U4092B

TELEFUNKEN Semiconductors U4092B Monolithic Integrated Feature Phone Circuit Description The µc controlled telephone circuit U4092B is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with dc/dc converter, 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. An integrated voice switch with loudspeaker amplifier allows loudhearing or handsfree operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits. Features D D D D D D D D D D D D D D DC characteristic adjustable Transmit and receive gain adjustable Symmetrical input of microphone amplifier Anti-clipping in transmit direction Automatic line loss compensation Built-in ear protection DTMF and MUTE input Adjustable sidetone suppression independent of sending and receiving amplification Integrated amplifier for loudhearing operation Anti-clipping for loudspeaker amplifier Improved acoustical feedback suppression Power down Voice switch Tone ringer interface with dc/dc converter D Zero crossing detection D Common speaker for loudhearing and tone ringer D Supply voltages for all functional blocks of a subscriber set D Integrated transistor for short circuiting the line voltage D Answering machine interface D Operation possible from 10 mA line currents Benefits D Savings of one piezo electric transducer D Complete system integration of analog signal processing on one chip D Very few external components Applications Feature phone, answering machine, fax machine, speaker phone Speech circuit Voice switch Audio amplifier Loudhearing and Tone ringing MC with EEPROM/ DTMF 94 8741 Tone ringer Rev. A1: 24.01.1995 Preliminary Information 1 2 U4092 Block diagram 94 8896 GT MICO TXIN IMPSEL 20 30 7 1 3 40 33 Power supply Imped control VL T S Current supply V M 9 GND 6 PD 31 I REF AGA control Supply 17 V RING R– attenuation 16 C OSC VMP 15 SW OUT + – 19 RF DO – + 24 34 RECO MUTX 37 36 GR RAC 35 STI 39 RECIN 18 THA 32 STO VL 8 AGA IND SENSE V B 11 10 V MP 14 V MPS 13 MIC1 TXA 5 MIC2 4 MIC 2 DTMF TTXA 38 TX ACL INLDR 27 INLDT 26 Figure 1 Transmit mute control TLDR 29 TLDT 28 Acoustical feedback suppression control 25 ATAFS Preliminary Information SAO 12 21 SACL TSACL SAI 23 22 TELEFUNKEN Semiconductors Rev. A1: 24.01.1995 GSA Tip hook switch C1 13 V R2 to m C 3 30 7 C8 VM 33 10 11 14 13 40 20 32 8 Ring R3 V M C2 C4 C5 C6 R4 C3 C7 Rev. A1: 24.01.1995 9 6 31 R6 17 16 15 Q1 C9 R5 28 V R1 R28 Micro– phone 1 5 TELEFUNKEN Semiconductors DTMF Generator R27 C22 C21 4 2 RECO C20 R20 38 27 MICO R19 C19 C18 26 U4092B 29 Loudspeaker C17 28 R31 25 19 C16 12 L1 R7 18 24 C 13 R13 R12 C 28 V M Earpeace C12 V M R9 R10 34 37 36 35 39 Figure 2 Application circuit for loudhearing C10 R8 C11 to pin 32 VL Preliminary Information V M C15 21 23 R17 C14 22 R16 R15 R14 Micro controller VMP U4092B 94 8849 3 4 hook switch C2 R1 13 V R3 R4 VM Tip C7 C3 R2 U4092 R25 DTMF 1 3 32 8 33 VM 4 2 38 27 17 26 16 15 Q1 C9 29 28 25 12 21 18 23 22 24 34 37 36 35 39 C10 C13 R 10 VM C12 VM VB VL R9 R8 C11 BC177 to pin 32 LOGTX R21 19 R7 L1 31 R6 R5 28 V 9 6 40 20 30 7 10 11 14 13 5 to m C C8 R24 C25 C1 C4 C6 C5 R26 C23 HF–Mic C24 Micro– phone Ring R23 R22 C21 RECO C27 R30 R29 LOGTX C26 C18 U4092B C17 R18 Loud speaker C16 C15 Figure 3 Application for handsfree operation R13 R12 C28 Earpiece R11 Preliminary Information VM R17 C14 R16 R15 R14 TELEFUNKEN Semiconductors Rev. A1: 24.01.1995 94 8850 Micro– controller VMP TELEFUNKEN Semiconductors U4092B R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 20 kW > 68 kW 10 W 1.5 kW 62 kW 680 kW 22 kW 330 W 3 kW 62 kW 30 kW 62 kW 120 kW 47 kW 1 kW 1.2 W 30 kW 6.8 kW 6.8 kW 15 kW 330 kW 220 kW 68 kW 2 kW 3.3 kW 18 kW 2 kW 1 kW 12 kW 56 kW Typical value of external components C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 L1 R1 100 nF 4.7 nF 10 mF 220 mF 47 mF 470 mF 820 nF 100 mF 100 nF 150 nF 68 nF 33 nF 10 mF 100 nF 1 mF 47 mF 10 mF 10 mF 68 nF 68 nF 1 mF 100 nF 6.8 nF 10 nF 100 nF 470 nF 33 nF 10 mF 2.2 mH 27 kW Rev. A1: 24.01.1995 Preliminary Information 5 U4092 GT DTMF MICO MIC2 MIC1 PD IND VL GND SENSE VB SAO 1 2 3 4 5 6 7 8 9 10 11 12 40 39 38 37 36 35 34 33 32 TXIN RECIN TTXA GR RAC STI RECO VM 7 STO IREF AGA TLDR TLDT INLDR INLDT ATAFS MUTX SAI GSA 15 IMPSEL 20 94 8900 TELEFUNKEN Semiconductors Pin description Pin 1 Symbol GT Function A resistor from this pin to GND sets the amplification of microphone and DTMF signals; the input amplifier can be muted by applying VMP to GT. Input for DTMF signals. Also used for the answering machine and handsfree input. Output of microphone preamplifier. Non-inverting input of microphone amplifier. Inverting input of microphone amplifier. Active high input for reducing the current consumption of the circuit. Simultaneously VL is shorted by an internal switch. 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. Line voltage Reference point for dc- and ac-output signals. A small resistor (fixed) connected from this pin to VL sets the slope of the dc characteristic and also effects the line length equalization characteristics and the line current at which the loudspeaker amplifier is switched on. Unregulated supply voltage for peripheral circuits (voice switch); limited to typically 7 V. Output of loudspeaker amplifier. Unregulated supply voltage for µP, limited to 6.3 V. Regulated supply voltage 3.3 V for peripheral circuits (especially microprocessors). The maximum output current is 2 mA. 2 DTMF 3 4 5 6 MICO MIC 2 MIC 1 PD IND U4092B 31 30 29 28 27 26 25 24 23 22 8 9 10 VL GND SENSE VMPS 13 VMP 14 SWOUT COSC VRING THA RFDO 15 16 17 18 19 11 VB 12 13 14 SAO VMPS VMP 21 TSACL 16 SWOUT Output for driving external switching transistor COSC 40 kHz oscillator for ringing power converter 6 Preliminary Information Rev. A1: 24.01.1995 TELEFUNKEN Semiconductors Pin 17 18 19 20 Symbol Function VRING Input for ringing signal THA Threshold adjustment for ringing frequency detector RFDO Output of ringing frequency detector IMP- Control input for selection of line SEL impedance 1. 600 Ω 2. 900 Ω 3. Mute of second transmit stage (TXA); also used for indication of external supply (answering machine); last chosen impedance is stored. TSACL Time constant of anticlipping of speaker amplifier GSA Current input for setting the gain of the speaker amplifier. Adjustment characteristic is logarithmical. For RGSA > 2 MΩ, the speaker amplifier is switched off. Speaker amplifier input (for loudspeaker, tone ringer and handsfree use) MUTX Three state input of transmit mute: 1) Speech condition; inputs MIC1 / MIC2 active 2) DTMF condition; input DTMF active. A part of the input signal is passed to the receiving amplifier as a confidence signal during dialing. 3) Input DTMF used for answering machine and handsfree use; receive branch not affected. ATAFS Attenuation of acoustical feedback suppression. Maximum attenuation of AFS circuit is set by a resistor at this pin. Without the resistor, AFS is switched off. INLDT Input of transmit level detector INLDR Input of receive level detector SA I Pin 29 29 30 U4092B Symbol Function TLDT Time constant of transmit level detector TLDR Time constant of receive level detector AGA Automatic gain adjustment with line current. A resistor connected from this pin to GND sets the starting point. Max. gain change is 6 dB. IREF Internal reference current generation; RREF = 62 kΩ; IREF = 20 µA Side tone reduction output. Output resistance is approximately 300 Ω. Maximum load impedance is 10 kΩ. Reference node for microphone-earphone and loudspeaker amplifier. Supply for electret microphone (IM ≤ 300 mA). Output of receiving amplifier Input for side tone network Input of receiving amplifier for ac coupling in feedback path A resistor connected from this pin to GND sets the receiving amplification of the circuit; amplifier RA1 can be muted by applying VMP to GR 31 32 STO 21 22 33 VM 34 35 36 37 RECO STI RAC GR 23 24 38 39 40 25 Time constant of anticlipping in transmit path RECIN Input of receiving path; input impedance is typically 80 kW TXIN Input of intermediate transmit stage, input resistance is typically 20 kΩ TTXA 26 27 Rev. A1: 24.01.1995 Preliminary Information 7 U4092 DC line interface and supply voltage generation The DC line interface consists of an electronic inductance and a dual port output stage, which charges the capacitors at VMPS and VB. The value of the equivalent inductance is given by L = RSENSE @ CIND @ (RDC @ R30) / (RDC + R30) In order to improve the supply during worst case operating VL 10 W SENSE R SENSE C IND 10 mF IND RDC + – – + TELEFUNKEN Semiconductors conditions two PNP current sources – IBOPT and IMPSOPT – hand an extra amount of current to the supply voltages, when the NPNs in parallel are unable to conduct current. A flowchart for the control of the current sources (figure 5) shows, how a priority for supply VMPS is achieved. IBOPT < 5 mA IMPSOPT < 5 mA 6.3 V VMPS 470 mF VMP 3.3 V/ 2 mA VB 47 mF 220 mF = 3.3 V 30 k W R30 = VOFFS + – 7.0 V 94 8047 Figure 4 DC line interface with electronic inductance and generation of a regulated and an unregulated supply Y VSENSE–VMPS>200 mV VMPS < 6.3 V N N Y VSENSE–VB>200 mV N IMPSOPT = 0 IBOPT = 0 Y VB < 6.3 V N Y Charge CMPS (IMPSOPT) 94 8058 Charge CB (IBOPT) Reduce IBOPT (IMPSOPT = 0) Figure 5 Supply capacitors CMPS and CB are charged with priority on CMPS 8 Preliminary Information Rev. A1: 24.01.1995 TELEFUNKEN Semiconductors The U4092B contains two identical series regulators, which provide a supply voltage VMP of 3.3 V at 2 mA suitable for a microprocessor. In speech mode both regulators are active, because VMPS and VB are charged simultaneously by the DC-line interface. The capacitor at VMPS is used to provide the microcomputer with sufficient U4092B power during long line interruptions. Thus long flash pulses can be bridged or a LCD display can be turned on for more than 2 seconds after going on hook. When the system is in ringing mode, VB is charged by the on chip ringing power converter. In this mode only one regulator is used to supply VMPS. V RING RPC Voltage regulator V B 7V VMP VMPS Voltage regulator VL Power supply 6.3 V QS PD ES IMPED CONTR LIDET IMPSEL VLon RFDO RFD TXA TXACL OFFSA COMP SAI,SA SACL AFS MIC, DTMF AGA, RA1, RA2 TX MUTE MUT REC, STBAL RECATT 95 9628 Figure 6 Supply of functional blocks is controlled by input voltages VL, VB, Vring and by logic inputs PD and IMPSEL There are four major supply states: 1. 2. 3. 4. Speech condition Power down (pulse dialing) Ringing External supply For line voltages below 1.9 V the switches remain in their quiescent state as shown the diagram. OFFSACOMP disables the group listening feature (SAI, SA, SACL, AFS) below line currents of approximately 10 mA. 2. When the chip is put into Power-down mode (PD = high), e.g. during pulse dialing, the internal switch QS shorts the line and all amplifiers are switched off. In this condition LIDET, voltage regulators and IMPED CONTR are the only active blocks. 1. In speech condition the system is supplied by the line current. If the LIDET-block detects a line voltage above the fixed threshold (1.9 V), the internal signal VLON is activated, thus switching off RFD and RPC and switching on all other blocks of the chip. Rev. A1: 24.01.1995 Preliminary Information 9 U4092 3. During ringing the supply for the system is fed into VB via the ringing power converter (RPC). The only functional amplifiers are found in the speaker amplifier section (SAI, SA, SACL). 4. In an answering machine the chip is powered by an external supply via pin VB. This application demands a posibility to activate all amplifiers (except the transmit line interface TXA). Selecting IMPSEL = high impedance activates all switches at the ES line. TELEFUNKEN Semiconductors Acoustic feedback suppression Acoustical feedback from the loudspeaker to the handset microphone may cause instability in the system. The U4092B offers a very efficient feedback suppression circuit, which uses a modified voice switch topology. figure 8 shows the basic system configuration. TX Att Handset microphone Log Hybrid Att contr Line Log Loudspeaker RX Att 94 8956 Figure 8 Basic voice switch system Two attenuators (TX ATT and RX ATT) reduce the critical loop gain by introducing an externally adjustable amount of loss either in the transmit or in the receive path.The sliding control in block ATT CONTR determines, wether the TX or the RX signal has to be attenuated. The overall loop gain remains constant under all operating conditions. Selection of the active channel is made by comparison of the logarithmically compressed TX- and RX- envelope curve. The system configuration for group listening, which is realized in the U4092B, is illustrated in figure 9. TXA and SAI represent the two attenuators, whereas the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes). 10 Preliminary Information Rev. A1: 24.01.1995 TELEFUNKEN Semiconductors U4092B VL INLDT TLDT STO VL ZL GT MICO TIN VBG – + TXA Zint SAO AFS control Max att. AGA GSA SAI SAI TLDR – VBG + INLDR RECO GR RECIN STI STO STN 95 9629 Figure 9 Integration of acoustic feedback suppression circuit into the speech circuit environment A detailed diagram of the AFS (acountic feedback suppression) is given in figure 10. Receive and Transmit signals are first processed by logorithmic rectifiers in order to produce the envelopes of the speech at TLDT and RLDT. After amplification a decision is made by the differential pair, which direction should be transmitted. Rev. A1: 24.01.1995 Preliminary Information 11 U4092 TLDT TXA SAI TELEFUNKEN Semiconductors TX RLDT INLDT AGA IAGAFS IAT IATAFS IATGSA 94 8060 AGA RX RLDR INLDR IGSA TLDR RATAFS ATAFS GSA Figure 10 Accoustic feedback suppression by alternative control of transmit- and speaker amplifier gain The attenuation of the controlled amplifiers TXA and SAI is determined by the emitter current IAT, which is comprised of three parts: IATAFS sets maximum attenuation IATGSA decreases the attenuation, when speaker amplifier gain is reduced IAGAFS decreases the attenuation according to the loop gain reduction caused by the AGA-function IAT = IATAFS – IATGSA – IAGAFS DG = IAT * 0.67 dB/mA Figure 11 illustrates the principal relationship between speaker amplifier gain (GSA) and attenuation of AFS (ATAFS). Both parameters can be adjusted independently, but the internal coupling between them has to be considered. Maximum usable value of GSA is 36 dB. The shape of the characteristic is moved in the x-direction by adjusting resistor RATAFS, thus changing ATAFSm. The actual value of attenuation (ATAFSa), however, can be determined by reading the value which belongs to the actual gain GSAa. If the speaker amplifier gain is reduced, the attenuation of AFS is automatically reduced by the same amount, in order to achieve a constant loop gain. Zero attenuation is set for speaker gains GSA GSA0 = 36 dB – ATAFSm. v 12 Preliminary Information Rev. A1: 24.01.1995 TELEFUNKEN Semiconductors U4092B 94 8957 ATAFS (dB) ATAFSm RATAFS RATAFS ATAFSa not usable GSAo GSAa 36 dB GSA (dB) Figure 11 Reducing speaker amplifier gain results in an equal reduction of AFS attenuation Ringing power converter (RPC) RPC transforms the input power at VRING (high voltage/ low current) into an equivalent output power at VB (low voltage/ high current), which is capable of driving the low ohmic loudspeaker. Input impedance at VRING is fixed at 5 kW and the efficiency of the step down converter is approx. 65%. Ringing frequency detector (RFD) The U4092B offers an output signal for the microcontroller, which is a digital representation of the double ringing frequency. It is generated by a current comparator with hysteresis. Input voltage VRING is transformed into a current via RTHA. Thresholds are 8 mA and 24 mA. RFDO and VRING are in phase. A second comparator with hysteresis is used to enable the output RFDO, as long as the supply voltage for the microprocessor VMP is above 2.4 V (2.9 V). Rev. A1: 24.01.1995 Preliminary Information 13 U4092 Absolute maximum ratings Parameters Line current DC line voltage Maximum input current Pin 17 Junction temperature Ambient temperature Storage temperature Total power dissipation, Tamb = 60°C Symbol IL VL IRING Tj Tamb Tstg Ptot TELEFUNKEN Semiconductors Value 140 12 15 125 – 25 to + 75 – 55 to + 150 1 Unit mA V mA °C °C °C W Thermal resistance Junction ambient Parameters SDIP 40 Symbol RthJA Value 50 Unit K/W Electrical characteristics f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kW, Tamb = 25°C, RGSA = 560 kW, Zear = 68 nF + 100 W, ZM = 68 nF, pin 31 open, VIMPSEL = GND, VMUTX = GND, unless otherwise specified. Parameters DC characteristics DC voltage drop over circuit Test conditions / Pin IL = 2 mA IL = 14 mA IL = 60 mA IL = 100 mA Symbol VL 4.6 8.8 Min. Typ. 2.4 5.0 7.5 9.4 Max. Unit Figure 5.4 10.0 V 22 Transmission amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 kW, unless otherwise specified Adjustment range of transmit GT 40 45 50 gain Transmitting amplification RGT = 12 kW 47 48 49 RGT = 27 kW 39.8 41.8 GT Frequency response IL 14 mA, DGT 0.5 f = 300 to 3400 Hz Gain change with current Pin 31 open DGT 0.5 IL = 14 to 100 mA Gain deviation Tamb = – 10 to + 60°C DGT 0.5 CMRR of microphone CMRR 60 80 amplifier Input resistance of MIC RGT = 12 kW Ri 50 amplifier RGT = 27 kW 75 45 110 Distortion at line IL > 14 mA dt 2 VL = 700 mVrms Maximum output voltage IL > 19 mA VLmax 1.8 3 4.2 d < 5% Vmic = 25 mV CTXA = 1 mF dB dB dB dB dB dB kW % dBm 24 24 24 24 24 24 24 24 24 w " " " Noise at line psophometrically weighted Anti-clipping attack time release time 14 IL > 14 mA GT = 48 dB CTXA = 1 mF each 3 dB overdrive no – 80 0.5 9 –72 dBmp ms 24 24 Preliminary Information Rev. A1: 24.01.1995 TELEFUNKEN Semiconductors Parameters Gain at low operating current Test conditions / Pin IL = 10 mA IMP = 1 mA RDC = 68 kW Vmic = 1 mV IM = 300 mA IL = 10 mA IM = 300 mA IMP = 1 mA RDC = 68 kW Vmic = 10 mV IL = 100 mA, RAGA = 20 kW IL 14 mA Mutx = open Symbol GT Min. 40 Typ. Max. 42.5 U4092B Unit dB Figure 24 Distortion at low operating current dt 5 % 24 Line loss compensation D GTI – 6.4 – 5.8 – 5.2 dB dB 24 24 Mute suppression GTM 60 80 a) MIC muted (microphone preamplifier p p IMPSEL = open GTTX 60 b) TXA muted (second stage) Receiving amplifier, IL = 14 mA, RGR = 62 k, unless otherwise specified, VGEN = 300 mV Adjustment range of receivIL 14 mA, single GR –8 +2 ing gain ended Receiving amplification RGR = 62 kW GR – 7.75 –7 – 6.25 RGR = 22 kW 1.5 Amplification of DTMF sig- IL 14 mA GRM 1 4 7 nal from DTMF IN to RECO VMUTX = VMP Frequency response IL > 14 mA, DGRF 0.5 f = 300 to 3400 Hz Gain change with current IL = 14 to 100 mA DGR 0.5 Gain deviation Tamb = – 10 to + 60°C DGR 0.5 Ear protection IL 14 mA EP 1.1 VGEN = 11 Vrms MUTE suppression IL 14 mA DGR 60 DTMF operation VMUTX = VMP Output voltage d 2% IL = 14 mA Zear = 68 nF 0.5 Maximum output current Zear = 100 W 4 d 2% Receiving noise Zear = 68 nF + 100 W ni – 80 – 77 psophometrically weigthed IL 14 mA Output resistance Output against GND Ro 10 Line loss compensation RAGA = 20 kW, DGRI – 7.0 – 6.0 – 5.0 IL = 100 mA w dB 24 w w dB dB dB dB dB dB Vrms dB 23 23 23 23 23 23 23 23 23 v w w " " " v w Vrms mA (peak) dBmp W 23 23 23 23 dB Rev. A1: 24.01.1995 Preliminary Information 15 U4092 Parameters Gain at low operating current Test conditions / Pin IL = 10 mA IMP = 1 mA IM = 300 mA VGEN = 560 mV RDC = 68 kW VIMPSEL = GND VIMPSEL = VMP IL = 10 mA IMP = 1 mA VGEN = 560 mV RDC = 68 kW No ac signal Pin 24 VSAI = 3 mV, IL = 15 mA, RGSA = 560 kW RGSA = 20 kW Load resistance RL = 50 W, d < 5% VSAI = 20 mV IL = 15 mA IL = 20 mA IL > 15 mA Symbol Min. GR –8 TELEFUNKEN Semiconductors Typ. Max. Unit Figure 23 –7 –6 dB AC impedance Distortion at low operating current Zimp Zimp dR 570 840 600 900 640 960 5 W W % 23 23 Speaker amplifier Minimum line current for operation Input resistance Gain from SAI to SAO ILmin 14 GSA 15 22 mA kW dB 27 27 27 35.5 36.5 –3 37.5 27 Output power Output noise (Input SAI open) psophometrically weighted Gain deviation Mute suppression PSA PSA nSA 3 7 20 200 mW mVpsoph dB dBm 27 IL = 15 mA Tamb = – 10 to + 60°C IL = 15 mA, VL = 0 dBm, VSAI = 4 mV Pin 23 open IL = 15 to 100 mA IL = 15 to 100 mA IL = 15 mA f = 300 to 3400 Hz 20 dB over drive DGSA VSAO "1 – 60 27 27 Gain change with current Resistor for turning off speaker amplifier Gain change with frequency DGSA RGSA 0.8 1.3 "1 2 dB MW dB ms ms dB dB 27 27 27 27 27 25 25 DGSA " 0.5 Attack time of anti-clipping tr 5 Release time of anti-clipping tf 80 DTMF-amplifier Test conditions: IMP = 2 mA, IM = 0.3 mA, VMUTX = VMP Adjustment range of DTMF IL = 15 mA GD 40 50 gain Mute active DTMF amplification IL = 15 mA, GD 40.7 41.7 42.7 VDTMF = 8 mV Mute active: MUTX = VMP Gain deviaton IL = 15 mA Tamb = – 10 to + 60°C GD " 0.5 dB 25 16 Preliminary Information Rev. A1: 24.01.1995 TELEFUNKEN Semiconductors Parameters Input resistance Test conditions / Pin Symbol RGT = 27 kW, Ri RGT = 15 kW Distortion of DTMF signal IL 15 mA dD VL = 0 dBm Gain deviation with current IL = 15 to 100 mA DGD AFS acousting feedback suppression Adjustment range of IL 15 mA attenuation Attenuation of transmit gain IL 15 mA, DGT IINLDT = 0 mA RATAFS = 30 kW IINLDR = 10 mA Attenuation of speaker IL 15 mA DGSA amplifier IINLDP = 0 m RATAFS = 30 kW IINLDR = 10 m AFS disable IL 15 mA VATAFS Supply voltages, Vmic = 25 mV, Tamb = – 10 to + 60°C VMP IL = 14 mA, VMP RDC = 68 kW IMP = 2 mA VMPS IL = 100 mA VMPS RDC = inf., IMP = 0 mA VM IL 14 mA, VM IM = 300 mA RDC = 130 kW VB IB = + 20 mA, VB IL = 0 mA Ringing power converter, IMP = 1 mA, IM = 0 Maximum output power VRING = 20.6 V PSA Threshold of ring frequency RFDO: low to high VRINGON detector VHYST = VRINGON – VRING VHYST OFF Input impedance VRING = 30 V RRING Input impedance in speech f = 300 Hz to 3400 Hz RRINGSP mode IL > 15 mA, Min. 60 26 Typ. 180 70 Max. 300 130 2 U4092B Unit kW % dB dB dB Figure 25 25 25 27 27 w w w w w " 0.5 0 45 50 50 dB 27 1.5 3.1 3.3 3.5 V V 27 22 6.7 V 22 w 1.4 3.3 V 22 7 7.6 V 22 20 17.5 11.0 4 150 5 6 mW V kW kW V 26 26 26 26 VRING = 20V + 1.5Vrms Logic-level of frequency detector Ring detector enable Ring detector disable VRING = 0 V, VB = 4 V VRING = 25 V VRING = 25 V, RFDO high VRING = 25 V, RFDO low VRFDO 0 VMP 2.9 2.35 26 VMPON VMPOFF 2.7 2.2 3.1 2.5 V V 26 26 Rev. A1: 24.01.1995 Preliminary Information 17 U4092 Parameters PD input PD input current Test conditions / Pin Symbol Ipd Vpd Vpd VL VL 2 Min. PD active, IL > 14 mA VPD = VMP Input voltage PD = active PD = inactive Voltage drop at VL IL = 14 mA, PD = active IL = 100 mA, PD = active Input characteristics of IMPSEL Input current IL 14 mA VIMPSEL = VMP VIMPSEL = GND Input voltage p g Input high Input low MUTX input Input current VMUTX = VMP VMUTX = GND Input voltage p g Input high Input low TELEFUNKEN Semiconductors Typ. 9 Max. Unit uA V 0.3 1.5 1.9 V 28 Figure 28 28 w IIMPSEL IIMPSEL VIMPSEL VIMPSEL IMUTX IMUTX VMUTX VMUTX 18 – 18 VMP-0.3V mA mA 0.3 V V 28 28 28 28 28 28 20 – 20 VMP-0.3V 30 – 30 0.3 mA mA V V U4092B – control 0 IMPSEL Line-impedance = 600 W TXA = on ES = off Line-impedance = 600 W TXA = off ES = on Line-impedance = 900 W TXA = off ES = on Line-impedance = 900 W TXA = on ES = off MODE Speech 0 MUTX MIC 1/2 transmit enabled receive enable AFS = on AGA = on TXACL = on DTMF transmit enabled receive enable AFS = on AGA = on TXACL = on DTMF transmit enabled DTMF to receive enable AFS = off AGA = off TXACL = off MODE Speech 0 to Z Transmit-mute Z Transmit-mute 1 to Z For answering machine 1 Speech 1 DTMF dialling Logic-level 0 = < (0.3 V) Z = > (1 V) < (VMP – 1 V) or (open input) 1 = > (VMP – 0.3 V) RECATT = STI = ES = AFS = AGA = TXACL = Receive attenuation Input of sidetone balancing amplifier External supply Acoustical feedback supression control Automatic gain adjustment Transmit anticlipping control 18 Preliminary Information Rev. A1: 24.01.1995 TELEFUNKEN Semiconductors U4092B 94 8856 Figure 14 Typical DC characteristic GT (dB) RGT (kohm) 94 8860 Figure 15 Typical adjustment range of transmit gain Rev. A1: 24.01.1995 Preliminary Information 19 U4092 TELEFUNKEN Semiconductors 94 9680 Figure 16 Typical adjustment range of receive gain 948855 Figure 17 Typical AGA-characteristic 20 Preliminary Information Rev. A1: 24.01.1995 TELEFUNKEN Semiconductors U4092B 94 8858 Figure 18 Typical load characteristic of VB for a maximum (RDC = infinity) DC-characteristic and 3 mW loudspeaker output 94 8874 Figure 19 Typical load characteristic of VB for a medium DC-characteristic (RDC = 130 kW) and 3 mW loudspeaker output Rev. A1: 24.01.1995 Preliminary Information 21 U4092 TELEFUNKEN Semiconductors 94 8861 Figure 20 Typical load characteristic of VB for a minimum DC-characteristic (RDC = 68 kW) and 3 mW loudspeaker output 22 Preliminary Information Rev. A1: 24.01.1995 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 68 nF Figure 21 Basic test circuit 17 18 19 20 RGT 68 nF 600 W RDC S1 22 mF IL 4.7 nF 10 m F 10 1 kW W 47 mF 1000 m F 47 mF IMP 50 680 k W Preliminary Information 100 m F 10 m F 3.3 nF 27 26 25 3.3 nF 29 28 10 m F 37 36 35 34 33 32 31 30 VM W BC556 IDC S2 open VRing 220 mF 2.2 mH SD103A DC VMP reference figure for not connected pins S1 = closed: speech mode U4092B S2 = closed: ringer mode 95 9650 Rev. A1: 24.01.1995 VM VM 36 kW 3 kW 47 nF open VMP 10 m F IM 62 k W 2 MW RGSA 1 mF 24 23 22 21 Mico VL RGR TELEFUNKEN Semiconductors 220 nF 150 nF 1m F 40 39 38 U4092B 23 1 68 nF 10 m F 4.7 nF b IB RDC V DC IL VL a S1 open VB VMP 10 W 220 m F 1000 m F 47 m F 2 3 4 5 6 7 8 9 10 11 12 13 14 15 IMP 16 17 18 19 20 RGT Figure 22 DC characteristics, line detection Preliminary Information 37 36 35 34 33 32 31 30 29 28 27 26 25 24 VMIC Line detection: S1a VB (external supply): S1b TELEFUNKEN Semiconductors Rev. A1: 24.01.1995 open pins should be connected as shown in figure 21 95 9649 24 U4092 Mico 100 m F RAGA 30 k W RGSA ZEAR IM 62 k W VL VM 10 m F RGR 220 nF 150 nF 1 m F 1m F 40 39 38 23 22 21 U4092B open VM VMP 100 mF Mico 10 m F RAGA S3 29 28 27 26 25 24 23 22 1mF VZEAR 1 68 nF 10 m F VDTMF 4.7 nF 2 10 W IL V 22 m F S1 b VGEN AC a VLR 220 m F 1000 m F 47 m F 3 4 5 6 7 8 9 10 11 12 13 14 15 IMP 16 17 18 19 20 RGT Figure 23 Receiving amplifier 220 nF V RDC 1 kW 600 W V MP open S2 Preliminary Information U4092B Mute suppression: VM Line loss compensation: DGRI = GR (at IL = 100 mA) –GR (at IL = 14 mA), S3 = closed Receiving noise: S1a Receive amplification: GR = 20*log ( VZEAR/VLR) dB (S1 = b, S2 open) DTMF-control signal: GRM = 20*log (VZEAR/VDTMF) dB (S1 =a, S2 = closed) AC-impedance: (VLR/ (VGEN – VLR)) * ZL DTMF operation:D GR = 20*log (VLR/VZEAR) dB + GR, MUTX = VMP open pins should be connected as shown in figure 21 95 9648 Rev. A1: 24.01.1995 RGR ZEAR VL 220 nF 150 nF 1 mF IM 62 k W TELEFUNKEN Semiconductors 40 39 38 37 36 35 34 33 32 31 30 21 U4092B 25 1 68 nF S1 b S2 25 k W RDC IL 4.7 nF a 10 mF 10 W 220 m F 1000 mF 47 m F IMP 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 RGT VMP open 25 k W Figure 24 Transmission amplifier Transmitting amplification GT = 20*log 600 W V 22 mF VL, dt, no VL Vmic Vmic VCM Line loss compensation: Preliminary Information Gain change with current: Input resistance: Ri = 50 k VL (S2 = closed) VL (S2 = open) AC S1 DGTI = GT (at IL = 100 mA) –GT (at IL = 14 mA), S3 = closed DGTI = GT (at IL = 100 mA) –GT (at IL = 14 mA) –1 b a 1 mF Common mode rejection ratio: CMRR = 20*log Mute suppression: GTM = 20*log GTTX = 20*log VCM + GT with S1b, S2 = closed, S3 = open VL (at MUTX = low) VL VL (at MUTX = open) VL (at IMPSEL = low) VL (at IMPSEL = open) open pins should be connected as shown in figure 21 95 9647 26 open VM VMP 100 mF RAGA RGR ZEAR S3 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 IM 1 mF 62 k W 10 mF U4092 Mico VL 220 nF 150 nF 1 mF 40 39 38 37 U4092B TELEFUNKEN Semiconductors Rev. A1: 24.01.1995 1 68 nF 10 mF VDTMF V RDC 4.7 nF IL V 1kW VM 10 W 220 mF 1000 mF 2 3 4 5 6 7 8 9 10 11 12 13 47 mF 14 15 IMP 16 17 18 19 20 Figure 25 DTMF amplifier RGT 220 nF Preliminary Information 37 36 35 34 33 32 31 30 29 28 27 26 25 VL: S3 = closed S3 50 k W VL 50kW: S3 = open dD DTMF-amplifier: 20log (VL/VDTMF) dB Input resistance: (VL50K / (VL – VL50k)) * 50k W Open pins should be connected as shown in figure 21 VGEN3 U4092B AC 95 9643 Rev. A1: 24.01.1995 VM 10 m F RGR ZEAR IM 62 k W 100 mF VMP 1 mF open 24 23 22 21 Mico VL TELEFUNKEN Semiconductors 220 nF 150 nF 1 m F 40 39 38 U4092B 27 1 47 mF 10 W VSAO RDC IMP ramp IL VMP 4.7 nF 50 W 47mF 1000 mF 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 680 kW 68 nF 18 19 V 20 VRFDO Figure 26 Ringing power converter 35 34 33 32 31 30 29 28 27 26 25 24 23 68 nF S5 10 mF VRING V BC556 IRING VRING 1.5 V 20 V 95 9644 28 Vsao2 1) Max. output power: PSA = (S4 closed) RSAO 2) Threshold of ringing frequency detector: U4092 detecting VRFDO, when driving VRING from 2 V to 22 V (VRINGON) and back again (VRINGOFF) (S2 = closed) VRING 3) Input impedance: RRING = (S3 = closed) IRING Vring 4) Input impedance in speech mode (IL > 15 mA):RRINGSP = (S1 = closed) Iring 5) Ring detector enable: detecting VRFDO, when driving VMP from 0.7 V to 3.3 V VSAI 1.8 Vpp 1 kHz (VMPON) and back again (VMPOFF) (S5, S3 = closed) Open pins should be connected as shown in figure 21 100 m F 22 62 k W 1 mF 21 100 nF RGSA 40 39 38 37 36 U4092B Preliminary Information 220 mF 2.2 mH SD103A S1 S2 S3 IRING ramp S4 20.6 V DC DC DC TELEFUNKEN Semiconductors Rev. A1: 24.01.1995 30 k W VM IINLDR IINLDT VATAFS 1 68 nF S1 RDC VMIC 4.7 nF 600 W 22 m F 50 W 10 W 47 m F 220 m F 1000mF 2 10 mF 3 4 5 6 7 8 9 10 11 12 13 14 47 m F 15 IMP 16 17 18 19 20 Figure 27 Speaker amplifier RGT Preliminary Information U4092B VL V IL V 2 VSAO, S4 = closed VZIN, S4 = open n SA Input impedance: (VZIN/(VSAO – VZIN)) * RIN Gain from SAI to SAO: 20*log (VSAO / VSAI) dB VSAO RSAO Output power: PSA = U4092B Attenuation of transmit gain: S1 = closed Open pins should be connected as shown in figure 21 95 9646 Rev. A1: 24.01.1995 220 nF V VSAI RGR 1mF ZEAR off S4 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 10 mF 10 mF 62 k W 20 kW 10 mF RGSA 1mF 21 Mico 220 nF 150 nF TELEFUNKEN Semiconductors 40 39 29 1 68 nF Ipd 10 220 F 1000 F 2 10 m F 3 4 5 6 7 8 9 10 11 12 13 47 F 14 15 IMP 16 17 18 19 20 IIMPSEL RGT W m m Figure 28 Input characteristic m open Vpd RDC Preliminary Information 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 4.7 nF VMP V IL VL VMP TELEFUNKEN Semiconductors Rev. A1: 24.01.1995 Open pins should be connected as shown in figure 21 95 9645 30 U4092 VMP VM 10 m F RGR ZEAR IM IMUTX 23 22 21 62 kW 100 m F RGSA 1F m 40 39 U4092B TELEFUNKEN Semiconductors U4092B Package SDIP 40 Ordering information Type U4092B-SD Dimensions in mm Package: SDIP 40 94 8915 We reserve the right to make changes without further notice to improve technical design. Parameters can vary in different applications. All operating parameters must be validated for each customer application by customer. Should Buyer use TEMIC products for any unintended or unauthorized application, 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 2412 Rev. A1: 24.01.1995 Preliminary Information 31 U4092 It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to TELEFUNKEN Semiconductors OZONE DEPLETING SUBSTANCES POLICY STATEMENT 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 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 Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. (2) (3) TEMIC can certify that our semiconductors are not manufactured with and do not contain ozone depleting substances. 32 Preliminary Information Rev. A1: 24.01.1995