National Semiconductor LM3089 Technical data
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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 amplifier/limiter 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 0.1% with proper external coil designs.
Connection Diagram
Y
Four internal carrier level detectors provide delayed
AGC signal to tuner, IF level meter drive current and interchannel mute control
Y
AFC amplifier provides AFC current for tuner and/or
center tuning meters
Y
Improved operating and temperature performance, especially when using high Q quadrature coils in narrow
band FM communications receivers
Y
No mute circuit latchup problems
Y
A direct replacement for CA3089E
Dual-In-Line Package
LM3089 FM Receiver IF System
September 1992
Top View
TL/H/7149– 2
Order Number LM3089N
See NS Package Number N16E
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
TL/H/7149
Block Diagram
TL/H/7149– 1
Toko America
1250 Feehanville Drive
Mount Prospect, IL 60056
(312) 297-0070
2
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