SL621

SL621 AGC GENERATOR DS3631 - 1.0 The SL621C is an AGC generator designed specifically for use in SSB receivers in conjunction with the SL61OC, SL611C and SL612C RF and lF amplifiers. In common with other advanced systems it generates a su itable AGC voltage directly from the detected audio waveform, provides a ‘hold’ period to maintain the AGC level during pauses in speech, and is immune to noise interference. In addition it will smoothly follow the fading signals characteristic of HF communication. When used in a receiver comprising one SL610C and one SL612C amplifier and a suitable detector, the SL621C will maintain the output within a 4dB range for a 11OdB range of receiver input signal CM8 Fig.1 Pin connections (bottom view) FEATURES ■ All Time Constants Set Externally ■ Easy Interfacing ■ Compaticle with SL610/611/612 APPLICATIONS ■ SSB Receivers ■ Test Equipment QUICK REFERENCE DATA ■ Supply voltage: 6V ■ Supply current: 3mA ODERING INFORMATION SL621 C CM SL621 CB CM ABSOLUTE MAXIMUM RATINGS Supply voltage: 12V Storage temperature: Operating temperature range Chip operating temperature Thermal resistance Chip-to-ambient Chip-to-case -65°C to +150°C -30°C to +85°C +175°C 225°C/W 65°C/W Fig.2 Block diagram SL621 ELECTRICAL CHARACTERISTICS These characteristics are guaranteed over the following conditions (unless otherwise stated) Supply voltage VCC = 6V Ambient temperature: 22°C ± 2°C Test frequency: 1KHz Test circuit as Fig.2 Characteristics Supply current Cut-o...