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SL6270C

Part Number	SL6270C
Manufacturer	GEC Plessey Semiconductors
Description	Gain Controlled Microphone Preamplifier / Vogad
Published	Nov 14, 2005
Detailed Description	THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS DS 3301 -1 SL6270C GAIN CONTROLL...
Datasheet	SL6270C PDF File

Overview

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 temperature: -30°C to +85°C Test circuit shown in Fig.
4 Value Characteristics Min.
Supply current Input impedance Differential impedance Voltage gain Output level THD Equivalent noise input voltage 40 55 Typ.
5 150 300 52 90 2 1 140 5 Max.
10 mA Ω Ω dB % µV 72µV rms input pin 4 90mV rms input pin 4 300Ω source, 400Hz to 25kHz bandwidth mV rms 4MV rms input pin 4 Pin 4 or 5 Units Conditions +6V 2.
2µ EXTERNAL 4.
7n 4.
7n 10k 1 2 3 4 8 7 6 5 10µ OUTPUT (1k MIN LOAD) 680 EXTERNAL 2.
2µ 8 47µ 1...

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SL6270C Gain Controlled Microphone Preamplifier / Vogad - GEC Plessey Semiconductors

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