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SPEECH NETWORK WITH DIALER INTERFACE S1T8501
INTRODUCTION
16−DIP−300A
The S1T8501 is a speech network integrated circuit which includes
the following components: transmit amp, receive amp, DTMF amp,
voltage regulator, line equalizer, and voltage comparator. It handles
the voice signal, performing the 2/4 wires interface and changing the
gain on both sending and receiving amplifiers to compensate the line
current. The S1T8501 can work in fixed gain mode.
FEATURES
• Adjusts sending and receiving attenuation length
• Regulated voltage output for external dialer
• Linear interface for DTMF
• Suitable for ceramic transducers
• Mute function
ORDERING INFORMATION
Device Package Operating Temperature
S1T8501X01-D0B0 16−DIP−300A −45°C — + 70°C
1
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S1T85011 SPEECH NETWORK WITH DIALER INTERFACE
PIN CONFIGURATION
REGULATOR
REGULATOR
LINE CURRENT
Z
BAL
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Value Unit
MIC1
V +
MUTING
BIAS ADJ.
BYPASS
SENSING
SWITCH
1
2
3
4
5
6
7
8
S1T8501
16
15
14
13
12
11
10
9
MIC2
V
DD
MF
RXO2
RXO1
RXI +
RXI −
V −
Line Voltage (3msec max)
Forward Line Current
Reverse Line Current
Power Dissipation (Ta = 70°C)
Operating Temperature
Storage Temperature
T
T
V
L
I
LF
I
LR
P
D
OPR
STG
22 V
150 mA
−150 mA
1 W
− 45 — + 70 °C
− 65 — + 150 °C
2
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SPEECH NETWORK WITH DIALER INTERFACE S1T8501
ELECTRICAL CHARACTERISTICS (TA = 25°C)
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
IL = 12mA 3.9 − 4.7
Line Voltage V
L
Ta = 25°C
VIL = 20mA − − 5.5
IL = 80mA − − 12.2
Common Mode Rejection Ratio CMRR f = 1kHz, IL = 12 to 80mA 50 − − dB
Line Matching Impedance Z
L
VRI = 0.3V, IL = 12 to 80mA f = 1kHz 500 600 700 Ω
Ta = 25°C
IL = 25mA 48 49 50
f = 1kHz
TX Gain G
V (TX)
VMI = 2mV
dBIL = 52mA 44 45 46
IL = 25 to 52mA 48 49 50
TX Gain Flatness ∆ G
TX Distortion THD
TX Noise V
Side Tone G
MIC Input Impedance Z
NO (TX)
V (ST)
I (MIC)
V (TX)
TX
VMI = 2mV, f
f = 1kHz
IL = 16 to
80mA
= 1kHz, IL = 12 to 80mA − − ± 1 dB
ref
VSO = 1V − − 2
VSO = 1.3V − − 10
%
VMI = 0V, IL = 40mA − − −70 dBm
Ta = 25°C, f= 1kHz, IL = 25 to 52mA − − 36 dB
VMI = 2mV, IL = 12 to 80mA 40 − − kΩ
IL = 25mA −30 − −
Tx Loss in MF Operation G
V (LOSS)
VMI =2mV
Ta = 25°C
IL = 52mA −30 − −
dB
IL = 25mA 7 8 9
VRI = 0.3V
RX Gain G
V (RX)
f = 1kHz
dBIL = 52mA 2.5 3.5 4.5
IL = 25 to 52mA 7 8 9
RX Gain Flatness ∆G
V (RX)
VRI = 0.3V, f
RX Distortion THDRX f =1kHz
RX Noise V
RX Output Impedance R
MF Supply Voltage V
Standby I
MF Supply Current
Operation I
MF Amplifier Gain G
DC Input Voltage Level (pin 14) V
Input Impedance (pin 14) Z
NO (RX)
O (RX)
DD (MF)
SB (MF)
DD (MF)
V (MF)
I (MF)
I (MF)
Distortion THD
MF
VRI = 0V, IL = 12 to 80mA − − 100 µV
VRO = 50mV, IL = 40mA − − 100 Ω
IL = 12 to 80mA 2.4 2.5 − V
IL = 12 to 80mA
IL = 12 to 80mA fMF = 1kHz,VMF = 80mV 15 − 17 dB
VMF = 80mV − 0.3V
VMF = 80mV 40 − − kΩ
VMF = 110mV, IL = 12 to 80mA − − 2 %
= 1kHz, IL = 12 to 80mA − − ± 1 dB
ref
VRO = 1.6V − − 2
IL = 12mA
VRO = 1.9V − − 10
VRO = 1.8V − − 2
IL = 50mA
VRO = 2.1V − − 10
0.5 − −
2 − −
− V
DD
%
mA
3
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S1T85011 SPEECH NETWORK WITH DIALER INTERFACE
ELECTRICAL CHARACTERISTICS (TA = 25°C) (Continued)
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
Starting Delay Time t
Muting Threshold Voltage (pin 3) V
Standby I
Muting Current
Operation I
D (ST)
TH(MUTE)
SB (MUTE)
DD (MUTE)IL
IL = 12 to 80mA − − 5 mS
− − 1
V
1.6 − −
IL = 12 to 80mA − − − 10
µA
= 12 to 80mA − − + 10
4
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SPEECH NETWORK WITH DIALER INTERFACE S1T8501
APPLICATION CIRCUIT
68
1uF
330
1K
5K
7.5K
13K
10
8
4
9
10uF
AGC
567
11
Rx Amp
Reg.
30
to Dialer
2
Io
Output
Amp
Tx Amp
3
MUTE MF Signal
1415
Mic Amp
MF Amp
12
13
1
16
3.6K
1.8K
1.8K
SPEAKER
15V
MIC
+
Tip
_
Ring
5
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S1T85011 SPEECH NETWORK WITH DIALER INTERFACE
NOTES
6
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