SL6270C

THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS DS 3301 -1 SL6270C GAIN CONTROLLED MICROPHONE PREAMPLIFIER/VOGAD The SL6270 is a silicon integrated circuit combining the functions of audio amplifier and voice operated gain adjusting device (VOGAD). It is designed to accept signals from a low sensitivity microphone and to provide an essentially constant output signal for a 50dB range of input. The dynamic range, attack and decay times are controlled by external components. MAIN AMP OUTPUT MAIN AMP INPUT 7 0V 6 5 PREAMP INPUT PREAMP INPUT 4 3 V CC 8 1 2 PREAMP OUTPUT AGC TIME CONST CM8 Fig. 1 Pin connections, SL6270 - CM (bottom view) FEATURES Constant Output Signal Fast Attack Low Power Consumption Simple Circuitry AGC TIME CONST PREAMP OUPUT V CC PREAMP INPUT 1 2 3 4 8 7 6 5 MAIN AMP OUTPUT MAIN AMP INPUT 0V PREAMP INPUT APPLICATIONS Audio AGC Systems Transmitter Overmodulation Protection Tape Recorders DP8, MP8 Fig. 2 Pin connections, SL6270 - DP (top view) QUICK REFERENCE DATA Supply Voltage: 4.5V to 10V Voltage Gain: 52dB 100n V CC PREAMP OUTPUT 2 MAIN AMP 7 INPUT 10k 680 ABSOLUTE MAXIMUM RATINGS Supply voltage: 12V Storage temperature: -55°C to +125°C 4 PREAMP INPUTS 8 5 MAIN AMP OUTPUT AGC 2k AGC DETECTOR EARTH 6 1 AGC TIME CONSTANT R T C T Fig. 3 SL6270 block diagram SL6270C ELECTRICAL CHARACTERISTICS Test conditions (unless otherwise stated): Supply voltage Vcc: 6V Input signal frequency: 1kHz Ambient t...