COMPANDER S1T8507C INTRODUCTION 20−DIP−300A S1T8507C is a automatic gain control system that is used for dynamic range compression and expansion. By companding the signal , this can reduce the noise components. S1T8507C includes compressor, expander, pre-amp, filter amp, limiter and mute/bypath logic. FEATURES 20−SOP−375 • Wide Supply Voltage ( 2.4 to 7V ) • Easy Gain Control • Mute/Bypath Logic • Data In/Out Pin ORDERING INFORMATION Device Package S1T8507C01-D0B0 20−DIP−300A S1T8507C01-S0B0 20−SOP−375 Operating Temperature −20°C to +70°C 1 S1T8507C COMPANDER BLOCK DIAGRAM AGIC CRC DI CO FI 5 6 4 3 2 Filter Amp Rectifier Compressor Output Buffer Bypath + Variable Resistor 1 Fo 11 CMUTE 12 BYPATH 13 EMUTE 20 Vcc Compressor Mute 5.1K 3.3K CPI- 7 Summing Amp CPI+ 8 Limiter + Logic CB Bypath EPI- 16 EPI+ 15 Variable Resistor Summing Amp Rectifier Expandor Mute + Bias Circuit 17 18 19 9 14 10 DO ERC EO CB EB GND PIN CONFIGURATION FO 1 20 Vcc FI 2 19 EO CO 3 18 ERC DI 4 17 DO AGIC 5 16 EPI- CRC 6 15 EPI+ CPI- 7 14 EB CPI+ 8 13 EMUTE CB 9 12 BYPATH 10 11 CMUTE GND 2 KA8507 S1T8507C COMPANDER S1T8507C PIN DESCRIPTION Pin No Symbol 1 FO 2 FI 3 Description Pin No Symbol Description Filter Amp Output 11 CMUTE Compressor Mute Filter Amp Input 12 BYPATH No companding CO Compressor Output 13 EMUTE Expander Mute 4 DI Data Input 14 EB 5 AGIC AC Gain Infinity Capacitor 15 EPI + Expander Non-Inverting Input 6 CRC Compressor Rectifier Capacitor 16 EPI − Expander Inverting Input 7 CPI − Compressor Inverting Input 17 DO 8 CPI + Compressor Non-Inverting Input 18 ERC 9 CB Compressor Reference Bias 19 EO Expander Output 10 GND Ground 20 VCC Supply Voltage Expander Reference Bias Data Output Expander Rectifier Capacitor ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Power Dissipation S1T8507C01-D0B0 S1T8507C01-S0B0 Symbol Value Unit VCC 10 V 1000 mW PD 410 Operating Temperature TOPR − 20 to + 70 °C Storage Temperature TSTG − 55 to + 150 °C 3 S1T8507C COMPANDER ELECTRICAL CHARACTERISTICS (VCC = 3V, f = 1kHz, Ta = 25°C, unless otherwise noted) Characteristic Symbol Test Condition Min. Typ. Max. Unit − − 2.4 7.0 V − 4.0 6.5 mA DC ELECTRICAL CHARACTERISTICS Operating Voltage VCC Operating Current ICC No Signal Standard Input Voltage (0dB) VI (COMP) VCC = 300mVrms = 0dB 8.0 12.5 17.0 mVrms Gain Difference ∆GV1 (COMP) Vin = −20dB −0.5 0 +0.5 dB ∆GV2 (COMP) Vin = −40dB −1.0 0 +1.0 Bypath Gain Difference ∆GVB (COMP) Vin = 0dB, BYPATH = GND −1.5 0 +1.5 dB Output Distortion THD COMP Vin = 0dB − 0.5 1.0 % Noise Output Voltage VNO (COMP) Rg = 620ohm − 3.0 5.5 mVrms Mute Attenuation Ratio ATT MUTE Vin = 0dB, CMUTE = GND 60 80 − dB Limiting Voltage VLIM (COMP) 1.15 1.35 1.50 Vp-p mVrms COMPRESSOR PART − EXPANDER PART Standard Output Level (0dB) VO (EXP) Vin = 30mVrms = 0dB 110 130 160 ∆GV1 (EXP) Vin = −10dB-0.5 −0.5 0 +0.5 ∆GV2 (EXP) Vin = −20dB −1.0 0 +1.0 ∆GV3 (EXP) Vin = −30dB −1.5 0 +2.0 Bypath Gain Difference ∆GVB (EXP) Vin = 0dB, BYPATH = GND −2.5 0 +0.5 dB Output Distortion THD EXP Vin = 0dB − 0.5 1.5 % Noise Output Voltage VNO (EXP) Rg = 620ohm − 10.0 30.0 µVrms Mute Attenuation Ratio ATT MUTE Vin = 0dB, EMUTE = GND 60 80 − dB Max. Output Voltage VOEXP (MAX) THD = 10% 700 800 − mVrms Gain Difference 4 dB COMPANDER S1T8507C TEST CIRCUIT 1µ F 1 + FO Vcc 20 + COMP OUT Vcc 10uF 10K 100K 2 FI EO 19 EXP OUT + 1.0uF 10K 1 µF + CO ERC 18 + 3 2.2uF DI DO KA8507 S1T8507C 22uF + 5 AGIC 17 50pF 51K EPI- 16 + 4 10K + 1.0uF 474 2.2uF 6 CRC EPI+ 15 620 EXP IN 100K 7 CPI- EB 14 + + 9.1K 4.7uF 0.47uF 474 8 CPI+ 9 CB 10 GND EMUTE 13 BYPATH 12 CMUTE 11 620 + COMP IN SW3 SW2 4.7uF SW1 5 Vcc + 47µF Speaker 33K TO TX Modulation 104 20 1 + 101 Filter Amp 5.6K 132 19 2 390K 473 Exp 120K 18 3 + - + 4 17 2.2µF 39K Data output 473 10K + 22µF 0.47µF 16 5 + Comp + - 33K 33K 473 15 6 47K 7 + + 8 13 10µF 1 µF 3.3K REG 14 Expander input 104 - + 22 µF 2.2µF 51K + 8.2K 9 2.2K REG LOGIC 12 Expander Mute 223 103 11 10 MIC Compressor Mute 6 COMPANDER S1T8507C APPLICATION CIRCUIT (HAND SET)