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UNIVERSAL SPEECH NETWORK S1T8603
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INTRODUCTION
The S1T8603 can fulfill the standards of other countries by changing
the external component. Dynamic or piezoelectric type can be used
with receiver. Each gain is controlled with AGC in accordance with the
line current. The S1T8603 can be operated down to D.C line 1.6V.
FEATURES
• Independent adjustment of DC resistance and AC impedance.
• ECM or dynamic microphone can be used.
• DTMF signal interface.
• Mute function
• Operates at the low line voltage (1.6V)
• Low or high impedance receiver type can be used.
• Low line current operation. (IL = 4mA)
ORDERING INFORMATION
Device Package Operating Temperature
S1T8603X01-D0B0 16−DIP−300A
− 25°C to +75°C
S1T8603X-S0B0 16−SOP−225
16−DIP−300A
16−SOP−225
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S1T8603 UNIVERSAL SPEECH NETWORK
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BLOCK DIAGRAM
PIN CONFIGURATION
12
5
13
6
7
11
9 8
BIAS &
REFERENCE
RXI
MXI
ATTENU
ATOR
14 15 3
AGC
BAND GAP
REF
4
16
1
2
10
INVERTER
RX AMP
MIC AMP
DTMF AMP
TX AMP
MUTE
RXI
MIC-
MIC+
MF
GND CST VST AGC TXGA2 R
DC
TXGA1
RXO
RXGA
V
L
Vcc
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
KA8603
V
L
TXGA1
TXGA2
RXO
RXGA
MIC-
MIC+
CST
RDC
AGC
VST
Vcc
MUTE
MF
RXI
GND
S1T8603
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UNIVERSAL SPEECH NETWORK S1T8603
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PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
Pin No Symbol Description
1 V
L
Positive power line and TX Amp output
2 TXGA1 TX gain adjustment
3 TXGA2 TX gain adjustment
4 RXO RX output
5 RXGA RX gain adjustment
6 MIC- Mic(-) input
7 MIC+ Mic(+) input
8 CST Current stabilizer
9 GND Ground
10 RXI RX input
11 MF DTMF Input
12 MUTE Mute ‘High’: DTMF mode, Mute ‘Low’: speech mode
13 V
CC
Internal power supply pin
14 VST Voltage stabilizer
15 AGC Automatic gain control
16 R
DC
DC Resistance control
Characteristic Symbol Value Unit
Line Voltage V
L
15 V
Line Current I
L
150 mA
Surge Line Current I
L(SURGE)
200 mA
Power Dissipation P
D
1.0 W
Operating Temperature T
ORP
− 25 — 75 °C
Storage Temperature T
STG
− 55 — 150 °C
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S1T8603 UNIVERSAL SPEECH NETWORK
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ELECTRICAL CHARACTERISTICS
(Ta = 25°C, f = 1kHz, IL = 15mA, unless otherwise noted)
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
Line Voltage V
L
IL = 4mA − 2.1 −
IL = 15mA 3.55 3.9 4.25 V
IL = 50mA 4.1 4.6 5.1
IL = 140mA − 6.45 7.0
Line Voltage with R
UP
V
LU
Between Pin14 & Pin 16
R
up
= 220kΩ
4.15 4.35 4.55 V
Line Voltage with R
DOWN
V
LD
Between Pin 14& Pin 1
R
DOWN
= 330kΩ
3.25 3.45 3.65 V
TX Gain G
V (TX)
RTX = 68kΩ
VI = 3mVrsm
IL = 15mA 49.5 51.5 53.5
IL = 50mA 45.5 47.5 49.5 dB
IL = 80mA 43.5 45.5 47.5
TX Gain frequency response ∆G
TXF
f = 300 to 3400Hz − ± 0.2 − dB
TX Dynamic output voltage V
O(TX)
THD = 2% THD = 10% − 1.6 − Vrms
1.7 2.2 −
MIC Input Impedance Z
I(MIC)
− − 64 − kΩ
RX Gain G
V(RX)
R
LOAD
=
150Ω+10u
IL = 15mA 28.5 30.5 32.5
IL = 50mA 24.5 26.5 28.5 dB
IL = 80mA 22.5 24.5 26.5
RX Gain frequency response ∆G
RXF
f = 300 to 3400Hz − ± 0.2 − dB
RX Dynamic output voltage V
O(RX)
THD = 2% (RL = 150Ω)
THD = 10%
0.22 0.29 − Vrms
0.30 0.40 −
DTMF GAIN G
V (MF)
RTX = 68KΩ (MUTE = H) 23.5 25.5 27.5 dB
DTMF Input Impedance Z
I (MF)
− − 20.7 − kΩ
MUTE Input Voltage V
IH (MUTE)
− 1.5 − V
CC
V
V
IL (MUTE)
− − − 0.8
TX Gain variation range by AGC ∆G
TXA
R
AGC
= 180KΩ IL = 15 ~ 80mA − −6 − dB
RX Gain variation range by AGC ∆G
RXA
R
AGC
= 180KΩ IL = 15 ~ 80mA − −6 − dB
TX Noise Output Voltage
(Psophometric weighted)
V
TNO
− − −72 − dBmp
RX Noise Output Voltage
(Psophometric weighted)
V
RNO
− − 50 − uV
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UNIVERSAL SPEECH NETWORK S1T8603
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APPLICATION CIRCUIT
Figure 1.
1 13
+
10
16
RXI
AMP
4
RXI
AMP
TX
AMP
3 112 12 8 9 15 14
5
+
MIC
AMP
6
7
+
TIP
RING
12V
120K
100nF
620
220µF
3.9K
390
pin 14
Rup
200
Zc Zr
20
500p
68K
3.6K 180K
1µF
Rdown pin1
MIC
RECEIVER
10µF
100K
V
L
V
CC
RXO+ RXGA
RXI
V
DC
TXGA1 TXGA2MUTE
CST
MF
GND AGC VST
MIC+
MIC-
100pF
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S1T8603 UNIVERSAL SPEECH NETWORK
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NOTES
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