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

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