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| 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 * * * * Wide Supply Voltage ( 2.4 to 7V ) Easy Gain Control Mute/Bypath Logic Data In/Out Pin 20-SOP-375 ORDERING INFORMATION Device S1T8507C01-D0B0 S1T8507C01-S0B0 Package 20-DIP-300A 20-SOP-375 Operating Temperature -20C to +70C 1 S1T8507C COMPANDER BLOCK DIAGRAM AGIC 5 CRC 6 Rectifier Bypath Variable Resistor DI 4 CO 3 FI 2 Filter Amp Compressor Output Buffer + 1 Fo Compressor Mute 5.1K 3.3K CPI7 Summing Amp 11 Limiter Logic CB 13 Bypath EMUTE 12 CMUTE CPI+ 8 + BYPATH EPI- 16 Variable Resistor Summing Amp EPI+ 15 + Rectifier Expandor Mute Bias Circuit 20 Vcc 17 DO 18 ERC 19 EO 9 CB 14 EB 10 GND PIN CONFIGURATION FO FI CO DI AGIC CRC CPICPI+ CB GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 Vcc EO ERC DO EPIEPI+ EB EMUTE BYPATH CMUTE KA8507 S1T8507C 16 15 14 13 12 11 2 COMPANDER S1T8507C PIN DESCRIPTION Pin No 1 2 3 4 5 6 7 8 9 10 Symbol FO FI CO DI AGIC CRC CPI - CPI + CB GND Description Filter Amp Output Filter Amp Input Compressor Output Data Input AC Gain Infinity Capacitor Compressor Rectifier Capacitor Compressor Inverting Input Compressor Non-Inverting Input Compressor Reference Bias Ground Pin No 11 12 13 14 15 16 17 18 19 20 Symbol CMUTE BYPATH EMUTE EB EPI + EPI - DO ERC EO VCC Description Compressor Mute No companding Expander Mute Expander Reference Bias Expander Non-Inverting Input Expander Inverting Input Data Output Expander Rectifier Capacitor Expander Output Supply Voltage ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Power Dissipation S1T8507C01-D0B0 S1T8507C01-S0B0 Operating Temperature Storage Temperature Symbol VCC PD TOPR TSTG Value 10 1000 410 - 20 to + 70 - 55 to + 150 C C Unit V mW 3 S1T8507C COMPANDER ELECTRICAL CHARACTERISTICS (VCC = 3V, f = 1kHz, Ta = 25C, unless otherwise noted) Characteristic Symbol Test Condition - No Signal Min. - - Typ. Max. Unit DC ELECTRICAL CHARACTERISTICS Operating Voltage Operating Current COMPRESSOR PART Standard Input Voltage (0dB) Gain Difference VI (COMP) GV1 (COMP) GV2 (COMP) Bypath Gain Difference Output Distortion Noise Output Voltage Mute Attenuation Ratio Limiting Voltage EXPANDER PART Standard Output Level (0dB) VO (EXP) GV1 (EXP) Gain Difference GV2 (EXP) GV3 (EXP) Bypath Gain Difference Output Distortion Noise Output Voltage Mute Attenuation Ratio Max. Output Voltage GVB (EXP) THD EXP VNO (EXP) ATT MUTE VOEXP (MAX) Vin = 30mVrms = 0dB Vin = -10dB-0.5 Vin = -20dB Vin = -30dB Vin = 0dB, BYPATH = GND Vin = 0dB Rg = 620ohm Vin = 0dB, EMUTE = GND THD = 10% 110 -0.5 -1.0 -1.5 -2.5 - - 60 700 130 0 0 0 0 0.5 10.0 80 800 160 +0.5 +1.0 +2.0 +0.5 1.5 30.0 - - dB % Vrms dB mVrms dB mVrms GVB (COMP) THD COMP VNO (COMP) ATT MUTE VLIM (COMP) VCC = 300mVrms = 0dB Vin = -20dB Vin = -40dB Vin = 0dB, BYPATH = GND Vin = 0dB Rg = 620ohm Vin = 0dB, CMUTE = GND - 8.0 -0.5 -1.0 -1.5 - - 60 1.15 12.5 0 0 0 0.5 3.0 80 1.35 17.0 +0.5 +1.0 +1.5 1.0 5.5 - 1.50 dB % mVrms dB Vp-p mVrms dB VCC ICC 2.4 4.0 7.0 6.5 V mA 4 COMPANDER S1T8507C TEST CIRCUIT COMP OUT 10K 100K 1F + + 1 FO Vcc 20 10uF 2 1F + + 3 CO ERC 18 2.2uF 4 DI DO 17 51K EPI16 10K 474 6 CRC EPI+ 15 620 100K 9.1K + 0.47uF 474 8 620 9 12 CPI+ EMUTE 13 + 7 CPIEB 14 4.7uF EXP IN 50pF + 1.0uF SW3 SW2 SW1 FI EO 19 Vcc + 1.0uF EXP OUT 10K KA8507 S1T8507C 22uF + 2.2uF + 5 AGIC COMP IN 4.7uF 10 GND CMUTE 11 + CB BYPATH 5 COMPANDER Speaker 473 + 390K 2.2F 33K 18 17 16 15 Vcc + 47F 20 19 473 10K 0.47F Data output Expander input 104 + 47K + 10F Expander Mute Compressor Mute 14 13 12 11 Exp + REG LOGIC + + Filter Amp - Comp + 51K 3.3K REG 1 2 3 4 33K 101 33K TO TX Modulation 104 5.6K 132 120K 39K 473 5 6 7 + + 22F + 22F 2.2F 8.2K 1F 8 223 103 9 2.2K 10 APPLICATION CIRCUIT MIC S1T8507C (HAND SET) 6 |
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