Lm3189 Fm If System - National SemiconductorThe LM3189N is a monolithic integrated circuit that provides
all the functions of a comprehensive FM IF system. The
block diagram of the LM3189N includes a three stage FM IF
Amplifier limiter configuration with level detectors for each
stage, a doubly balanced quadrature FM detector and an
Audio Amplifier that features the optional use of a muting
(squelch) circuit.
The advanced circuit design of the IF system includes desir-
able deluxe features such as programmable delayed AGC
for the RF Tuner an AFC drive circuit, and an output signal
to drive a tuning meter and/or provide stereo switching log-
ic. In addition, internal power supply Regulators maintain a
nearly constant current drain over the voltage supply range
of a8.5V to a16V.
The LM3189N is ideal for high fidelity operation. Distortion
in an LM3189N FM IF system is primarily a function of the
phase linearity characteristic of the outboard detector coil.
The LM3189N has all the features of the LM3089N plus
additions. By National Semiconductor Corporation
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