SPEECH NETWORK WITH DIALER INTERFACE
S1T8501
1
INTRODUCTION
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
16
-
DIP
-
300A
SPEECH NETWORK WITH DIALER INTERFACE
S1T8501
3
ELECTRICAL CHARACTERISTICS (TA = 25
C)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Line Voltage
V
L
Ta = 25
C
I
L
= 12mA
3.9
-
4.7
V
I
L
= 20mA
-
-
5.5
I
L
= 80mA
-
-
12.2
Common Mode Rejection Ratio
CMRR
f = 1kHz, I
L
= 12 to 80mA
50
-
-
dB
Line Matching Impedance
Z
L
V
RI
= 0.3V, I
L
= 12 to 80mA f = 1kHz
500
600
700
TX Gain
G
V (TX)
Ta = 25
C
f = 1kHz
VMI = 2mV
I
L
= 25mA
48
49
50
dB
I
L
= 52mA
44
45
46
I
L
= 25 to 52mA
48
49
50
TX Gain Flatness
G
V (TX)
V
MI
= 2mV, f
ref
= 1kHz, I
L
= 12 to 80mA
-
-
1
dB
TX Distortion
THD
TX
f = 1kHz
I
L
= 16 to
80mA
V
SO
= 1V
-
-
2
%
V
SO
= 1.3V
-
-
10
TX Noise
V
NO (TX)
V
MI
= 0V, I
L
= 40mA
-
-
-
70
dBm
Side Tone
G
V (ST)
Ta = 25
C, f= 1kHz, I
L
= 25 to 52mA
-
-
36
dB
MIC Input Impedance
Z
I (MIC)
V
MI
= 2mV, I
L
= 12 to 80mA
40
-
-
k
Tx Loss in MF Operation
G
V (LOSS)
V
MI
=2mV
I
L
= 25mA
-
30
-
-
dB
I
L
= 52mA
-
30
-
-
RX Gain
G
V (RX)
Ta = 25
C
V
RI
= 0.3V
f = 1kHz
I
L
= 25mA
7
8
9
dB
I
L
= 52mA
2.5
3.5
4.5
I
L
= 25 to 52mA
7
8
9
RX Gain Flatness
G
V (RX)
V
RI
= 0.3V, f
ref
= 1kHz, I
L
= 12 to 80mA
-
-
1
dB
RX Distortion
THDRX
f =1kHz
I
L
= 12mA
V
RO
= 1.6V
-
-
2
%
V
RO
= 1.9V
-
-
10
I
L
= 50mA
V
RO
= 1.8V
-
-
2
V
RO
= 2.1V
-
-
10
RX Noise
V
NO (RX)
V
RI
= 0V, I
L
= 12 to 80mA
-
-
100
V
RX Output Impedance
R
O (RX)
V
RO
= 50mV, I
L
= 40mA
-
-
100
MF Supply Voltage
V
DD (MF)
I
L
= 12 to 80mA
2.4
2.5
-
V
MF Supply Current
Standby
I
SB (MF)
I
L
= 12 to 80mA
0.5
-
-
mA
Operation
I
DD (MF)
2
-
-
MF Amplifier Gain
G
V (MF)
I
L
= 12 to 80mA f
MF
= 1kHz,V
MF
= 80mV
15
-
17
dB
DC Input Voltage Level (pin 14)
V
I (MF)
V
MF
= 80mV
-
0.3V
DD
-
V
Input Impedance (pin 14)
Z
I (MF)
V
MF
= 80mV
40
-
-
k
Distortion
THD
MF
V
MF
= 110mV, I
L
= 12 to 80mA
-
-
2
%
S1T85011
SPEECH NETWORK WITH DIALER INTERFACE
4
Starting Delay Time
t
D (ST)
I
L
= 12 to 80mA
-
-
5
mS
Muting Threshold Voltage (pin 3)
V
TH(MUTE)
-
-
1
V
1.6
-
-
Muting Current
Standby
I
SB (MUTE)
I
L
= 12 to 80mA
-
-
-
10
A
Operation
I
DD (MUTE)
I
L
= 12 to 80mA
-
-
+ 10
ELECTRICAL CHARACTERISTICS (TA = 25
C) (Continued)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
PDF 
ZIP
