Datasheet > LM3189

LM3189

更新时间： 2024-10-28 22:47:07

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
8页	213K
描述
LM3189 FM IF System

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LM3189 数据手册

April 1987

LM3189 FM IF System

General Description

Features

Exceptional limiting sensitivity: 12 mV typ at

point

3 dB

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.

Low distortion: 0.1% typ (with double-tuned coil)

Single-coil tuning capability

Externally programmable recovered audio level

Improved (S

N)/N ratio

Provides specific signal for control of inter-channel mut-

ing (squelch)

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

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

a a

of 8.5V to 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.

Externally programmable ON channel step width, and

deviation at which muting occurs

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

40 C to 85 C.

Block Diagram

TL/H/7960–1

All resistance values are in X

*L tunes with 100 pF (C) at 10.7 MHz, Q

(Toko No. KACS K586HM or equivalent)

1995 National Semiconductor Corporation

TL/H/7960

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7 8

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