LM3089 - National Semiconductor

LM3089 LM3089 FM Receiver IF System

The LM3089 has been designed to provide all the major functions required for modern FM IF designs of automotive high-fidelity and communications receivers Y Y Features Y Y Y Three stage IF amplifier limiter provides 12 mV (typ) b 3 dB limiting sensitivity Balanced product detector and audio amplifier provide 400 mV (typ) of recovered audio with distortio.

Features

Y Y Y Three stage IF amplifier limiter provides 12 mV (typ) b 3 dB limiting sensitivity Balanced product detector and audio amplifier provide 400 mV (typ) of recovered audio with distortion as low as 0 1% with proper external coil designs Y Y Four internal carrier level detectors provide delayed AGC signal to tuner IF level meter drive current and interchannel mute control AFC amplifier provides AFC current for tuner and or center tuning meters Improved operating and temperature performance especially when using high Q quadrature coils in narrow band FM communications receivers No mute cir.