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Features
* * * * * * * * * * * * * * * *
Adjustable DC Characteristic 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 Open-listening 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 Filters Against EMI on Critical I/O
Monolithic Integrated Feature Phone Circuit U4089B-P
Benefits
* Complete System Integration of Analog Signal Processing on One Chip * Very Few External Components * Less Components for EMI protection
Applications
* * * *
Feature Phones Answering Machines Fax Machines Speaker Phones
1. Description
The telephone circuit U4089B-P is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, sidetone 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 loudspeaker amplifier enables open-listening or hands-free operation. With an anti-feedback function, acoustical feedback during open listening can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits.
Electrostatic sensitive device. Observe precautions for handling.
Rev. 4518C-CORD-10/05
Figure 1-1.
Simple Block Diagram
Speech circuit
Audio amplifier
Voice switch
Dialer
Figure 1-2.
Block Diagram
GT
44 4 3 MIC TXA 1
STO
32
VL
7
IMPSEL AGA IND 600
20 30 6
SENSE V B
9 10
V MP
13
MIC1 MIC2
900 Power supply
33
VM
DTMF
41
Impedance control
TX ACL
8
GND
TTXA
27
INLDR INLDT TLDR TLDT ATAFS
26 29 28 25
AGA control Acoustical feedback suppression control
Current supply
31
I REF
Transmit mute control
Supply
11
SAO
21
SACL
Rattenuation
TSACL
23
SAI
22
24
39
40
36
42
GSA
MUTX
RECO
GR
STI
RECIN
2
U4089B-P
4518C-CORD-10/05
U4089B-P
2. Pin Configuration
Figure 2-1. Pinning SSO44
RECIN
ATAFS
INLDR
INLDT
RECO
TTXA
IREF
AGA
STO
MUTX 24 TSACL 21
TLDR
TLDT
GR
STI
NC
VM
NC
NC
NC
GT
30
29
27
26
44
43
42
41
40
39
37
35
34
33
38
36
32
31
28
25
NC 12
VMP 13
NC 14
NC 15
NC 16
NC 17
NC 18
NC 19
IMPSEL 20
Table 2-1.
Pin 1 3 4 6 7 8 9 10 11 13
Pin Description
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 affects 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 7V. Output of loudspeaker amplifier. Regulated supply voltage 3.3V for peripheral circuits. The maximum output current is 2 mA. Control input for selection of line 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. 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 M, the speaker amplifier is switched off. Speaker amplifier input (for loudspeaker, tone ringer and hands-free use).
20
IMPSEL
21 22 23 Note:
TSACL GSA SAI
Filters against electromagnetic interference (EMI) are located at pins MIC1, MIC2, RECIN and STI.
SENSE
DTMF
MIC2
MIC1
GND
GSA 22
SAO 11
NC
NC
IND
VB 10
1
2
3
4
5
6
7
8
VL
9
23
SAI
NC
3
4518C-CORD-10/05
Table 2-1.
Pin
Pin Description (Continued)
Symbol Function 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 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. Maximum gain change is 6 dB. 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). 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 k. 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.
24
MUTX
25 26 27 28 29 30 31 32 33 36 39 40 41 42 44 Note:
ATAFS INLDT INLDR TLDT TLDR AGA IREF STO VM STI RECO GR TTXA RECIN GT
Filters against electromagnetic interference (EMI) are located at pins MIC1, MIC2, RECIN and STI.
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3. 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 x CIND x (RDC x 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-P contains a series regulator which provides a supply voltage VMP of 3.3V at 2 mA suitable for a microprocessor. Figure 3-1. DC Line Interface With Electronic Inductance and Generation of Regulated and Unregulated Supply
10 RSENSE SENSE I BOPT < 5 mA CIND 10 F + IND RDC R30 30 k 7V V OFFS + 3.3V V MP 3.3V/ 2 mA
VL
47 F
VB 220 F
Figure 3-2.
Functional Blocks for Power Supply
VB Power supply Voltage regulator 7V V MP
VL
ES LIDET V LON
IMPED CONTR
IMPSEL
TXA TXACL
OFFSA COMP
SAL, SA SACL
AFS
MIC, DTMF AGA, RA TX MUTE MUT REC, STBAL RECATT
5
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1. In speech condition, the system is supplied by the line current. If the LIDET block detects a line voltage above the fixed threshold (1.9V), the internal signal VLON is activated, thus switching on all blocks of the chip. For line voltages below 1.9V, the switches remain in their quiescent state as shown in Figure 3-2. 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 on the ES line.
4. Acoustic Feedback Suppression
Acoustical feedback from the loudspeaker to the handset microphone may cause instability in the system. The U4089B-P offers a very efficient feedback suppression circuit which uses a modified voice switch topology. Figure 4-1 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-P, is illustrated in Figure 4-2. TXA and SAI represent the two attenuators; the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes). Figure 4-1. Basic Voice-switch System
TX attenuation Handset microphone
Logarithmic Hybrid Attenuation control Line
Logarithmic Loud speaker
RX attenuation
6
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U4089B-P
Figure 4-2. Integration of the Acoustic Feedback-suppression Circuit Into the Speech Circuit Environment
V B V L Z L
GT
INLDT
TLDT
STO
VL
VBG
+ Zint
SAO
AFS control Max att.
AGA
GSA SAI SAI TLDR
+
VBG
RECIN
INLDR
RECO
GR
STI STO STN
Figure 4-3.
Acoustic Feedback Suppression by Alternative Control of Transmit and Speaker Amplifier Gain
TLDT TXA SAI
RLDT
INLDT AGA
AGA IAGAFS INLDR
RLDR IATGSA
IGSA
TLDR RATAFS
ATAFS
GSA
7
4518C-CORD-10/05
Figure 4-3 on page 7 provides a detailed diagram of the AFS (Acoustic Feedback Suppression). 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 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 G = IAT x 0.67 dB/A Figure 4-4 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. 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 ATAFSm. 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. Figure 4-4. Reducing Speaker Amplifier Gain Results in an Equal Reduction of AFS Attenuation
ATAFS (dB) ATAFS m ATAFS a RATAFS RATAFS not usable
GSA o
GSA a
36 dB
GSA (dB)
8
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U4089B-P
5. Operating Range of Speaker Amplifier
The basic behavior is illustrated in Figure 5-1. Actual values of ILON/ILOFF vary slightly with the adjustment of the DC characteristics and the selection of the internal line impedance. Figure 5-1. Threshold of Speaker Amplifier
SA on
SA off IL off IL on IL
Figure 5-2.
Comparator Thresholds Depend on DC Mask and Line Impedance
7 RDC =
6 RDC = 130 k
VL ( V )
5
RDC = 68 k 4
3 10.0
12.0
14.0
16.0
18.0
20.0
I L ( mA )
= ILON at line impedance = 600 Ohm = ILOFF at line impedance = 600 Ohm = ILON at line impedance = 900 Ohm = ILOFF at line impedance = 900 Ohm
9
4518C-CORD-10/05
6. Absolute Maximum Ratings
Parameters Line current DC line voltage Junction temperature Ambient temperature Storage temperature Total power dissipation, Tamb = 60 C, SSO44 ESD (Human Body Model), ESD S 5.1 Standard ESD (Machine Model), JEDEC A115A Symbol IL VL Tj Tamb Tstg Ptot VESD VESD Value 140 12 125 -25 to +75 -55 to +150 0.9 1.5 150 Unit mA V C C C W kV V
7. Thermal Resistance
Parameters Junction ambient Symbol RthJA Value 70 Unit K/W
8. 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 30 open (AGA), VMUTX = GND, see Figure 8-11 on page 22 (AC tests), unless otherwise specified. Parameters Test Conditions IL = 2 mA IL = 14 mA IL = 60 mA IL = 100 mA Pin Symbol Min. Typ. 2.4 5.0 7.5 9.4 Max. Unit V V V V DC Characteristics (see Figure 8-8 on page 19) 4.6 8.8 5.4 10.0
DC voltage drop over circuit
VL
, Transmission Amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 k 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 k RGT = 27 k IL > 14 mA VL = 700 mVrms IL > 19 mA, d < 5% Vmic = 25 mV CTXA = 1 F RGT = 12 k RGT = 27 k IL 14 mA, f = 300Hz to 3400Hz Pin 30 open (AGA), IL = 14 mA to 100 mA Tamb = -10 C to +60 C GT GT GT GT GT CMRR Ri dt VLmax 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 k %
45
110 2
Maximum output voltage
4.2
dBm
10
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U4089B-P
8. Electrical Characteristics (Continued)
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 30 open (AGA), VMUTX = GND, see Figure 8-11 on page 22 (AC tests), unless otherwise specified. , Parameters Noise at line psophometrically weighted Anti-clipping attack time release time Test Conditions IL > 14 mA GT = 48 dB CTXA = 1 F each 3 dB overdrive IL = 10 mA IMP = 1 mA RDC = 68 k Vmic = 1 mV IM = 300 A IL = 10 mA IM = 300 A IMP = 1 mA RDC = 68 k Vmic = 10 mV IL = 100 mA, RAGA = 20 k IL 14 mA Mutx = open Pin Symbol no Min. Typ. -80 Max. -72 Unit dBmp
0.5 9
ms ms
Gain at low operating current
GT
40
42.5
dB
Distortion at low operating current
dt
5
%
Line-loss compensation Mute suppression a) 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
GTI
-6.4
-5.8
-5.2
dB
GTM
60
80
dB
Receiving Amplifier, IL = 14 mA, RGR = 62 k, unless otherwise specified, VGEN = 300 mV IL 14 mA, single ended RGR = 62 k RGR = 22 k IL 14 mA VMUTX = VMP IL > 14 mA, f = 300Hz to 3400Hz IL = 14 mA to 100 mA Tamb = -10 C to +60 C IL 14 mA VGEN = 11Vrms IL 14 mA VMUTX = VMP IL = 14 mA Zear = 68 nF Zear = 100 Zear = 68 nF + 100 IL 14 mA Output against GND RAGA = 20 k , IL = 100 mA ni Ro GRI Zimp -7.0 840 -6.0 900 GR GR GRM GRF GR GR EP GR 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 dB
1
7 0.5 0.5 0.5 1.1
11
4518C-CORD-10/05
8. Electrical Characteristics (Continued)
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 30 open (AGA), VMUTX = GND, see Figure 8-11 on page 22 (AC tests), unless otherwise specified. , Parameters Test Conditions IL = 10 mA IMP = 1 mA IM = 300 A VGEN = 560 mV RDC = 68 k IL = 10 mA IMP = 1 mA VGEN = 560 mV RDC = 68 k 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 23 VSAI = 3 mV, IL = 15 mA, RGSA = 560 k RGSA = 20 k Load resistance , RL = 50 d < 5% VSAI = 20 mV IL = 15 mA IL = 20 mA IL > 15 mA IL = 15 mA Tamb = -10 C to +60 C IL = 15 mA, VL = 0 dBm, VSAI = 4 mV Pin 23 open IL = 15 mA to 100 mA IL = 15 mA to 100 mA IL = 15 mA f = 300Hz to 3400Hz 20 dB overdrive
ILmin 14
15 22
mA k
Gain from SAI to SAO
GSA
35.5
36.5 -3
37.5
dB dB
Output power
PSA PSA nSA GSA
3
7 20 200
mW mW Vpsoph dB
Output noise (input SAI open) psophometrically weighted Gain deviation
1
Mute suppression
VSAO GSA RGSA GSA 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 M dB ms ms
TMF 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 C to +60 C 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-P
8. Electrical Characteristics (Continued)
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 30 open (AGA), VMUTX = GND, see Figure 8-11 on page 22 (AC tests), unless otherwise specified. , Parameters Input resistance Distortion of DTMF signal Gain deviation with current Range of attenuation Test Conditions RGT = 27 k , RGT = 15 k IL 15 mA VL = 0 dBm IL = 15 mA to 100 mA IL 15 mA IL 15 mA, IINLDT = 0 A RATAFS = 30 k IINLDR = 10 A IL 15 mA IINLDP = 0 RATAFS = 30 k IINLDR = 10 IL 15 mA IL = 14 mA, RDC = 68 k IMP = 2 mA IL 14 mA, IM = 300 A RDC = 130 k IB = +20 mA, IL = 0 mA VMUTX = VMP VMUTX = GND Input high Input low GT Pin Symbol Ri dD GD 0 Min. 60 26 Typ. 180 70 Max. 300 130 2 0.5 50 Unit k % dB dB
AFS Acousting Feedback Suppression
Attenuation of transmit gain
45
dB
Attenuation of speaker amplifier AFS disable
GSA VATAFS 1.5
50
dB
V
Supply Voltages, Vmic = 25 mV, Tamb = -10 C to +60 C VMP VMP 3.1 3.3 3.5 V
VM VB
VM VB
1.4
3.3
V
7
7.6
V
MUTX Input (see Figure 8-9 on page 20) Input current IMUTX IMUTX VMUTX VMUTX VMP - 0.3V 0.3 +20 -20 +30 -30 A A V V
Input voltage
13
4518C-CORD-10/05
Table 8-1.
U4089B-P Control
MUTX MODE Speech MIC1, MIC2 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
0
Z
For answering machine
1
DTMF dialling
IMPSEL 0 Line impedance = 600 TXA = on ES = off Line impedance = 600 TXA = off ES = on Line impedance = 900 TXA = off ES = on Line impedance = 900 TXA = on ES = off
MODE Speech
0 to Z
Transmit mute
1 to Z
Transmit mute
1
Speech
Logic level 0 = < (0.3V) Z = > (1V) < (VMP - 1V) or (open input) 1 = > (VMP - 0.3V)
AFS = Acoustical feedback-suppression control AGA = Automatic gain adjustment TXACL = Transmit anti-clipping control ES = External supply
14
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U4089B-P
Figure 8-1. Typical DC Characteristic
Figure 8-2.
Typical Adjustment Range of the Transmit Gain
GT (dB)
RGT (kohm)
15
4518C-CORD-10/05
Figure 8-3.
Typical Adjustment Range of the Receive Gain
Figure 8-4.
Typical AGA Characteristic
16
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U4089B-P
Figure 8-5. Typical Load Characteristic of VB for a Maximum (RDC = infinity) DC Characteristic and a 3-mW Loudspeaker Output
Figure 8-6.
Typical Load Characteristic of VB for a Medium DC Characteristic (RDC = 130 k) and a 3-mW Loudspeaker Output
17
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Figure 8-7.
Typical Load Characteristic of VB for a Minimum DC Characteristic (RDC = 68 k) and a 3-mW Loudspeaker Output
18
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U4089B-P
Figure 8-8. DC Voltage Absolute
RGS 44 GT GT RECIN open S5 CMIC 68N IDIO 1 DTMF 42 CRIN 47N CTXA 1U RGR RH 4 MIC1 RECO 39 100 CH 68N
TTXA 41 GR 40
3 MIC2
RDC 10U CIND S4 IL S1 VB DC 6 IND 7 VL 8 GND 9 SENSE RSENSE 10 VB RSAO 100K VM 33 10 b c STI 36 3K VM 2MEG 2MEG on adapter cause of stability RNW2
IB
CB
s2a
CM 100U IM
11 SAO STO 32 IREF 31 AGA 30 TLDR 29 CLDR 1N CLDT 1N open
RREF 62K RAGA
CMP 4.7U RVMP 1.65K
TLDT 28 13 VMP INLDR 27
2.2N
2.2N INLDT ATAFS 26
VIMPSEL
25
RATAFS VMU TX
MUTX 24 + 20 IMPSEL SAI 23 GSA 22
+
DC
open RGSA
21 TSACL CSACL 1U
VL DC
19
4518C-CORD-10/05
Figure 8-9.
DC Voltage Current Test
RGS U7 open VL 44 GT GT RECIN 1 DTMF 42 CRIN 47N CTXA 1U S10 DC + VTXA + ISTIHS VAGA DC ITXA on adapter cause of stability
4518C-CORD-10/05
TTXA 41
3 MIC2 CMIC 68N GR 40 4 MIC1 RECO 39 RDC 10U CIND 6 IND 7 VL 8 GND 9 SENSE RSENSE 10 VB RSAO 100K 10 b S6
RGR RH 100 VM
CH 68N
S1 DC + VB
STI 36 3K
IM
CB
VM 33
a
CM 100U
s2
11 SAO
ISTO S12 STO 32
IREF 31 AGA 30 TLDR CMP 4.7U RVMP 1.65K 29 CLDR 1N CLDT 1N
RREF 62K RAGA S5
TLDT 28 13 VMP INLDR 27
2.2N
2MEG
2.2N INLDT ATAFS 26
2MEG
25
RATAFS VMU TX
MUTX 24 20 CSACL 1U IMPSEL SAI 23 GSA 22
+
open RGSA
21 TSACL
VSACL
DC
20
U4089B-P
ISACL
S4
+
IAGA
VSTO DC
ID C +
VM
RNW2
S8
IL
DC
U4089B-P
Figure 8-10. DC Ramps
RGS 44 GT GT RECIN open 1 DTMF 42 CRIN 47N CTXA 1U RGR RH 4 MIC1 RECO 39 100 CH 68N
VL
TTXA 41 GR 40
VL
RDC 10U CIND s4 6 IND RNW2 7 VL 8 GND 9 SENSE RSENSE 10 VB VM 33 10 b STI 36 3K VM
DC
+
IL
DC
+ VB
s1
CMIC 68N
3 MIC2
CB RSAO 100K a S4 b
CM 100U
a
s2
IM
11 SAO STO 32 IREF 31 AGA 30 TLDR 29 CLDR 1N CLDT 1N on adapter cause of stability 2MEG offen RREF 62K RAGA
+ ILCUR 4.7U
DC
CMP 4.7U s5
TLDT 28 13 VMP INLDR 27
1.65K + VMP DC
2.2N
2.2N INLDT ATAFS 26
2MEG
VIMPSEL
25
RATAFS VMU TX + DC
MUTX 24 + 20 IMPSEL SAI 23 GSA 22
DC
offen RGSA
21 TSACL 1U CSACL
21
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Figure 8-11. AC Tests
RGS 44 GT GT RECIN open 1 DTMF 42 CRIN 47N CTXA 1U RGR RH 4 MIC1 RECO 39 100 CH 68N
VL
TTXA 41 GR 40
VL
RDC s4 10U CIND 6 IND 7 VL 8 GND 9 RSENSE 10 b SENSE IM 62K RAGA CLDR 1N CLDT 1N 2MEG on adapter cause of stability
4518C-CORD-10/05
DC
+
CMIC 68N
3 MIC2
IL
STI 36 3K
DC
VB
CB RSAO b 100K a S4
10 VB
VM 33
CM 100U
a
s2
11 SAO STO 32 IREF 31 AGA 30 TLDR 29 open RREF
+ ILCUR
DC
4.7U TLDT 28 1.65K + VMP DC s5 13 VMP INLDR 27
2.2N
2.2N INLDT ATAFS 26
2MEG
VIMPSEL
25
RATAFS VMU TX
DC
+
20
IMPSEL
SAI 23 GSA 22
open RGSA
21 TSACL CSACL 1U
22
U4089B-P
DC
MUTX 24
+
IDC
VM
RNW2
s1
+
U4089B-P
Table 8-2.
Name C2 C3 C4 C5 C7 C8 C10 C11 C12 C14 C15
Typical Values of External Components (see Figure 8-12 on page 24)
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 k Name R3 R4 R6 R8 R9 R10 R11 R12 R13 R14 R15 Value >68 k 10 k 62 k 22 k 330 k 3 k 62 k 30 k 62 k 120 k 47 k Name R16 R17 R18 R21 R22 R23 R24 R25 R26 R29 R30 Value 1 k 1.2 k 30 k 15 k 330 k 220 k 68 k 2 k 3.3 k 1 k 12 k
23
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Figure 8-12. Application for Hands-free Operation
24
VM hook switch C2 C3 C4 R3 VM R4 R6 C5 C8 C7 R2 13 V R 25 C 25 C 24 4 29 Microphone 44 32 7 30 6 9 10 3 33 8 31 Ring R 26 R1 Tip 3 1 C 21 41 R 30 27 R 29 26 C 18 29 C 17 28 R 18 25 C 16 11
C 23
R 24
U4089B-P
U4089B-P
C 15 21 C 14 23 R 17 22 R 15 R 14 R 13 R 12 C 28 24 39 R 16 40 36 42 VB R 11 VL R 10 Earpiece R9 C 12 R8 C 11 BC177 VM VM to pin 32 LOGTX C 10 R 21 Micro controller V MP
DTMF
HF-Mic
R 23
R 22
RECO
C 27
C 26
LOGTX
Loud speaker
VM
4518C-CORD-10/05
U4089B-P
9. Ordering Information
Extended Type Number U4089B-PFNY U4089B-PFNG3Y Package SSO44 SSO44 Remarks Tubes, Pb-free Taped and reeled, Pb-free
10. 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
25
4518C-CORD-10/05
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4518C-CORD-10/05

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