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LM3189N Datasheet

  • LM3189N

  • LM3189 FM IF System

  • 8頁

  • NSC

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LM3189 FM IF System
April 1987
LM3189 FM IF System
General Description
The 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
a
8 5V to
a
16V
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
The LM3189N utilizes the 16-lead dual-in-line plastic pack-
age and can operate over the ambient temperature range of
b
40 C to
a
85 C
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Exceptional limiting sensitivity 12
mV
typ at
b
3 dB
point
Low distortion 0 1% typ (with double-tuned coil)
Single-coil tuning capability
Improved (S
a
N) N ratio
Externally programmable recovered audio level
Provides specific signal for control of inter-channel mut-
ing (squelch)
Provides specific signal for direct drive of a tuning me-
ter
On channel step for search control
Provides programmable AGC voltage for RF amplifier
Provides a specific circuit for flexible audio output
Internal supply voltage regulators
Externally programmable ON channel step width and
deviation at which muting occurs
Block Diagram
TL H 7960 鈥?1
All resistance values are in
X
L tunes with 100 pF (C) at 10 7 MHz Q
0
j
75
(Toko No KACS K586HM or equivalent)
C
1995 National Semiconductor Corporation
TL H 7960
RRD-B30M115 Printed in U S A

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