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Features
* * * * * * * * * * * * * * *
Adjustable DC Characteristics Adjustable Transmit and Receive Gain Symmetrical Input of Microphone Amplifier Anti-clipping in Transmit Direction Automatic Line-loss Compensation Built-in Ear Protection DTMF and MUTE Input Adjustable Side Tone Suppression Independent of Sending and Receiving Amplification Integrated Amplifier for Loud-hearing Operation Anti-clipping for Loudspeaker Amplifier Improved Acoustical Feedback Suppression Selectable Line Impedance Voice Switch Supply Voltages for All Functional Blocks of a Subscriber Set Operation Possible from 10-mA Line Current
Monolithic Integrated Feature Phone Circuit U4089B-M
Benefits
* Complete System Integration of Analog Signal Processing on One Chip * Very Few External Components
Applications
* * * *
Feature Phones Answering Machines Fax Machines Speaker Phones
Description
The telephone circuit U4089B-M is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, side tone equivalent and ear protection rectifiers. The circuit is line-powered and contains all components necessary for the amplification of signals and adaptation to the line. An integrated voice switch with a loudspeaker amplifier enables loud-hearing or hands-free 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. Figure 1. Simple Block Diagram
Speech circuit Audio amplifier
Voice switch
Dialer
Rev. 4570A-CORD-04/03
1
Figure 2. Block Diagram
GT 44 MIC1 MIC2 4 3
MIC TXA
STO 32 7
VL 600 W
IMPSEL AGA IND 20 30 6
SENSE V B 9 10 13
V MP
900 W Power supply
33
VM
DTMF
1
Impedance control
TX ACL
GND
8
TTXA
41
27 INLDR
26
AGA control Acoustical feedback suppression control
Current supply
I REF
31
INLDT
29
TLDR
28
TLDT
25
ATAFS 11
Transmit mute control
Supply
SAO
TSACL
21
SACL
Rattenuation
SAI
23
22 GSA MUTX
24
39 RECO GR
40 STI
36
42 RECIN
2
U4089B-M
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Pin Configuration
Figure 3. Pinning SSO44
DTMF NC MIC2 MIC1 NC IND VL GND SENSE 1 2 3 4 5 6 7 8 9 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 GT NC RECIN TTXA GR RECO NC NC STI NC NC VM STO IREF AGA TLDR TLDT INLDR INLDT ATAFS MUTX SAI
VB 10 SAO 11 NC 12
VMP 13 NC NC NC NC NC NC 14 15 16 17 18 19
IMPSEL 20 TSACL 21
GSA 22
3
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Pin Description
Pin 1 3 4 6 7 8 9 10 11 13 Symbol DTMF MIC 2 MIC 1 IND VL GND SENSE VB SAO VMP Function Input for DTMF signals. Also used for the answering machine and hands-free input. Non-inverting input of microphone amplifier Inverting input of microphone amplifier 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 affects the linelength 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 Regulated 3.3 V supply voltage for peripheral circuits. The maximum output current is 2 mA.
20
Control input for selection of line impedance 1) 600 W IMPSEL 2) 900 W 3) Mute of second transmit stage (TXA); also used for indication of external supply (answering machine); last chosen impedance is stored TSACL GSA SA I Time constant of anti-clipping of speaker amplifier Current input for setting the gain of the speaker amplifier. Adjustment characteristic is logarithmical. For RGSA > 2 MW, the speaker amplifier is switched off. Speaker amplifier input (for loudspeaker, tone ringer and hands-free use) 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 hands-free use; receive branch is not affected. Attenuation of acoustical feedback suppression. Maximum attenuation of the AFS circuit is set by a resistor at this pin. Without the resistor, AFS is switched off. Input of transmit level detector Input of receive level detector Time constant of transmit level detector Time constant of receive level detector Automatic gain adjustment with line current. A resistor connected from this pin to GND sets the starting point. Max. gain change is 6 dB. Internal reference current generation; RREF = 62 kW; IREF = 20 A Side tone reduction output. Output resistance is approximately 300 W. Maximum load impedance is 10 kW. Reference node for microphone, earphone and loudspeaker amplifier. Supply for electret microphone (IM 300 A). Input for side-tone network Output of receiving amplifier 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 anti-clipping in transmit path Input of receiving path; input impedance is typically 80 kW A resistor from this pin to GND sets the amplification of the microphone and DTMF signals; the input amplifier can be muted by applying VMP to GT.
21 22 23
24
MUTX
25 26 27 28 29 30 31 32 33 36 39 40 41 42 44
ATAFS INLDT INLDR TLDT TLDR AGA IREF STO VM STI RECO GR TTXA RECIN GT
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DC Line Interface and Supply-voltage Generation
The DC line interface consists of an electronic inductance and an output stage which charges the capacitor at 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 conditions, the PNP current source (IBOPT) supplies an extra amount of current to the supply voltages when the NPN in parallel is unable to conduct current. The U4089B-M contains a series regulator which provides a supply voltage VMP of 3.3 V at the 2 mA suitable for a microprocessor. Figure 4. DC Line Interface with Electronic Inductance and Generation of Regulated and Unregulated Supply
VL 10 W RSENSE SENSE I BOPT < 5 mA CIND 10 F IND RDC + R30 30 kW 7V V OFFS 220 F + 3.3 V V MP 3.3 V/ 2 mA
47 F
VB
5
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Figure 5. Functional Blocks for Power Supply
VB Power supply Voltage regulator 7V V MP
VL
LIDET
ES V LON
IMPED CONTR
IMPSEL
TXA TXACL
OFFSA COMP
SAL, SA SACL
AFS
MIC, DTMF AGA, RA TX MUTE MUT REC, STBAL RECATT
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 on all blocks of the chip. For line voltages below 1.9 V, the switches remain in their quiescent state as shown in Figure 5. OFFSACOMP disables the group listening feature (SAI, SA, SACL, AFS) below line currents of approximately 10 mA. 2. 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 U4089B-M offers a very efficient feedback suppression circuit which uses a modified voice switch topology. Figure 6 shows the basic system configuration. 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 whether 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 curves. The system configuration for group listening, which is realized in the U4089B-M, is illustrated in Figure 7. TXA and SAI represent the two attenuators; the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes).
6
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Figure 6. Basic Voice-switch System
TX attenuation Handset microphone
Logarithmic Hybrid Attenuation control Line
Logarithmic Loud speaker
RX attenuation
Figure 7. Integration of the Acoustic Feedback-suppression Circuit Into the Speech Circuit Environment
V B V L
GT
INLDT
TLDT
STO
VL
Z L
VBG
+ Zint
SAO
AFS control Max att.
AGA
GSA SAI SAI TLDR
+
VBG
RECIN
INLDR
RECO
GR
STI STO STN
7
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Figure 8. Acoustic Feedback Suppression by Alternative Control of Transmit and Speaker Amplifier Gain
TLDT TXA SAI
RLDT
INLDT AGA AGA
RLDR INLDR IATGSA
IAGAFS
IGSA
TLDR RATAFS
ATAFS
GSA
A detailed diagram of the AFS (Acoustic Feedback Suppression) is given in Figure 8. Receive and transmit signals are first processed by logarithmic rectifiers in order to produce the speech envelopes at TLDT and RLDT. After amplification, a decision is made by the differential pair of which direction should be transmitted. The attenuation of the controlled amplifiers TXA and SAI is determined by the emitter current IAT which is comprised of three parts: IATAFS IATGSA IAGAFS Sets maximum attenuation Decreases the attenuation when speaker amplifier gain is reduced 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 9 illustrates the principal relationship between the 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. The maximum GSA value to be used is 36 dB. The shape of the characteristic is moved in the x-direction by adjusting resistor RATAFS, thus changing ATAFS m . The actual value of the 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.
8
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Figure 9. Reducing Speaker Amplifier Gain Results in an Equal Reduction of AFS Attenuation
ATAFS (dB) ATAFSm ATAFSa RATAFS RATAFS not usable
GSAO
GSAa
36 dB GSA (dB)
Operating Range of Speaker Amplifier
The basic behavior is illustrated in Figure 10. Actual values of ILON/ILOFF vary slightly with the adjustment of the DC characteristics and the selection of the internal line impedance. Figure 10. Threshold of Speaker Amplifier
SA on
SA off
IL off
IL on
IL
Figure 11. Comparator Thresholds Depend on the DC Mask and Line Impedance
7 RDC = 6 RDC = 130 kW
VL (V)
5
4
RDC = 68 kW
3 10 12 14 IL (mA) ILON at line impedance = 600 W ILOFF at line impedance = 600 W ILON at line impedance = 900 W ILOFF at line impedance = 900 W 16 18 20
9
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Absolute Maximum Ratings
Parameters Line current DC line voltage Junction temperature Ambient temperature Storage temperature Total power dissipation, Tamb = 60C, SSO44 Symbol IL VL Tj Tamb Tstg Ptot Value 140 12 125 -25 to +75 -55 to +150 0.9 Unit mA V C C C W
Thermal Resistance
Parameters Junction ambient SSO44 Symbol RthJA Value 70 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 20 open, VMUTX = GND, unless otherwise specified. Parameters DC Characteristics IL = 2 mA IL = 14 mA IL = 60 mA IL = 100 mA 4.6 8.8 2.4 5.0 7.5 9.4 5.4 10.0 V V V V Test Conditions Pin Symbol Min. Typ. Max. Unit
DC voltage drop over circuit
VL
Transmission Amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 kW, Unless Otherwise Specified Adjustment range of transmit gain Transmitting amplification Frequency response Gain change with current Gain deviation CMRR of microphone amplifier Input resistance of MIC amplifier Distortion at line RGT = 12 kW RGT = 27 kW IL > 14 mA VL = 700 mVrms IL > 19 mA, d < 5% Vmic = 25 mV CTXA = 1 F IL > 14 mA GT = 48 dB RGT = 12 kW RGT = 27 kW IL 14 mA, f = 300 to 3400 Hz Pin 20 open (AGA), IL = 14 to 100 mA Tamb = -10 to +60C GT GT DGT DGT DGT CMRR Ri dt VLmax no 1.8 3 60 80 50 75 40 47 39.8 45 48 50 49 41.8 0.5 0.5 0.5 dB dB dB dB dB dB kW %
45
110 2
Maximum output voltage Noise at line psophometrically weighted
4.2
dBm
-80
-72
dBmp
10
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U4089B-M
Electrical Characteristics (Continued)
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 20 open, VMUTX = GND, unless otherwise specified. Parameters Anti-clipping attack time release time Test Conditions CTXA = 1 F each 3 dB overdrive IL = 10 mA IMP = 1 mA RDC = 68 kW Vmic = 1 mV IM = 300 A IL = 10 mA IM = 300 A IMP = 1 mA RDC = 68 kW Vmic = 10 mV IL = 100 mA, RAGA = 20 kW IL 14 mA Mutx = open Pin Symbol Min. Typ. 0.5 9 Max. Unit ms ms
Gain at low operating current
GT
40
42.5
dB
Distortion at low operating current
dt
5
%
Line-loss compensation Mute suppression, MIC muted (microphone preamplifier) Adjustment range of receiving gain Receiving amplification Amplification of DTMF signal from DTMF IN to RECO Frequency response Gain change with current Gain deviation Ear protection MUTE suppression DTMF operation Output voltage d 2% Maximum output current d 2% Receiving noise psophometrically weighted Output resistance Line-loss compensation AC impedance
DGTI GTM
-6.4
-5.8
-5.2
dB
60
80
dB
Receiving Amplifier, IL = 14 mA, RGR = 62 kW, Unless Otherwise Specified, VGEN = 300 mV IL 14 mA, single-ended RGR = 62 kW RGR = 22 kW IL 14 mA VMUTX = VMP IL > 14 mA, f = 300 Hz to 3400 Hz IL = 14 to 100 mA Tamb = -10 to +60C IL 14 mA VGEN = 11 Vrms IL 14 mA VMUTX = VMP IL = 14 mA Zear = 68 nF Zear = 100 W Zear = 68 nF + 100 W IL 14 mA Output against GND RAGA = 20 kW, IL = 100 mA ni Ro DGRI Zimp -7.0 840 -6.0 900 GR GR GRM DGRF DGR DGR EP DGR 60 0.5 4 -80 -77 10 -5.0 960 -8 -7.75 -7 1.5 4 +2 -6.25 dB dB dB dB dB dB Vrms dB Vrms mA (peak) dBmp W dB W
1
7 0.5 0.5 0.5 1.1
11
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Electrical Characteristics (Continued)
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 20 open, VMUTX = GND, unless otherwise specified. Parameters Test Conditions IL = 10 mA IMP = 1 mA IM = 300 A VGEN = 560 mV RDC = 68 kW IL = 10 mA IMP = 1 mA VGEN = 560 mV RDC = 68 kW Pin Symbol Min. Typ. Max. Unit
Gain at low operating current
GR
-8
-7
-6
dB
Distortion at low operating current Speaker Amplifier Minimum line current for operation Input resistance
dR
5
%
No AC signal 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 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
ILmin 14
15 22
mA kW
Gain from SAI to SAO
GSA
35.5
36.5 -3
37.5
dB dB
Output power
PSA PSA nSA DGSA
3
7 20 200
mW mW Vpsoph dB
Output noise (input SAI open) psopho-metrically weighted Gain deviation
1
Mute suppression
VSAO DGSA RGSA DGSA tr tf 5 80 0.8 1.3
-60
dBm
Gain change with current Resistor for turning off speaker amplifier Gain change with frequency Attack time of anti-clipping Release time of anti-clipping
1 2 0.5
dB MW dB ms ms
DTMF Amplifier Test Conditions: IMP = 2 mA, IM = 0.3 mA, VMUTX = VMP Adjustment range of DTMF gain IL = 15 mA Mute active IL = 15 mA, VDTMF = 8 mV Mute active: MUTX = VMP IL = 15 mA Tamb = -10 to +60C GD 40 50 dB
DTMF amplification
GD
40.7
41.7
42.7
dB
Gain deviaton
GD
0.5
dB
12
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U4089B-M
Electrical Characteristics (Continued)
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 20 open, VMUTX = GND, unless otherwise specified. Parameters Input resistance Distortion of DTMF signal Gain deviation with current Range of attenuation Test Conditions RGT = 27 kW, RGT = 15 kW IL 15 mA VL = 0 dBm IL = 15 to 100 mA IL 15 mA IL 15 mA, IINLDT = 0 A RATAFS = 30 kW IINLDR = 10 A IL 15 mA IINLDP = 0 RATAFS = 30 kW IINLDR = 10 IL 15 mA IL = 14 mA, RDC = 68 kW IMP = 2 mA IL 14 mA, IM = 300 A RDC = 130 kW IB = +20 mA, IL = 0 mA VMUTX = VMP VMUTX = GND Input high Input low DGT Pin Symbol Ri dD DGD 0 Min. 60 26 Typ. 180 70 Max. 300 130 2 0.5 50 Unit kW % dB dB
AFS Acousting Feedback Suppression
Attenuation of transmit gain
45
dB
Attenuation of speaker amplifier AFS disable
DGSA VATAFS 1.5
50
dB
V
Supply Voltages, Vmic = 25 mV, Tamb = -10 to +60C VMP VMP 3.1 3.3 3.5 V
VM VB MUTX Input (see Figure 20) Input current
VM VB
1.4
3.3
V
7
7.6
V
IMUTX IMUTX VMUTX VMUTX VMP 0.3 V
+20 -20
+30 -30
A A V
Input voltage
0.3
V
13
4570A-CORD-04/03
U4089B-M Control
MUTX 0 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
Z
For answering machine
1
DTMF dialling
IMPSEL 0 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 to Z
Transmit mute
1 to Z
Transmit mute
1
Speech
Logic Level 0 = < (0.3 V) Z = > (1 V) < (VMP - 1 V) or (open input) 1 = > (VMP - 0.3 V)
AFS = Acoustical feedback-suppression control AGA = Automatic gain adjustment TXACL = Transmit anti-clipping control ES = External supply
14
U4089B-M
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U4089B-M
Figure 12. Typical DC Characteristic
Figure 13. Typical Adjustment Range of the Transmit Gain GT (dB)
15
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Figure 14. Typical Adjustment Range of the Receive Gain
Figure 15. Typical AGA Characteristic
16
U4089B-M
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U4089B-M
Figure 16. Typical Load Characteristic of VB for a Maximum (RDC = infinity) DC Characteristic and a 3-mW Loudspeaker Output
Figure 17. Typical Load Characteristic of VB for a Medium DC Characteristic (RDC = 130 kW) and a 3-mW Loudspeaker Output
17
4570A-CORD-04/03
Figure 18. Typical Load Characteristic of VB for a Minimum DC Characteristic (RDC = 68 kW) and a 3-mW Loudspeaker Output
18
U4089B-M
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U4089B-M
Figure 19. DC Voltage Absolute
19
4570A-CORD-04/03
Figure 20. DC Voltage Current Test
20
U4089B-M
4570A-CORD-04/03
U4089B-M
Figure 21. DC Ramps
21
4570A-CORD-04/03
Figure 22. AC Tests
22
U4089B-M
4570A-CORD-04/03
VM Hook switch C2 C3 R2 13 V VM R3 R4 C4 C5 R6 C7 C8 R 26 R1 Tip
4570A-CORD-04/03
C 24 4 29 32 8 Microphone 44 7 30 6 9 10 13 33 31 Ring 3 1 C 21 41 27 26 C 18 29 C 17 28 R 18 25 C 16 11
R 25
C 23
R 24
C 25
DTMF
HF-Mic
R 23
R 22
Figure 23. Application for Hands-free Operation
RECO
C 27
R 30
C 26
R 29
LOGTX
U4089B
Loud speaker C 15 21 C 14 23 22 R 15 R 14 R 13 R 12 C 28 24 39 40
VM
R 17
36
42 VB R 11 VL R 10 R9 R8 LOGTX C 10 R 21 V MP
R 16
Earpiece
C 12
C 11 BC177 VM VM To pin 32
Microcontroller
U4089B-M
23
Table 1. Typical Values of External Components (see Figure 23)
Name C2 C3 C4 C5 C7 C8 C10 C11 C12 C14 C15 Value 4.7 nF 10 F 220 F 47 F 1 F 100 F 150 nF 68 nF 33 nF 100 nF 1 F Name C16 C17 C18 C21 C23 C24 C25 C26 C27 C28 R2 Value 47 F 10 F 10 F 1 F 6.8 nF 10 nF 100 nF 470 nF 33 nF 10 F 20 kW Name R3 R4 R6 R8 R9 R10 R11 R12 R13 R14 R15 Value >68 kW 10 kW 62 kW 22 kW 330 kW 3 kW 62 kW 30 kW 62 kW 120 kW 47 kW Name R16 R17 R18 R21 R22 R23 R24 R25 R26 R29 R30 Value 1 kW 1.2 kW 30 kW 15 kW 330 kW 220 kW 68 kW 2 kW 3.3 kW 1 kW 12 kW
Ordering Information
Extended Type Number U4089B-MFN U4089B-MFNG3 Package SSO44 SSO44 Remarks Tubes Taped and reeled
Package Information
Package SSO44
Dimensions in mm
18.05 17.80 9.15 8.65 7.50 7.30
2.35 0.3 0.8 16.8 44 23 0.25 0.10
0.25 10.50 10.20
technical drawings according to DIN specifications
1
22
24
U4089B-M
4570A-CORD-04/03
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4570A-CORD-04/03 xM

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