Datasheet > LM1865M

LM1865M

更新时间： 2024-09-13 22:51:55

品牌	Logo	应用领域
美国国家半导体 - NSC		商用集成电路光电二极管
页数	文件大小	规格书
16页	310K
描述
Advanced FM IF System

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LM1865M 数据手册

February 1995

LM1865 Advanced FM IF System

Meter output proportional to signal level

General Description

Stop detector with open-collector output

Reduced external component cost, improved performance,

and additonal functions are key features to the LM1865 FM

IF system. The LM1865 is designed for use in electronically

tuned radio applications. It contains both deviation and sig-

nal level stop circuitry in addition to an open-collector stop

output. The LM1865 generates a reverse AGC voltage (ie:

decreasing AGC voltage with increasing signal).

Adjustable signal level mute/stop threshold, controlled

either by ultrasonic noise in the recovered audio or by

the meter output

Adjustable deviation mute/stop threshold

Separate time constants for signal level and deviation

mute/stop

Dual threshold AGC eliminates need for local/distance

switch and offers improved immunity from third order in-

termodulation products due to tuner overload

Features

On-chip buffer to provide gain and terminate two ce-

ramic filters

User control of both AGC thresholds

Low distortion 0.1% typical with a single tuned quadra-

ture coil for 100% modulation.

Excellent signal to noise ratio, AM rejection and system

limiting sensitivity

Broad off frequency distortion characteristic

Low THD at minimum AFT offset

Block Diagram

Order Number LM1865M

or LM1865N

See NS Package Number

M20B or N20A

TL/H/7509–1

FIGURE 1

1995 National Semiconductor Corporation

TL/H/7509

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

12 3 4 5 6 7...16

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