U4092B TELEFUNKEN Semiconductors 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 DC characteristic adjustable D D D D D D Integrated amplifier for loudhearing operation Transmit and receive gain adjustable Symmetrical input of microphone amplifier D Zero crossing detection D Common speaker for loudhearing and tone ringer D Supply voltages for all functional blocks of a subscriber set Anti-clipping in transmit direction D Integrated transistor for short circuiting the line voltage D Answering machine interface D Operation possible from 10 mA line currents Automatic line loss compensation Built-in ear protection DTMF and MUTE input Adjustable sidetone suppression independent of sending and receiving amplification Anti-clipping for loudspeaker amplifier Benefits Improved acoustical feedback suppression D Savings of one piezo electric transducer D Complete system integration of analog signal Power down processing on one chip Voice switch Tone ringer interface with dc/dc converter Applications Feature phone, answering machine, fax machine, speaker phone D Very few external components Speech circuit Audio amplifier Voice switch Tone ringer Loudhearing and Tone ringing MC with EEPROM/ DTMF 94 8741 Rev. A1: 24.01.1995 Preliminary Information 1 2 Preliminary Information SAI TSACL SAO ATAFS TLDT TLDR INLDT INLDR TTXA DTMF MIC2 MIC1 23 21 12 25 28 29 26 27 38 2 4 5 MIC TX ACL 3 RECO MUTX GSA 32 34 TXA 40 STO 24 Transmit mute control 1 GT MICO TXIN 22 SACL Acoustical feedback suppression control 94 8896 37 VL 8 GR RAC 36 Imped control 20 IMPSEL STI 35 7 30 AGA control IND AGA VMP Current supply Supply RECIN 39 V MP 14 Power supply R– attenuation T S VL SENSE V B 11 10 – + – + V MPS 13 V RING I REF PD GND V M 18 19 THA RF DO 15 SW OUT 16 C OSC 17 31 6 9 33 U4092 TELEFUNKEN Semiconductors Block diagram Figure 1 Rev. A1: 24.01.1995 Rev. A1: 24.01.1995 R27 VM C19 Preliminary Information R16 R17 Loudspeaker MICO R19 RECO C20 R20 C22 DTMF Generator R28 R1 94 8849 29 26 27 38 4 2 5 R14 C14 C15 C16 23 21 12 3 R13 22 1 C17 28 R31 25 C18 C21 Micro– phone R15 VM R12 40 C1 24 30 C 28 7 37 C3 U4092B 20 13 V R2 Earpeace 34 32 8 C2 VM C12 VM R4 10 R9 R10 C 13 36 R3 C11 R8 11 C5 to pin 32 35 C4 14 39 VL R6 R7 VM C8 to m C C10 18 19 15 16 17 9 6 31 33 13 C6 L1 Q1 C9 R5 Micro controller 28 V hook switch Ring VMP C7 Tip TELEFUNKEN Semiconductors U4092B Figure 2 Application circuit for loudhearing 3 4 R24 HF–Mic Preliminary Information 94 8850 VM R16 R29 C27 R30 C24 C25 C26 R17 Loud speaker LOGTX RECO R22 R23 C23 DTMF R25 R15 R14 C14 C15 C16 R18 C17 C18 C21 Micro– phone R26 VM 24 32 8 20 30 7 36 R3 10 R4 35 11 14 C5 13 C6 23 21 12 25 28 29 26 27 38 2 R13 22 R12 C28 Earpiece 34 R11 U4092B 37 VM C12 VM R9 C13 R 10 to pin 32 C11 R8 C10 LOGTX VL 39 18 19 15 16 17 31 9 6 40 R2 C4 4 3 13 V C3 33 1 C2 5 R1 C1 R7 BC177 R21 VB R6 VM to m C C8 L1 Q1 C9 R5 Micro– controller 28 V hook switch Ring VMP C7 Tip U4092 TELEFUNKEN Semiconductors Figure 3 Application for handsfree operation Rev. A1: 24.01.1995 U4092B TELEFUNKEN Semiconductors 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 Rev. A1: 24.01.1995 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 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 Preliminary Information 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 5 U4092 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. 2 DTMF RAC 3 4 MICO MIC 2 35 STI 5 MIC 1 7 34 RECO 6 PD VL 8 33 VM 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. 7 IND GND 9 32 STO SENSE 10 31 IREF 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. VB 11 30 AGA 8 9 VL GND SAO 12 29 TLDR 10 SENSE VMPS 13 28 TLDT VMP 14 27 INLDR 11 VB 12 13 SAO VMPS 14 VMP 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. GT 1 40 TXIN DTMF 2 39 RECIN MICO 3 38 TTXA MIC2 4 37 GR MIC1 5 36 PD 6 IND U4092B SWOUT 15 26 INLDT COSC 16 25 ATAFS VRING 17 24 MUTX THA 18 23 SAI RFDO 19 22 GSA IMPSEL 20 21 TSACL 15 94 8900 6 16 SWOUT Output for driving external switching transistor COSC 40 kHz oscillator for ringing power converter Preliminary Information Rev. A1: 24.01.1995 U4092B TELEFUNKEN Semiconductors Pin 17 18 19 20 21 22 23 24 25 26 27 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. SA I 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. Pin 29 29 30 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. 31 IREF 32 STO 33 VM 34 RECO 35 36 STI RAC 37 GR 38 TTXA 39 40 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 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 INLDT Input of transmit level detector INLDR Input of receive level detector Rev. A1: 24.01.1995 Preliminary Information 7 U4092 TELEFUNKEN Semiconductors 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 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. 10 W SENSE R SENSE IBOPT IMPSOPT < 5 mA < 5 mA C IND VMPS 6.3 V 10 mF – + + – IND 30 k W R30 RDC = 470 mF = VMP 3.3 V + – VOFFS 7.0 V 3.3 V/ 2 mA 47 mF VB 220 mF 94 8047 Figure 4 DC line interface with electronic inductance and generation of a regulated and an unregulated supply Y VMPS < 6.3 V N VSENSE–VMPS>200 mV N Y N VSENSE–VB>200 mV IMPSOPT = 0 IBOPT = 0 Y VB < 6.3 V N Y Charge CMPS (IMPSOPT) Charge CB (IBOPT) Reduce IBOPT (IMPSOPT = 0) 94 8058 Figure 5 Supply capacitors CMPS and CB are charged with priority on CMPS 8 Preliminary Information Rev. A1: 24.01.1995 U4092B 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 VRING 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. RPC VB Voltage regulator 6.3 V VMP VMPS Power supply VL Voltage regulator 7V QS PD ES IMPED CONTR IMPSEL LIDET 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. For line voltages below 1.9 V the switches remain in their quiescent state as shown the diagram. Speech condition Power down (pulse dialing) Ringing External supply OFFSACOMP disables the group listening feature (SAI, SA, SACL, AFS) below line currents of approximately 10 mA. 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 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. Preliminary Information 9 U4092 TELEFUNKEN Semiconductors 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. 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 Line Att contr 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 10 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). Preliminary Information Rev. A1: 24.01.1995 U4092B TELEFUNKEN Semiconductors VL GT MICO TIN INLDT VBG TLDT – + STO VL ZL TXA Zint SAO AFS control Max att. AGA GSA – VBG + SAI SAI TLDR INLDR RECIN RECO GR 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 Rev. A1: 24.01.1995 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. Preliminary Information 11 U4092 TELEFUNKEN Semiconductors TLDT TXA TX SAI RLDT INLDT AGA AGA RX IAGAFS RLDR IAT IATAFS INLDR IGSA IATGSA 94 8060 TLDR ATAFS GSA RATAFS 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 12 (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. Preliminary Information v Rev. A1: 24.01.1995 U4092B TELEFUNKEN Semiconductors 94 8957 ATAFS (dB) ATAFSm RATAFS RATAFS not usable ATAFSa GSAo GSAa 36 dB GSA (dB) Figure 11 Reducing speaker amplifier gain results in an equal reduction of AFS attenuation Ringing power converter (RPC) Ringing frequency detector (RFD) 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%. 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 TELEFUNKEN Semiconductors 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 Value 140 12 15 125 – 25 to + 75 – 55 to + 150 1 Unit mA V mA °C °C °C W Symbol RthJA Value 50 Unit K/W Thermal resistance Junction ambient Parameters SDIP 40 Electrical characteristics f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k, Tamb = 25°C, RGSA = 560 k, Zear = 68 nF + 100 , 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 Min. VL 4.6 8.8 Typ. 2.4 5.0 7.5 9.4 Max. Unit Figure 5.4 V 22 dB 24 dB 24 dB 24 dB 24 dB dB 24 24 k 24 % 24 dBm 24 10.0 Transmission amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 k, unless otherwise specified Adjustment range of transmit GT 40 45 50 gain Transmitting amplification RGT = 12 k 47 48 49 RGT = 27 k 39.8 41.8 GT Frequency response IL 14 mA, GT 0.5 f = 300 to 3400 Hz Gain change with current Pin 31 open GT 0.5 IL = 14 to 100 mA Gain deviation Tamb = – 10 to + 60°C GT 0.5 CMRR of microphone CMRR 60 80 amplifier Input resistance of MIC RGT = 12 k Ri 50 amplifier RGT = 27 k 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 F w Noise at line psophometrically weighted Anti-clipping attack time release time 14 " " " IL > 14 mA GT = 48 dB CTXA = 1 F each 3 dB overdrive no 24 – 80 0.5 9 Preliminary Information –72 dBmp ms 24 Rev. A1: 24.01.1995 U4092B TELEFUNKEN Semiconductors Parameters Gain at low operating current Distortion at low operating current Line loss compensation 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 Min. GT 40 Typ. dt GTI D – 6.4 – 5.8 Max. Unit Figure 42.5 dB 24 5 % 24 – 5.2 dB 24 dB 24 dB 24 dB 23 dB 23 dB 23 dB 23 dB dB Vrms 23 23 23 dB 23 w Mute suppression GTM 60 80 a) MIC muted (microphone ppreamplifier 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 w v v Rev. A1: 24.01.1995 " " " w w w Preliminary Information 23 Vrms mA (peak) dBmp W dB 23 23 23 23 15 U4092 Parameters Gain at low operating current AC impedance Distortion at low operating current Speaker amplifier Minimum line current for operation Input resistance Gain from SAI to SAO Output power TELEFUNKEN Semiconductors 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. Typ. Max. Unit GR –8 –7 –6 dB Zimp Zimp 570 840 600 900 640 960 W W 23 dR 5 % 23 ILmin 15 mA 27 22 kW 14 GSA Figure 23 27 27 dB 35.5 36.5 –3 37.5 27 PSA PSA nSA 3 7 20 mW 200 mVpsoph 27 DGSA "1 dB 27 VSAO – 60 dBm 27 2 dB MW 27 27 " 0.5 dB 27 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 ms ms 27 27 dB 25 dB 25 Gain deviaton dB 25 Output noise (Input SAI open) psophometrically weighted Gain deviation Mute suppression Gain change with current Resistor for turning off speaker amplifier Gain change with frequency 16 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 IL = 15 mA Tamb = – 10 to + 60°C "1 DGSA RGSA 0.8 1.3 DGSA GD Preliminary Information " 0.5 Rev. A1: 24.01.1995 U4092B 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, w w w Min. 60 26 w Unit kW Figure 25 % 25 " 0.5 dB 25 50 dB 27 45 dB 27 50 dB 27 V 27 3.5 V 22 6.7 V 22 3.3 V 22 7.6 V 22 mW 26 26 0 w w Typ. 180 70 Max. 300 130 2 1.5 3.1 3.3 1.4 7 20 17.5 V 11.0 4 150 5 6 kW kW 26 26 V 26 VRING = 20V + 1.5Vrms Logic-level of frequency detector Ring detector enable Ring detector disable Rev. A1: 24.01.1995 VRING = 0 V, VB = 4 V VRING = 25 V VRING = 25 V, RFDO high VRING = 25 V, RFDO low VRFDO 0 VMPON 2.7 VMP 2.9 3.1 V 26 VMPOFF 2.2 2.35 2.5 V 26 Preliminary Information 17 U4092 Parameters PD input PD input current TELEFUNKEN Semiconductors Test conditions / Pin 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 p voltage g Input high Input low MUTX input Input current VMUTX = VMP VMUTX = GND Input p voltage g Input high Input low w Symbol Min. Typ. Ipd Unit Figure uA 28 V 28 V 28 mA mA 28 0.3 V V 28 28 30 – 30 mA mA 28 0.3 V V 28 28 9 Vpd Vpd VL 2 0.3 1.5 VL 1.9 IIMPSEL IIMPSEL VIMPSEL VIMPSEL 18 – 18 IMUTX IMUTX VMUTX VMUTX Max. VMP-0.3V 20 – 20 VMP-0.3V U4092B – control 0 0 to Z 1 to Z 1 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 Transmit-mute Z Transmit-mute Speech 1 Logic-level 0 = < (0.3 V) Z = > (1 V) < (VMP – 1 V) or (open input) 1 = > (VMP – 0.3 V) 18 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 RECATT = STI = ES = AFS = AGA = TXACL = MODE Speech For answering machine DTMF dialling Receive attenuation Input of sidetone balancing amplifier External supply Acoustical feedback supression control Automatic gain adjustment Transmit anticlipping control Preliminary Information Rev. A1: 24.01.1995 U4092B TELEFUNKEN Semiconductors 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 U4092B TELEFUNKEN Semiconductors 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 Rev. A1: 24.01.1995 Preliminary Information 4 37 RGR 68 nF 5 36 10 m F VM 6 35 3 kW VM S2 = closed: ringer mode reference figure for not connected pins S1 = closed: speech mode 3 38 1m F 1 kW VM 2 1 RGT 39 150 nF 40 220 nF VL RDC 8 9 10 31 S1 4.7 nF 32 IM 600 W 33 10 m F 22 mF 7 34 100 m F 47 nF 36 kW IL 10 29 10 m F W 11 13 28 10 m F W 220 mF 50 47 mF 1000 m F 12 U4092B 30 62 k W 47 mF 14 27 3.3 nF 2.2 mH IDC IMP 15 26 3.3 nF 68 nF 17 24 SD103A BC556 16 25 open 2 MW VMP S2 18 23 DC VRing 680 k W 19 22 RGSA VMP open 20 21 1 mF 95 9650 Mico TELEFUNKEN Semiconductors U4092B Figure 21 Basic test circuit 23 24 VL Preliminary Information 3 VMIC 4 37 RDC 7 10 m F open pins should be connected as shown in figure 21 6 34 ZEAR 35 10 m F VMP 5 36 VM 68 nF RGR VB (external supply): S1b Line detection: S1a 2 1 RGT 39 40 38 220 nF 150 nF 1 m F Mico 8 33 IL IM 9 VL V 10 29 RAGA IB 10 W 12 13 28 14 27 b a open DC VB S1 220 m F 1000 m F 47 m F 11 U4092B 30 62 k W 31 4.7 nF 32 100 m F IMP 15 26 30 k W 16 25 17 24 18 23 RGSA 19 22 20 21 1m F U4092 TELEFUNKEN Semiconductors Figure 22 DC characteristics, line detection Rev. A1: 24.01.1995 95 9649 Rev. A1: 24.01.1995 VL RGT S2 2 39 1 kW VM 3 38 4 37 5 36 V VDTMF 68 nF RGR 10 m F VM 6 35 Preliminary Information b S1 600 W 9 32 4.7 nF AC a 22 m F 8 33 10 m F VGEN RDC 7 34 ZEAR 100 mF VZEAR 220 nF 1 40 220 nF 150 nF 1 mF Mico 11 29 VLR 1000 m F 12 13 28 47 m F 14 27 IMP 15 26 16 25 17 24 18 23 VMP 19 22 1mF open 20 21 95 9648 open pins should be connected as shown in figure 21 DTMF operation:D GR = 20*log (VLR/VZEAR) dB + GR, MUTX = VMP Mute suppression: 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 V 220 m F 10 S3 RAGA U4092B 30 62 k W 31 IL 10 W IM VMP open TELEFUNKEN Semiconductors U4092B Figure 23 Receiving amplifier 25 26 VL 1 40 RGT Preliminary Information 3 38 b AC 25 k W 1 mF 2 39 S1 220 nF 150 nF 1 mF Mico S2 a b 5 36 68 nF Vmic VCM 4 37 RGR S1 6 35 ZEAR 25 k W a 10 mF VM RDC 10 mF 22 mF 600 W 7 34 8 33 100 mF 10 W 10 31 VL, dt, no V 4.7 nF 9 32 IM 29 RAGA IL 13 28 47 m F 14 27 IMP 15 26 16 25 18 23 open VMP 19 22 20 21 –1 VL (at IMPSEL = open) VL (at IMPSEL = low) VL (at MUTX = open) VL open pins should be connected as shown in figure 21 GTTX = 20*log Mute suppression: GTM = 20*log VCM + GT with S1b, S2 = closed, S3 = open VL (at MUTX = low) VL (S2 = open) VL (S2 = closed) 50 k Common mode rejection ratio: CMRR = 20*log Input resistance: Ri = Vmic VL 17 24 1 mF 95 9647 DGTI = GT (at IL = 100 mA) –GT (at IL = 14 mA), S3 = closed DGTI = GT (at IL = 100 mA) –GT (at IL = 14 mA) Gain change with current: Line loss compensation: Transmitting amplification GT = 20*log 1000 mF 12 220 m F 11 U4092B 30 S3 62 k W VMP open U4092 TELEFUNKEN Semiconductors Figure 24 Transmission amplifier Rev. A1: 24.01.1995 Rev. A1: 24.01.1995 Preliminary Information RGT VGEN3 2 39 220 nF 1 40 S3 VL AC 50 k W 3 1kW VM 38 220 nF 150 nF 1 m F Mico 4 37 V VDTMF 5 36 68 nF RGR 10 m F VM 6 RDC 35 ZEAR 7 34 10 mF 4.7 nF 8 33 100 mF 9 32 IL 10 W IM 10 31 29 V 220 mF 11 47 mF 14 27 VL 50kW: S3 = open dD 13 28 VL: S3 = closed 1000 mF 12 U4092B 30 62 k W 17 24 18 23 19 22 20 21 95 9643 Open pins should be connected as shown in figure 21 Input resistance: (VL50K / (VL – VL50k)) * 50k W 16 25 1 mF DTMF-amplifier: 20log (VL/VDTMF) dB IMP 15 26 VMP open TELEFUNKEN Semiconductors U4092B Figure 25 DTMF amplifier 27 28 39 2 40 1 3 38 4 37 68 nF 5 36 6 35 RDC 7 34 IL 8 33 10 mF 100 m F 4.7 nF 9 32 Open pins should be connected as shown in figure 21 10 31 (VMPON) and back again (VMPOFF) (S5, S3 = closed) 29 10 W 12 13 28 Preliminary Information 220 mF 50 W IMP 47mF 1000 mF VSAO 11 U4092B 30 62 k W 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 Vsao2 1) Max. output power: PSA = (S4 closed) RSAO 2) Threshold of ringing frequency detector: 15 26 2.2 mH VMP ramp S5 47 mF 14 27 V IRING 20 V V 19 22 RGSA VRING 1.5 V VRING 18 23 680 kW 17 24 SD103A BC556 68 nF 16 25 100 nF VSAI 1.8 Vpp 1 kHz DC S1 S2 ramp VRFDO 20 21 1 mF DC IRING S3 DC 20.6 V S4 U4092 TELEFUNKEN Semiconductors Figure 26 Ringing power converter Rev. A1: 24.01.1995 95 9644 Rev. A1: 24.01.1995 1 Preliminary Information 3 VMIC S1 38 4 37 68 nF VL 5 36 10 mF V 6 35 RDC ZEAR 8 33 10 mF 4.7 nF 7 34 VSAO RSAO 2 Attenuation of transmit gain: S1 = closed Open pins should be connected as shown in figure 21 Output power: PSA = Gain from SAI to SAO: 20*log (VSAO / VSAI) dB Input impedance: (VZIN/(VSAO – VZIN)) * RIN RGT 2 39 1mF RGR VM 10 W 600 W 22 m F 9 32 62 k W 29 11 IL 50 W 47 m F V 13 1000mF 12 28 10 mF U4092B 30 220 m F 10 31 10 mF IMP 15 26 16 25 VSAO, S4 = closed VZIN, S4 = open n SA 47 m F 14 27 off IINLDR IINLDT 17 24 S4 18 23 220 nF VATAFS 40 220 nF 150 nF Mico 30 k W 20 kW V 19 22 1mF 20 21 RGSA VSAI TELEFUNKEN Semiconductors U4092B Figure 27 Speaker amplifier 29 95 9646 30 1 40 RGT 2 39 5 36 68 nF Vpd 4 37 open Preliminary Information VMP 8 33 10 m F RDC 7 6 Ipd 34 35 ZEAR 100 m F IL Open pins should be connected as shown in figure 21 3 38 RGR 10 m F VM 10 W 4.7 nF 9 32 IM V 10 31 29 VL m m 13 28 1000 F 12 220 F 11 U4092B 30 62 kW m 47 F 14 27 15 26 IMP 16 25 17 24 18 20 21 VMP IIMPSEL 19 22 RGSA 23 IMUTX VMP m 1 F U4092 TELEFUNKEN Semiconductors Figure 28 Input characteristic Rev. A1: 24.01.1995 95 9645 U4092B TELEFUNKEN Semiconductors Ordering information Type U4092B-SD Package SDIP 40 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 TELEFUNKEN Semiconductors 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. 32 Preliminary Information Rev. A1: 24.01.1995