage and cut off voltage vsadiff = vsaoff1 vsah 250 500 mv 10 zco zero crossing information vs = 5 v s5 on 1 s6 closed izco = 100 a vtha = 7.5 v izco = 100 a vtha = 12.0 v 4.4 0.5 v v 10 ringer output power (on 100 load) vin = 30 v rin = 300 k s7 on 2 s5 on 2 sin1 sin0 lis ea 0111 nea maximum gain 70 105 130 mw 10 extra ringing attenuation vin = 30 v rin = 300 k s7 on 2 s5 on 2 sin1 sin0 lis amf ea 01111 nea maximum gain 12.8 12.2 11.6 db 10 telefunken semiconductors U3810BM rev. a1: 19.01.1996 22 (31) s5 s7 5v s8 s6 U3810BM sd103a rin 2n5401a vs isa 40 1 10 11 12 13 14 15 16 17 18 19 2 20 21 22 23 24 25 26 27 28 3 30 31 32 33 34 35 36 37 38 39 441 42 43 44 5 6 7 8 9 29 ivdd 1mh 3 2 1 470nf 100k 220uf 2 1 serial bus xck esi zco tha rpi impa vri ios cos tacl reco2 reco1 recox stl reset c d mf sts reci rdc mico tin to mic2 mic1 micx aga cei rref so2 so1 sai sai vl tal tad gnd vsa vcc vdd zac co lvio a + 455khz 470uf 200k 47uf 100 vso 0.1uf vesi vtha vin izc 94 9336 figure 10 test circuit 937608 telefunken semiconductors U3810BM rev. a1: 19.01.1996 23 (31) electrical characteristics of logical part f xck = 455 khz vdd = 3.5 v parameter min. typ. max. unit inputs : c, d low-voltage input vil high-voltage input vih input leakage current ii (0 < vi < vdd) 2.8 1 0.7 1 v v a output: reset, co, lvio low-voltage output (iol = 100 a) vol high-voltage output (ioh = 100 a) voh 3.1 0.35 v v clock: co (fig. 15) using reference ceramic resonator period: t cyc high pulse width: t wch 2.19 1.10 2.20 2.21 1.45 s s serial bus (figure 19) data setup time t sud data hold time t hd clock low time t cl clock high time t ch hold time before transfer condition t eon data low pulse on transfer condition t eh data high pulse on transfer condition t eoff 0.1 0 2 2 0.1 0.2 0.2 s s s s s s s reset timing (figure 11, 12 and 13) clock start-up time t on clock inhibition time t off reset time (without t on )t r 70 30 3 31.6 5 150 32 ms s ms telefunken semiconductors U3810BM rev. a1: 19.01.1996 24 (31) power-on-reset and reset pin the system (U3810BM + microcontroller) is woken up by an initial condition: line voltage (vl) ringer (tha) external supply (esi) to avoid undefined states of the system when it is powered on, an internal reset clears the internal registers, and maintains pin reset low during trt. 1.) power on in speed-up condition (vdd < vson) line lvio shutdown vdd co resetn 937609 figure 11 2.) power on without speed-up (vdd > vson) line lvio shutdown vdd co resetn 937610 figure 12 telefunken semiconductors U3810BM rev. a1: 19.01.1996 25 (31) 3.) line break 937611 livo line shutdown vdd co resetn figure 13 when the microprocessor detects livo low during t > t p (internal microprocessor timing special for line breaks), it forces high the shutdown bit through the serial bus, thus leading the ic, after t off , to go into standby mode (oscillator stop). pin reset remains high. when the line break is shorter than t p, nothing appears. 4.) line current fall 937612 livo line shutdown vdd co reset figure 14 telefunken semiconductors U3810BM rev. a1: 19.01.1996 26 (31) clock output telefunken semiconductors U3810BM rev. a1: 19.01.1996 27 (31) serial bus interface 8 bits register analog commands data clock 937616 figure 18 937615 figure 19 content of internal registers 0: transmission mode mis tx6 tx2 tx1 tx0 mis: microphone input switching tx6: +6db tx: transmission gain adjustment 1: reception mode lis rx6 rx2 rx1 rx0 lis: loudhearing input switching rx6: +6db rx: reception gain adjustment telefunken semiconductors U3810BM rev. a1: 19.01.1996 28 (31) 2: loudhearing mode ial ea nea2 nea1 nea0 ial: antilarsen inhibition ea: loudhearing enable nea: loudhearing gain adjustment 3: agc mode iagc ar1 ar0 at 1 at 0 iagc: agc inhibition at: transmission agc adjustment ar: reception agc adjustment 4: sidetone mode ie2 ibal bal2 bal1 bal0 ie2: reception output amplifier current adjustment ibal: inhibition of automatic sidetone balance bal z 0 1 2 3 4 5 6 7 1 sts 5/6 sts + 1/6 stl 2/3 sts + 1/3 stl 1/2 sts + 1/2 stl 1/2 sts + 1/2 stl 1/3 sts + 2/3 stl 1/6 sts + 5/6 stl 1 stl 5: internal inhibitions ir ec it im ie1 ir: reception inhibition ec: confidence enable it: transmit inhibition im: microphone inhibition ie1: reception output amplifier current adjustment ie1 ie2 irec 0 0 1 1 0 1 0 1 3 ma 2 ma 1 ma 0 ma earpiece inhibition 6: melody / dtmf choice m4 m3 m2 m1 m0 telefunken semiconductors U3810BM rev. a1: 19.01.1996 29 (31) m melody or confidence tone out - dtmf mode m melody or confidence tone out - put key hf/lf 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f a3 a#3 b3 c4 c#4 d4 d#4 e4 f4 f#4 g4 g#4 a4 a#4 b4 c5 c# d5 d#5 e5 f5 f#5 g5 g#5 a5 a#5 b5 c6 c#6 d6 440.0 466.2 493.5 523.0 554.9 587.8 621.6 659.4 697.8 741.0 784.5 830.3 878.4 932.4 989.1 1048.4 1109.7 1172.7 1243.2 1315.0 1395.7 1477.3 1569.0 1660.6 1763.6 1864.7 1978.3 2087.2 2208.7 2345.4 ?1? ?4? ?7? ?*? ?2? ?5? ?8? ?0? ?3? ?6? ?9? ?#? ?a? ?b? ?c? ?d? ?1? ?4? ?7? ?*? ?2? ?5? ?8? ?0? ?3? ?6? ?9? ?#? ?a? ?b? ?c? ?d? 2.5 db o o o o o o o o o o o o o o o 3.5 db o o o o o o o o o o o o o o o table 3 7: control register amf isq sd sin1 sin0 amf: mf output attenuation 3 db extra ringing attenuation (12 db) isq: squelch inhibition sd: shutdown sin: generator mode 0: off 1: melody (ringer) 2: confidence tone 3: dtmf order information package type plcc 44 U3810BM-cp sso 44 U3810BM-fn electrostatic sensitive device. observe precautions for handling. telefunken semiconductors U3810BM rev. a1: 19.01.1996 30 (31) dimensions in mm package: plcc 44 package: sso 44 94 8888 telefunken semiconductors U3810BM rev. a1: 19.01.1996 31 (31) ozone depleting substances policy statement it is the policy of temic telefunken microelectronic gmbh to 1. meet all present and future national and international statutory requirements and 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. of particular concern is the control or elimination of releases into the atmosphere of these substances which are known as ozone depleting substances ( odss). the montreal protocol ( 1987) and its london amendments ( 1990) will 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 telefunken microelectronic gmbh semiconductor division has been able to use its policy of continuous improvements to eliminate the use of any odss listed in the following documents that all refer to the same substances: ( 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 and ( 3 ) council decision 88/540/eec and 91/690/eec annex a, b and c ( transitional substances ) respectively. temic can certify that our semiconductors are not manufactured with and do not contain ozone depleting substances. we reserve the right to make changes to improve technical design 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 telefunken microelectronic gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 ( 0 ) 7131 67 2831, fax number: 49 ( 0 ) 7131 67 2423 |
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