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ICs for Telephone
AN6175K
Hands-free Speech Network IC
s Overview
The AN6175K is a speech network IC incorporating a hands-free function. It provides for a high-quality handsfree telephone or handset telephone. The hands-free telephone function(HF)includes : * MIC amplifier capable of mute and gain control * Background noise monitoring * Voice switching attenuation control * Symmetrical transmitter/receiver attenuators * Dynamic loudspeaker amplifier The handset telephone function(HF)includes: * Automatic pad capable of detecting transmission distance * MIC amplifier * Receiver preamplifier * Dynamic loudspeaker amplifier
AN6175K
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 13.70.3 4.760.25
+0.1 5 0.0
Unit : mm 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 0.50.1 0.960.25 3.30.25
0.3 -
36.80.3
3 15
15.30.25
s Features
* Provides all the functions required of a hands-free or handset telephone. * Can operate on line voltage (requiring no external power supply). * Consumes minimal current. * Provides for an external filter ensuring a wide range of howling suppression. * Mute mode for hands-free operation * Background noise monitoring to improve transmission quality * 100 mW loudspeaker output (at IL=100mA) * Built-in power supply and low-voltage regulator * DIP package with 42-pins or QFH package with 44-pins
SDIP package with 42 pins (SDIP042-P-0600A)
1.778
0.90.25
1
AN6175K
Vr SP Pre VCC Vr RAPC Vr
CONT
+ - - + +
BGR
INT
+
TAPC
ATT CONT COUNT2 Vr Vr
+ - - +
COUNT1
TND
Vr
TATT RATT
LOG5 LOG1 MAO (HS) TND 5 6 7 8 9 10 TVR TLI1 TLI2 RLI1 RLI2 11 4 LOG2 LOG4 LOG3
MAO (HF) 2 3
MAI (HF)
MAI (HS)
TLO1 12
TLO2 13
RLO1 RLO2 14
REC- CONT 15 16
RVR 17
ATC 18
1
41 40 40
-
2
VL IL VCC1
33
+
s Block Diagram
42 VCC1 BGR TRE TRB VCC2 HFI MFI ST Vr HS/HF HS,HF RPI /MF RPO VSP SPI FB SPO1
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23 SPO2
+ -
22 GND Vr
-
SOUT
DO
SP
TAO 19
RAO 20
APC
41
DI 21
ICs for Telephone
ICs for Telephone
s Pin Descriptions
Pin No. Symbol MAO 1 (HF) MAI 2 (HF) MAI 3 (HS) MAO 4 (HS) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 TND TVR TLI1 TLI2 RLI1 RLI2 TLO1 TLO2 RLO1 RLO2 Description MIC amp. output (hands-free mode) MIC amp. input (hands-free mode) MIC amp. input (handset mode) MIC amp. output (handset mode) Hands-free mode transmission noise detection Noise detection reference LOG amp. (1) input (from MIC amp. output) LOG amp. (2) input (from hands-free control output) LOG amp. (4) input (from receiver preamp. output) LOG amp. (3) input (from loudspeaker amp. output) LOG amp. (1) output LOG amp. (2) output LOG amp. (3) output LOG amp. (4) output Pin No. Symbol 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 DO GND SPO2 SPO1 FB SPI VSP RPO RPI Description Receiver amp. output Ground Loudspeaker amp. (2) output Loudspeaker amp. (1) output Loudspeaker amp. input (-) Loudspeaker amp. input (+) Loudspeaker amp. power input Receiver preamp. output Receiver preamp. input
AN6175K
HS, Mode switching (handset or hands-free/MF) HF/MF HS/HF Vr ST MFI HFI VCC2 TRB TRE BGR VCC1 SOUT Mode switching (handset/hands-free) Reference for handset or hands-free mode To the base of the power supply transistor MF input From transmitter att. output (hands-free mode) Transmission amp. AC impedance setting To the base of the transmission transistor To the emitter of the transmission transistor Band-gap ref. voltage output Power output to the handset and hands-free circuits Hands-free control output
REC- Receiver switching (hands-free mode) CONT RVR ATC TAO RAO APC DI Receiver att. gain control Receiver att. switching control Transmitter att. output (hands-free mode) Receiver att. output (hands-free mode) Auto. PAD current control (handset mode, MF) Receiver amp. input (-)
s Absolute Maximum Ratings (Ta=25C)
Parameter Supply voltage Supply current Power dissipation Note) Operating ambient temperature Storage temperature Note) In an open condition with Ta=25C Symbol VCC2 IL PD Topr Tstg Rating 12.0 120 1016 -20 to + 75 -55 to + 150 Unit V mA mW C C
3
AN6175K
s Electrical Characteristics (Ta=252C)
Parameter HS power supply HS mode line voltage (1) HS mode line voltage (2) HS mode VCC2 voltage (1) HS mode VCC2 voltage (2) HS mode VCC1 voltage (1) HS mode VCC1 voltage (2) HF power supply HF mode line voltage (1) HF mode line voltage (2) HF mode VCC2 voltage (1) HF mode VCC2 voltage (2) HF mode VCC1 voltage (1) HF mode VCC1 voltage (2) HS transmitter Trans. amp. gain Trans. amp. distortion Trans. amp. max output Trans. amp. noise Trans. level auto. PAD MF trans. amp. gain MF trans. amp. distortion MF trans. amp. max output MF trans. amp. auto. PAD HS receiver Rec. amp. gain Rec. amp. distortion Rec. amp. max output Rec. amp. noise Rec. amp. auto. PAD GHR THR VHR NHR APR Vin3= -35dBm Vin3= -35dBm THR= 5% Rg=2k with a CCITT filter Gain Difference with Vin3= -35dBm, IL= 20 to 120mA -10 17 GHS THS VHS NHS APS GMF TMF VMF APMF Vin1= -30dBm Vin1= -30dBm THS= 5% Rg= 2k with a CCITT filter Gain Difference with Vin1= -30dBm, IL= 20 to 120mA Vin2= -30dBm Vin2= -30dBm TMF= 5% Gain Difference with Vin2= -30dBm, IL= 20 to 120mA 0 4 - 0.5 27 VLF1 VLF2 VCF21 VCF22 VCF11 VCF12 SW1/2=a/b, IL= 20mA, VL voltage SW1/2=a/b, IL= 120mA, VL voltage SW1/2=a/b, IL= 20mA, DC voltage at pin37 SW1/2=a/b, IL= 120mA, DC voltage at pin37 SW1/2=a/b, IL= 20mA, DC voltage at pin41 SW1/2=a/b, IL= 120mA, DC voltage at pin41 3.6 9.5 3.3 8.3 1.6 4.4 VLS1 VLS2 VCS21 VCS22 VCS11 VCS12 SW1,2 : a IL= 20mA, VL voltage SW1/2 : a/a IL= 120mA, VL voltage SW1/2 =a/a, IL= 20mA, DC voltage at pin37 SW1/2 =a/a, IL= 120mA, DC voltage at pin37 SW1/2 =a/a, IL= 20mA, DC voltage at pin41 SW1/2 =a/a, IL= 120mA, DC voltage at pin41 3.6 9.5 3.3 8.3 1.6 4.4 Symbol Condition min
ICs for Telephone
typ
max
Unit
4.0 10.5 3.7 9.3 2.0 4.8
4.4 11.5 4.1 10.3 2.4 5.2
V V V V V V
4.0 10.5 3.7 9.3 2.0 4.8
4.4 11.5 4.1 10.3 2.4 5.2
V V V V V V
29 0.3 2.5
31 2.0 -65
dB % dBm dBm dB dB % dBm
4 27
6 29 0.3 3.0 6
8 31 2.0
8
dB
19 1.5 -7
21 5 -75
dB % dBm dBm dB
4
6
8
Note: Unless otherwise specified, IL=20 mA and fin=1 kHz.
4
ICs for Telephone
s Electrical Characteristics (cont.) (Ta=252C)
Parameter HF transmitter Trans. gain (1) Trans. gain (2) Trans. noise Trans. att. gain (1) Trans. att. gain range (1) Trans. att. idling gain (1) Trans. att. gain (2) Trans. att. gain range (2) Trans. att. idling gain (2) HF receiver Rec.gain (1) Rec. gain (2) Rec. distortion Rec. max output (1) Rec. max output (2) Rec. noise Rec. att. gain (1) Rec. att. gain range (1) Rec. att. idling gain (1) Rec. att. gain (2) Rec. att. gain range (2) Rec. att. idling gain (2) Rec. att. volume characteristics GFR1 GFR2 TSP VSP1 VSP2 NFR GRA MAX1 GRA MIN1 GRA IDL1 GRA MAX2 GRA MIN2 GRA IDL2 GRA VRM Vin3= -50dBm IL=20mA Vin3= -50dBm IL=120mA Vin3= -50dBm IL=20mA TSP=5%, IL=20mA TSP=5%, IL=120mA Rg=2k, IL=20mA with a CCITT filter Vin3= - 40dBm IL=20mA Vin3= - 40dBm IL=20mA Vin3= - 40dBm IL=20mA Vin3= - 40dBm IL=120mA Vin3= - 40dBm IL=120mA Vin3= - 40dBm IL=120mA Vin3= - 40dBm IL=20mA 34 40 37 43 1.5 -10 4 -7 7 GFS1 GFS2 NFS GTA MAX1 GTA MIN1 GTA IDL1 GTA MAX2 GTA MIN2 GTA IDL2 Vin4= -65dBm IL=20mA Vin4= -65dBm IL=120mA Rg=2k, IL=20mA with a CCITT filter Vin4= -60dBm IL=20mA Vin4= -60dBm IL=20mA Vin4= -60dBm IL=20mA Vin4= -60dBm IL=20mA Vin4= -60dBm IL=20mA Vin4= -60dBm IL=20mA 57 63 60 66 Symbol Condition min typ
AN6175K
max Unit
63 69 -58
dB dB dBm dB dB
28 45 1 33 47 3
31 48 4 36 50 6
34
7 39
dB dB dB
9
dB
40 46 5.0
dB dB % dBm dBm
-60 9 49 -15 14 53 -13 -4 12 52 -12 17 56 -10 -2 -7 0 -9 20 15
dBm dB dB dB dB dB dB dB
s Electrical Characteristics (Design Values for Reference) (Ta=252C)
Parameter HS power supply HS mode internal reference voltage (1) HS mode internal reference voltage (2) HS mode internal reference voltage (3) HS mode AC impedance Vrs VSPS VBGS ZACS Pin31 high, Pin32 high, IL=20mA Pin31 high, Pin32 high, IL=20mA Pin31 high, Pin32 high, IL=20mA Pin31 high, Pin32 high, IL=20mA 1.0 2.0 1.17 610 V V V Symbol Condition Design value Unit
5
AN6175K
ICs for Telephone
s Electrical Characteristics (Design Values for Reference) (cont.) (Ta=252C)
Parameter HF power supply HF mode internal reference voltage (1) HF mode internal reference voltage (2) HF mode internal reference voltage (3) HF mode AC impedance Control voltage Low level High level VrF VSPF VBGF ZACF Pin31 high, Pin32 low, IL=20mA Pin31 high, Pin32 low, IL=20mA Pin31 high, Pin32 low, IL=20mA Pin31 high, Pin32 low, IL=20mA 1.0 2.0 1.17 610 V V V Symbol Condition Design value Unit
VC (L) VC (H)
- 0.3 to + 0.5 1.0 to 5.0
V V
Note) These values are for reference only (not guaranteed values).
s Mode Control
Pin No. 31 HF, HS/MF 0 0 0 0 1 1 1 1 32 HS/MF 0 0 1 1 0 0 1 1 15 REC- CONT 0 1 0 1 0 1 0 1 Transmit MF in the hands-free mode. Trans./rec. att. can be changed according to input level. Transmit MF in the hands-free mode. Trans./rec. att. is available only in the receiver mode. Transmit MF in the handset mode. Transmit MF in the handset mode. Speech in the hands-free mode Speech in the hands-free mode. Trans./rec. att. is available only in the receiver mode. Speech in the handset mode Speech in the handset mode Description
Where 0 means connection to GND, and 1 means connection to Pin41(VCC1).
s ES-42D Package Power Dissipation PD Ta
(mW) 1,800 1,600
Power Dissipation (PD)
1,400 1,200 1016 1,000 800 600 400 200 0 0 25 50 75
Open condition Rthj-- a=123C/W PD=1016mW(25C)
100
125
Ambient Temperature (Ta)
150 (C)
6
ICs for Telephone
s Operation in the Hand-free Mode * Block Diagram
Trans. Attenuator
AN6175K
MIC
TLOG1
MIC Level Monitor
Noise Level Monitor
Trans. Level Monitor
TLOG2
C1
Attenuator Control
Line Interface C2 Rec. Level Monitor RLOG1
RLOG1 SP
SP Level Monitor
Rec. Attenuator
s Attenuator Control
Input signal C1 TX TX RX RX TX TX RX -- C2 TX RX TX RX TX RX TX -- Trans. noise REC- CONT TX TX TX -- noise noise noise -- 0 0 0 0 0 0 0 1 Transmitter mode High-speed switching idle mode High-speed switching idle mode Receiver mode Low-speed switching idle mode Low-speed switching idle mode Low-speed switching idle mode Receiver mode Operation mode
C1 : Output comparison between TLOG1 and RLOG1. C2 : Output comparison between TLOG2 and RLOG2.
s Trans./Rec. Switching Characteristics
Idle Mode
Receiver Gain Gain
Transmitter Gain
7
AN6175K
1.Setting
(1) Setting the Line Path
ICs for Telephone
1--1 Setting the DC Characteristics The AN6175K can be made compatible with local telephone regulations by setting the following characteristics : 1. Gradient of the IL--VL characteristics 2. Degree of shifting of the IL--VL characteristics How to set the above characteristics is described below.
1. Setting the gradient of the IL-VL characteristics Referring to Fig.1--1, the resistance of R34 is 27(standard)as with the current application board. * If R34's resistance is decreased, the gradient decreases. * If R34's resistance is increased, the gradient increases. Also see Fig.1--2.
VCC2 37 R33 TRB 38 MIC amp. TRE 39 Q3
VCC1 C38
VL ZL= 600
VCC1 R34
AN6175K
Fig.1--1 Line Output Block Diagram
12 R34=33 11.8V
Higher than standard
VL (V) 4.2V 3.95V 3.6V
R34=27 10.6V (standard) R34=20 8.7V
Lower than standard
0 0 20 IL (mA) 120
Fig.1--2 IL--VL Characteristics
As shown in Fig.1--2, the resistance of R34 determines the gradient of the IL--VL characteristics. R34 also affects the gain of the line output. Also see 1--2, Setting the AC Characteristics.
8
ICs for Telephone
2. Setting the degree of shifting of the IL--VL characteristics
12
AN6175K
VL (V)
R33=1.3k R33=820(standard) R33=330
0 0 20 IL (mA) 120
Fig.1--3 IL--VL Characteristics Referring to Figs.1--1 and 1--3, the resistance of R33 is now set to 820(standard). * If R33's resistance is decreased, the curve shifts downward. * If R33's resistance is increased, the curve shifts upward. As shown in Fig.1--3, the resistance of R33 determines the degree of vertical shifting of the IL--VL characteristics. R33 also affects the AC characteristics of the line interface.
VCC2 37 R33 TRB 38 MIC amp. TRE 39 Q3
VCC1 C38
Referring to Fig.1--4, the AC impedance(ZAC)of the line interface is calculated as follows : ZAC= R33/ZQ3 If the impedance of transistor Q3 is 2 k(ZQ3=2 k), and the resistance of R33 is 820, then ZAC is determined as follows : ZAC= 820//2k = 600
VL
VCC1 R34
AN6175K Fig.1--4 Line Output 1--2 Setting the AC Characteristics 1. Line output gain adjustment
VCC1 C38 R33 TRB 38 MIC amp. TRE 39 R34 VCC1 Q3 ZL=300 VL
VCC2 37
Use R34 to adjust the line output gain as shown in Fig.1--1. The line output amplifier gain, G(38), as seen from Pin38, is calculated as follows : G(38)= 20 log (ZL/R34) If R34 is 27, G(38) is 21dB.
AN6175K Fig.1--5 Line Output Block Diagram
9
AN6175K
2.
ICs for Telephone
Automatic PAD control adjustment Automatic PAD control, or APC, is such a function as to automatically adjust transmission gain according to line current (IL). The gain range of the APC of the AN6175K is 6 dB. The adjustment of the APC means setting the IL at which the APC starts functioning. The adjustment is done by changing the R24/R25 ratio as shown in Fig.2--1. Under the standard condition(R24=18 k, R25=12 k), the IL at which the APC starts functioning(the APC start point)is 45 mA as shown in Fig.2--2.
DG (dB)
Standard R24/R25 ratio Larger R24/R25 ratio Smaller R24/R25 ratio
Referring to Fig. 1--6, the APC start point depends on the R24/R25 ratio as follows : * If the ratio increases, the point becomes higher. * If the ratio decreases, the point becomes lower.
0
20
45 Line Current IL (mA)
120
Fig.1--6 Automatic PAD Control 3. Balance network adjustment The balance network of the AN6175K application board is shown below. Its constants can be adjusted to application needs.
From line R1 3.9k R3 3.3k C3 0.039F R2 12k
VL pin connecting to the transmission transistor
To the receiver preamplifier R4 330 From the emitter of the transmission transistor
Fig.1--7 Balance Network
(2) Handset(HS)Mode
2--1 Setting the Transmitter System The block diagram of the transmitter system in the HS mode is shown below.
Vr
AN6175K
TRE
+ -
VL ZL=300 Q3 R34 VCC1
38 TAPC
MAI
3 R12 R13
4
MAO
18
APC
C42
R14 C45 C6
R25
R24
VCC1 ECM
Fig.2--1 HS Mode Transmitter System Block Diagram As seen from the above diagram, the gain of the transmitter system from ECM to VL in the HS mode is determined by the gain of the MIC preamplifier and the gain of the line output amplifier(21dB). How to adjust the gain/frequency characteristics of the MIC preamplifier is described below.
10
ICs for Telephone
MIC Preamplifier Gain/Frequency Characteristics Adjustment
AN6175K
The external components, R12, R13, C6, and C45, determine the MIC preamplifier gain/frequency characteristics in the HS mode as shown in Fig. 2--2. R12 and C6 form a low-pass filter, and R13 and C45 form a high-pass filter.
AN6175K
Vr To APC
+ -
Referring to Fig.2--2, the MIC preamplifier gain, G(HSMIC), is calculated as follows : {1/ (2 f C6)}// R12 {1/ (2 f C45)} + R13
MAI VCC1
3 R12 R13
4
MAO
G (HSMIC) = 20log
(dB)
R14 C45 C6
In the standard condition, R12=R13=10 k, C6=102 pF, and C45 = 0.1F.
ECM
Fig.2--2 MIC Preamplifier
The HS mode transmitter frequency characteristics are calculated as follows : * High-band cutoff frequency, fHC=1/(2C6 * R12) * Low-band cutoff frequency, fLC=1/(2C45 * R13) Referring to the above calculations : * For the low-pass filter, the larger the C6 capacitance, the lower the cutoff frequency, or the smaller the capacitance, the higher the frequency. * For the high-pass filter, the larger the C45 capacitance, the lower the cutoff frequency, or the smaller the capacitance, the higher the frequency. See Fig.2--3.
Gain (dB)
Larger C45 Standard C45
Smaller C45 Larger C6
Smaller C6 Standard C6
300
1k
4k
Input Frequency (Hz)
Fig.2--3 HS Mode Transmitter Frequency Characteristics
11
AN6175K
2-2 Setting the Receiver System The block diagram of the receiver system in the HS mode is shown below.
To LOG4amp. BN C32 Vr C31 R32 30 RPI 29 RPO 20 APC 22 DO 21 DI R31 R24 VCC1 C20 R25 C22 R26 R27 C21 Handset receiver
ICs for Telephone
Receiver amplifier RAPC Receiver preamplifier
- +
AN6175K Fig.2-4 HS Mode Receiver System Block Diagram There are two adjustments for the HS mode receiver system as follows : 1. Set the frequency characteristics of the receiver preamplifier. 2. Adjust the receiver amplifier.
1. Receiver Preamplifier Frequency Characteristics Setting Fig.2-5 is the block diagram for the receiver preamplifier.
To LOG4amp. BN C32 Vr C31 Gain (dB) R32 30 RPI 29 RPO 20 R31 0 -3
Receiver preamplifier To receiver amplifier
FN Frequency (Hz)
AN6175K Fig.2-5 Receiver Preamplifier Block Diagram
Fig.2-6 HPF Frequency Characteristics
A high-pass filter(HPF)consisting of R31, R32, C31, and C32 blocks external hum noise. The frequency characteristics of the HPF are calculated as follows(see Fig. 2-6) : 1 2 1 1 x C31 C32 R31 R32
FN =
In the standard condition, R31=56 k, R32=220 k, and C31=C32= 0.0047F.
12
ICs for Telephone
2. Receiver Amplifier Gain Adjustment Use R26, R27, and C21 to adjust the receiver amplifier gain as shown in Fig.2-7.
AN6175K
Handset receiver
Referring to Fig.2-7, the receiver amplifier gain, G(REC), is calculated as follows : G(REC) = 20log R27 R26 + {1/(2 f C21)}
C22
R27 22 21
R26 C21
(dB)
DO
DI
Receiver amplifier
In the standard condition, R26=1 k, R27=100 k, and C21=10F.
AN6175K Fig.2-7 Receiver Amplifier (3) Hands-Free (HF) Mode 3-1 Setting the Transmitter System The block diagram of the transmitter system in the HF mode is shown below.
Vr
AN6175K
VL TATT
+ -
TRB 38 TAPC Q3 R34=27
ZL=300
MAI VCC1
2 R9 R10 C5
MAO
1
TAO
18
36
HFI
20
VCC1 VCC1 R24 C42
R11
C37
C44
C22
R25
ECM
Fig.3-1 HF Mode Transmitter System Block Diagram As seen from the above diagram, the gain of the transmitter system from ECM to VL in the HF mode is determined by the gains of the MIC preamplifier, transmitter attenuator(T ATT), and line output amplifier. The gain of the T ATT is 0 dB, and the gain of the line output amplifier is 21 dB(see 1-2, Setting the AC Characteristics). How to adjust the gain of the MIC preamplifier is the same as that in the HS mode. The gain, G(HSMIC), is calculated as follows : {1/(2f C5)}// R9 {1/(2f C44)} + R10
G (HSMIC) = 20log
(dB)
In the standard condition, R9=26 k, R10=10 k, C5=102 pF, and C44=0.1 F.
13
AN6175K
3-2 Setting the Receiver System The block diagram of the receiver system in the HF mode is shown below.
ICs for Telephone
Loudspeaker To LOG4amp. BN C32 Vr C31 R32 30 RPI 29 RPO 19 27 R31 R31 C28 SPI 26 R28 FB C26 25 SPO1 24 SPO2 Vr
+ -
C27 C29 R29 C24
C25
C23
SP Pre. RATT 2k Vr
-
20k
AN6175K Fig.3-2 HF Mode Receiver System Block Diagram There are two settings for the HF mode receiver system as follows : Set the gain of the receiver preamplifier. Set the gain of the loudspeaker amplifier. Setting of the receiver preamplifier gain is the same as that in the HS mode. How to set the loudspeaker amplifier gain is described below. The loudspeaker amplifier gain, G(SP), is calculated as follows : R28// {1/(2f C26)} +6 R29+ {1/(2f C27)} (dB) Note : 6 dB is added for the purpose of BTL configuration.
G(SP)=20log
In the standard condition, R28=R29=20 k, C26=100 pF, and C27=47F. (4) MF Mode 4-1 Setting the MF Signal Gain Fig. 4-1 shows how the MF signal flows.
VL
AN6175K
TRE 38 TAPC Q3 R34
35
18
APC
C42 MFI C35 R25 R24
VCC1
Fig.4-1 MF Signal Flow In the standard condition, the MF signal gain, G(MF), is equal to the line output gain, that is, 21 dB. To adjust the MF signal gain, use a proper resistor combination as indicated in a dotted box in Fig. 4-1.
14
+
+
-
ZL=600
VCC1
ICs for Telephone
s Detailed Pin Descriptions
Pin No. Symbol Description
AN6175K
Equivalent circuit
[MIC preamplifier output in the HF mode] Amplified HF mode transmitter signals are output from this pin through C7(0.1 F)and R15(5.1 k)to pin 7 to become the LOG amp.1 input. The output impedance, Zout=50.
HF mode MIC + preamplifier
-
VCC1 To the transmitter attenuator 40 1 40
1
MAO(HF)
[MIC preamplifier input in the HF mode] HF mode transmitter signals are input from ECM. Use R9 and R10 to adjust the transmitter signal gain, and use C3 and C44 to adjust the frequency characteristics.
2 - +
2
MAI(HF)
[MIC preamplifier input in the HS mode] HS mode transmitter signals are input from the handset MIC. Use R12 and R13 to adjust the transmitter signal gain, and use C6 and C45 to adjust the frequency characteristics.
3 - +
3
MAI(HS)
[MIC preamplifier output in the HS mode] Amplified HS mode transmitter signals are output from this pin. The output impedance, Zout = 1 k.
VCC1 To the line driver HS mode MIC preamplifier
+
4
MAO(HS)
-
4
[Noise detecting circuit control]
VCC1
5
TND
Turns ON or OFF the background-noise detecting circuit in the HS mode. The circuit turns ON if this pin is grounded through C7(SW7 to a), and turns OFF if this pin is grounded directly(SW7 to b).
5
15
AN6175K
s Detailed Pin Descriptions(cont.)
Pin No. Symbol Description [Noise detecting circuit reference] 6 TVR This pin must be grounded through C8 (22F).
ICs for Telephone
Equivalent circuit
+
6
-
[LOG amp.(1)input(from MIC amp. output)] 7 TLI1 This pin connects through C9(0.1 F)and R15(5.1 k)to the MIC amp. output.
+
7
-
[LOG amp.(2)input(from control output)] 8 TLI2
hands-free
8
+ -
This pin connects through C10(0.1 F)and R16(5.1 k)to the HF control output.
9
RLI1
[LOG amp.(4)input(from receiver preamp. output)] This pin connects through C11(0.1 F)and R17(5.1 k)to the receiver preamp. output.
+
9
-
[LOG amp.(3)input(from loudspeaker amp. output)] 10 RLI2 This pin connects through C12(0.1 F)and R18(5.1 k)to the loudspeaker amp. output.
+
10
-
VCC1
11
TLO1
[LOG amp.(1)output] Outputs amplified MIC amp. output. Grounded through C13(2.2 F). The attack recovery time of the attenuator changes with the capacitance of C13.
11
16
ICs for Telephone
s Detailed Pin Descriptions(cont.)
Pin No. Symbol Description
AN6175K
Equivalent circuit
[LOG amp.(2)output] 12 TLO2 Outputs the amplified hands-free control output. Grounded through C14(2.2 F). The attack recovery time of the attenuator changes with the capacitance of C14.
VCC1
12
VCC1
[LOG amp.(3)output] 13 RLO1 Outputs the amplified receiver preamp. output. Grounded through C15(2.2 F). The attack recovery time of the attenuator changes with the capacitance of C15.
13
[LOG amp.(4)output] 14 RLO2 Outputs the amplified loudspeaker amp. output. Grounded through C16(2.2 F). The attack recovery time of the attenuator changes with the capacitance of C16.
VCC1
14
[Receiver switching] Determines whether the attenuator is to be in the receiver mode or normal mode. If this pin is connected to VCC1(SW3 to b), the receiver mode is selected. If connected to GND(SW3 to a), the normal mode is selected.
15 100k
15
REC-CONT
100k
16
RVR
[Receiver att. gain control] An external rheostat circuit connects to this pin to control the receiver attenuator gain.
16
[Receiver att. switching control] 17 ATC R22(51 k)and C18(4.7 F)connect to this pin to adjust the attenuator switching time.
+ -
17
17
AN6175K
s Detailed Pin Descriptions(cont.)
Pin No. Symbol Description
ICs for Telephone
Equivalent circuit
[Transmitter mode)] 18 TAO
att.
output(hands-free
18
The transmitter attenuator outputs transmitter signals in the HF mode from this pin to Pin36 through C37(0.1 F). The output impedance, Zout=1 k.
[Receiver att. output(hands-free mode)] The receiver attenuator outputs receiver signals in the HF mode from this pin through C29(0.1 F)and R30(10 k)to Pin27 as the loudspeaker preamplifier non-inverse input. The output impedance, Zout=1 k.
19
RAO
19
[Auto. PAD current control(handset mode, MF)] 20 APC The ratio of R24 to R25 as connected to this pin controls the operation point of the automatic PAD.
APC 20 1.2V VGR 40 BGR
21
DI
[Receiver amp. input(-)] Combined R26, R27, and C21 as connected to this pin determine the gain of the receiver amplifier.
21
[Receiver amp. output] 22 DO Connects through C22(22F)to the handset receiver. The output impedance, Zout=100 .
22
23
GND
[Ground] This is the ground pin of the IC.
18
ICs for Telephone
s Detailed Pin Descriptions(cont.)
Pin No. Symbol Description
AN6175K
Equivalent circuit
[Loudspeaker amp.(2)output] Pins24 and 25 form a BTL configuration. The output impedance, Zout=10 . 24 SPO2 [Loudspeaker amp.(1)output] Pins24 and 25 form a BTL configuration. Connects through R18 and C12 to pin 10 as the LOG amp.(3)input. The output impedance, Zout=10 .
26
+ -
25
24 VCC1
+ -
25
SPO1
[Loudspeaker amp. input(-)] Combined R28, R29, C26, and C27 connect to this pin to adjust the gain and the frequency characteristics of the loudspeaker amplifier. The loudspeaker amplifier is added with another gain of 6 dB because of its BTL configuration.
26
26
FB
VCC1
[Loudspeaker amp. input(+)]
27
27
SPI
The receiver attenuator output signal is sent from pin 19 to this pin through C28 (coupling capacitor).
+
-
[Loudspeaker amp. power input] 28 VSP The power supply pin for the loudspeaker amplifiers and other output circuits. [Receiver preamp. output] Amplified receiver signals are output from this pin through C30(coupling )to Pin9 as the LOG amp.(4)input. Within the IC, the receiver preamplifier output also connects to the receiver amplifier for the HS mode and to the receiver attenuator for the HF mode.
VCC1 To rec. amp. for HS mode Rec. preamp. 40 29
- +
29
RPO
40 To rec. att. for HF mode
[Receiver preamp. input] 30 RPI Receiver signals are input from line to this pin through a high-pass filter consisting of R31, C31, and C32. The filter removes hum from receiver signals.
30
19
AN6175K
s Detailed Pin Descriptions(cont.)
Pin No. Symbol Description [Mode switching(handset or hands-free /MF)] 31 HS, HF/MF This pin must be connected to VCC1 for the HS or HF mode(SW2 to a), or to GND for the MF mode (SW2 to b).
31
ICs for Telephone
Equivalent circuit
50k
100k
[Mode switching(handset/hands-free)] 32 HS/HF This pin must be connected to VCC1 for the HS mode (SW1 to a), or to GND for the HF mode (SW1 to b).
32 50k
100k
VCC1
[Reference for the handset or hands-free mode] 33 Vr The voltage equal to half the VCC1 voltage is output.
+
33
-
34
ST
[Input to the base of the power supply transistor] This pin connects to the base of Q4.
34
[MF input] 35 MFI MF signals are input to this pin through C35(0.1F). The input impedance, Zin=20 k.
35
20k
[From transmitter att. output(hands-free mode)] 36 HF1 The transmitter attenuator output is sent from Pin18 to this pin through C37(0.1 F). The input impedance, Zin=20 k.
VCC1
+
36
-
37
VCC2
[Transmission amp. AC impedance setting] This pin connects to VCC1 through C38 (100F)and to the collector of Q3 (transmission transistor)through R38(330 ).
20
ICs for Telephone
s Detailed Pin Descriptions(cont.)
Pin No. Symbol Description
AN6175K
Equivalent circuit
[To the base of the transmission transistor] 38 TRB This pin connects to the base of Q3 (transmission transistor).
38
[To the emitter of the transmission transistor] 39 TRE This pin connects to the emitter of Q3 (transmission transistor)and R33 to adjust the Q3 gain.
39
+
[Band-gap ref. voltage output] 40 BGR Connects to GND through C39(47 F).
BGR
40
-
BGR
[Power output to the handset and handsfree circuits] 41 VCC1 The power supply pin for the signal processing circuits.
+
[Hands-free control output] 42 SOUT Outputs transmitter monitor signals in the HF mode. Connects through R16 and C10 to LOG amp.(2)input at Pin8.
42 SOUT
-
21

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