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TELEFUNKEN Semiconductors
U4092B
Monolithic Integrated Feature Phone Circuit
Description
The c 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 P, 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 2. 900 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 M, 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 k; IREF = 20 A Side tone reduction output. Output resistance is approximately 300 . Maximum load impedance is 10 k. 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 k
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 kW 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 = 60C 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 = 25C, 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 f = 300 to 3400 Hz Gain change with current Pin 31 open DGT IL = 14 to 100 mA Gain deviation Tamb = - 10 to + 60C DGT 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
"0.5 "0.5 "0.5
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
DGTI
- 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 f = 300 to 3400 Hz Gain change with current IL = 14 to 100 mA DGR Gain deviation Tamb = - 10 to + 60C DGR 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
"0.5 "0.5 "0.5
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 + 60C 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 + 60C 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 + 60C 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
26 26
kW kW
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
V
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 62 kW ZEAR off S4 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 10 mF 10 mF 1mF 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

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