SPEECH NETWORK WITH DIALER INTERFACE
S1T2425A
INTRODUCTION
18−DIP−300A
The S1T2425A is telephone speech network integrated circuit which
includes transmit amp, receive amp, side tone amp, DC loop interface
function, DTMF input, voltage regulator for speech, a regulated output
voltage for a dialer, and equalization circuit .
FEATURES
•
Low voltage operation (1.5V : speech)
•
Transmit, Receive, Side tone and DTMF level
are controlled by external resistors
•
Regulated voltage for dialer
•
Loop length equalization
•
MUTE function
•
Linear interface for DTMF
ORDERING INFORMATION
Device
Package
Operating Temperature
S1T2425A01-D0B0
18−DIP−300A
− 20 to + 60°C
PIN CONFIGURATION
MIC
1
18
MT
TXI
2
17
MS
TXO
3
16
TI
STA
4
15
VDD
CC
5
14
V+
EQ
6
13
LR
RXI
7
12
LC
RXO
8
11
VR
RMT
9
10
V-
S1T2425A
1
S1T2425A
SPEECH NETWORK WITH DIALER INTERFACE
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Value
Unit
V+ Voltage
VC
−1.0 to +18
V
VDD (V+ = 0)
VDD
−1.0 to +6
V
MT,MS inputs
VM
−1.0 to VDD +1
V
VLR
VLR
−1.0V to V+ -3.0
V
Storage Temperature
TSTG
−65 to +150
°C
RECOMMENDED OPERATING CONDITIONS (TA = 25°C)
Characteristic
Symbol
Value
Unit
0 to 10
mA
ITXO (Instantaneous)
ICC
V+ (Voltage :Speech Mode
V+ (SM)
+1.5 to +15
V
Tone Dialing Mode
V+(TM)
+3.3 to +15
V
Operating Temperature
TORR
−20 to +60
°C
ELECTRICAL CHARACTERISTICS (Ta = 25°C)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
SYSTEM SPECTIFICATIONS (Refer to Fig.3 and Fig.4)
TX Gain from VS to V+
Gain Change
Distortion
Output Noise
GV (TX)
∆GV (TX)
THD TX
VNO (TX)
Figure (IL = 20mA)
IL = 60mA
28
−6.0
−
−
29.5
−4.5
2.0
11
31
−3.6
−
−
dB
dB
%
dBmc
RX
VRXO / VS
RX Gain Change
Distortion
GV (RX)
∆GV (RX)
THD RX
f = 1.0kHZ, IL = 20mA
(See Figure.4)
IL = 60mA
−16
−5.0
−
−15
−3.0
2.0
−13
−2.0
−
dB
dB
%
DTMF Driver V+ / VIN
GV (MF)
IL = 20mA
3.2
4.8
6.2
dB
Sidetone Level VRXO / V+
GV (ST)
IL = 20mA
IL = 60mA
−
−
−28
−13
−
−
dB
RST
IL = 20mA
12
18
−
dB
Sidetone rejection
{ VRXO (figure 4)} dB
V+
VRXO
−{
(figure 3)}dB
V+
2
SPEECH NETWORK WITH DIALER INTERFACE
S1T2425A
ELECTRICAL CHARACTERISTICS (Ta = 25°C) (Continued)
Characteristic
Tip-Ring Voltage
(including polarity guard bridge
drop of 1.4V)
(Speech Mode)
AC impedance
Speech mode (incl. C6,see fig.
4)
Zac = (600)V +/ (VS - V+)
Tone Mode (including C6)
Symbol
VTR
Zac
Test Conditions
Min.
Typ.
Max.
Unit
IL = 5.0mA
IL = 10mA
IL = 20mA
IL = 40mA
IL = 60mA
−
−
−
−
−
2.4
3.9
4.6
5.6
6.6
−
−
−
−
−
VDC
IL = 20mA
IL = 60mA
20mA < IL , 60mA
−
−
−
750
300
1650
−
−
−
W
SYSTEM AMPLIFIERS
TX Gain
TXO Bias Voltage
TXO Bias Voltage
TXO Bias Voltage
TXO Bias Voltage
TXI input Resistance
GV (TX)
VBIAS (SPM)
VBIAS (TM)
VOL (SPM)
VOL (SPM)
RI (TXI)
TXI to TXO
Speech/Pulse Mode
Tone Mode
Speech/Pulse Mode
Speech/Pulse Mode
24
0.45
VR −25
VR −25
−
−
26
0.52
VR −5.0
VR −5.0
125
10
28
0.60
−
−
250
−
dB
xVR
mV
mV
mV
kΩ
RX
RXO Bias voltage
RXO Source current
RXO Source current
RXO High Voltage
RXO Low Voltage
VBIAS (AM)
ISOURCE (SM)
ISOURCE (PTM)
VOH (AM)
VOL (AM)
All Mode
Speech Mode
Pulse/tone Mode
All Mode
All Mode
0.45
1.5
200
VR −100
−
0.52
2.0
400
VR −50
50
0.60
−
−
−
150
xVR
mA
µA
mV
mV
Gv(STA)
@VLR = 0.5V
@VLR = 2.5V
@VLR = 0.2V
@VLR = 1.0V
−
−
−
−
−15
−21
−15
−21
−
−
−
−
0.65
0.8
0.9
xVR
SIDETONE AMPLIFIER
Gain (TXO to STA)
Speech Mode
Speech Mode
Pulse Mode
Pulse Mode
STA Bias Voltage
VBIAS (STA)
All Modes
dB
MICROPHONE, RECEIVER CONTROLS
MIC Saturation Voltage
VSAT (MIC)
Speech Mode,1 = 500µA
−
50
125
mV
MIC Leakage Current
ILKG (MIC)
Dialing Mode,Pin 1=3.0V
−
0
5.0
µA
MAT Resistance
RRMT (SM)
RRMT (DM)
Speech Mode
Dialing Mode
−
5.0
8.0
10
15
18
Ω
kΩ
RMT Delay
tD (RMT)
Dialing to Speech
2.0
4.0
20
ms
−
−
−
−
−12
−2.5
−12
−2.5
−
−
−
−
EQUALIZATION AMPLIFIER
GAIN (V + to EQ)
Speech Mode
Speech Mode
Pulse Mode
Pulse Mode
GV (EQ)
@ VLR = 0.5V
@ VLR = 2.5V
@ VLR = 0.2V
@ VLR = 1.0V
dB
3
S1T2425A
SPEECH NETWORK WITH DIALER INTERFACE
ELECTRICAL CHARACTERISTICS (Ta = 25°C) (Continued)
Characteristic
EQ Bias Voltage
Speech Mode
Pulse Mode
Speech, Pulse Mode
Symbol
VBIAS (EQ)
Test Conditions
Min.
Typ.
Max.
Unit
@ VLR = 0.5V
@ VLR = 0.5V
@ VLR = 2.5V
−
−
−
0.66
1.3
3.3
−
−
−
Vdc
DIALING INTERFACE
MT Input Resistance
R1 (MT)
−
50
100
−
kΩ
MT Input High Voltage
VIH (MT)
−
VDD-0.3
−
−
Vdc
MT Input Low Voltage
VIL (MT)
−
-
−
1.0
Vdc
MS Input Resistance
RI (MS)
−
280
600
−
kΩ
MS Input High Voltage
VIH (MS)
−
2.0
−
−
Vdc
MS Input Low Voltage
TI Input Resistance
VIL MS)
RI (T1)
−
−
−
−
−
1.25
0.3
−
Vdc
kΩ
DTMF Gain
GV (MF)
−
3.2
4.8
6.2
dB
V+ = 1.7V
V+ = 12V
V+ = 12V
4.5
5.5
6.0
7.1
8.4
8.8
9.0
12.5
14.0
mA
IL = 20mA
IL = 30mA
IL = 120mA
IL = 20mA
IL = 30mA
2.6
3.0
7.0
4.1
4.5
3.2
3.7
8.2
4.9
6.4
3.8
4.4
9.5
5.7
6.2
LINE INTERFACE
V+ Current (Pin 12 Grounded)
Speech Mode
Speech/Pulse Modes
Tone Mode
V+ Voltage
Speech/Pulse Mode
Speech/Pulse Mode
Speech/Pulse Mode
Tone Mode
Tone Mode
1+
V+
Vdc
LR Level Shift
Speech/Pulse Mode
Tone Mode
∆ VLR
V + -VLR
−
−
2.7
4.3
−
−
Vdc
LC Terminal Resistance
RLC
-
36
57
94
KΩ
VR Voltage
Load Regulation
Line Regulation
VR
∆ VO
∆ VO
(V+ = 1.7V)
0mA < IR < 1.6mA
2.0V < V + < 6.5V
1.1
−
−
1.2
20
25
1.3
−
−
Vdc
mV
mV
VDD Voltage
Load Regulation (Dialing Mode)
Line Regulation (All Modes)
Max. Output Current
Max. Output Current
VDD
∆ VO (DM)
∆ VO (AM)
IOSM (MAX)
IODM (MAX)
(V+ = 4.5V)
0 < IDD < 1.6mA
4.0V < V + < 9.0V
Speech Mode
Dialing Mode
3.0
−
−
375
1.6
3.3
0.25
50
550
2.0
3.8
−
−
1000
3.6
Vdd
Vdd
mV
µA
mA
VDD Current Leakage
ILKG (VDD)
V + = 0, VDD = 3.0V
−
−
1.5
µA
VOLTAGE REGULATORS
NOTE: Typicals are tested or guaranteed.
4
SPEECH NETWORK WITH DIALER INTERFACE
S1T2425A
TEST CIRCUIT
V+
14
13
12
+
18
400mVrms
17
47 Ω
V IN
20µF
KA2425A
S1T2425A
16
10
600 Ω
22K
ILOOP
204
1.0V
Figure 1. DTMF Driver Test
150K
V+
503
8.2K
33K
4
7
2
8
3
150Ω
11
12
KA2425A
S1T2425A
10K
6
20mVrms
1KHz
10
14
Vs
15
+
ILOOP
Microphone Equivalent
17
13
47Ω
20µF
600Ω
18
10
204
150Ω 503
203
Figure 2. Transmit and sidetone level test
5
S1T2425A
SPEECH NETWORK WITH DIALER INTERFACE
150K
V+
503
8.2K
33K
4
7
2
8
3
11
12
KA2425A
S1T2425A
6
10
14
15
17
18
10
13
20µF
+
150Ω 503
47Ω
20mVrms
1KHz
203
ILOOP
204
Vs
Figure 3. Impedance, Receive and Sidetone Rejection Test
6
SPEECH NETWORK WITH DIALER INTERFACE
S1T2425A
APPLICATION CIRCUIT
TIP H/S SW
8.2K
-
+
14
RING
103
223
220K
4.7K
6
1
4
2
15
3
102
3.3K
200 Ω
MIC
2.2K
KA2425A
S1T2425A
68 Ω, 1/2
13
7
12
8
11
9
47 µF
33µF
+
+
SPEAKER
393
10
120K
+
102
383
383
22 µF
472
7