TLH7149

September 1992

LM3089 FM Receiver IF System

General Description

The LM3089 has been designed to provide all the major

functions required for modern FM IF designs of automotive

high-fidelity and communications receivers

Features

Y

Three stage IF amplifierlimiter provides 12 mV (typ)

b

3 dB limiting sensitivity

Y

Balanced product detector and audio amplifier provide

400 mV (typ) of recovered audio with distortion as low

as 01% with proper external coil designs

Y

Four internal carrier level detectors provide delayed

AGC signal to tuner IF level meter drive current and in-

terchannel mute control

Y

AFC amplifier provides AFC current for tuner andor

center tuning meters

Y

Improved operating and temperature performance es-

pecially when using high Q quadrature coils in narrow

band FM communications receivers

Y

No mute circuit latchup problems

Y

A direct replacement for CA3089E

Connection Diagram

Dual-In-Line Package

TLH7149 – 2

Top View

Order Number LM3089N

See NS Package Number N16E

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A