LM565/LM565C

Phase Locked Loop

General Description

The LM565 and LM565C are general purpose phase locked

loops containing a stable, highly linear voltage controlled os-

cillator for low distortion FM demodulation, and a double bal-

anced phase detector with good carrier suppression. The

VCO frequency is set with an external resistor and capacitor,

and a tuning range of 10:1 can be obtained with the same

capacitor.

The

characteristics

of

the

closed

loop

system — bandwidth, response speed, capture and pull in

range — may be adjusted over a wide range with an external

resistor and capacitor. The loop may be broken between the

VCO and the phase detector for insertion of a digital fre-

quency divider to obtain frequency multiplication.

The LM565H is specified for operation over the −55˚C to

+125˚C military temperature range. The LM565CN is speci-

fied for operation over the 0˚C to +70˚C temperature range.

Features

n 200 ppm/˚C frequency stability of the VCO

typical

n 0.2% linearity of demodulated output

n Linear triangle wave with in phase zero crossings

available

n TTL and DTL compatible phase detector input and

square wave output

Applications

n Data and tape synchronization

n Modems

n FSK demodulation

n FM demodulation

n Frequency synthesizer

n Tone decoding

n Frequency multiplication and division

n SCA demodulators

n Telemetry receivers

n Signal regeneration

n Coherent demodulators

Connection Diagrams

Metal Can Package

DS007853-2

Order Number LM565H

See NS Package Number H10C

Dual-in-Line Package

DS007853-3

Order Number LM565CN

See NS Package Number N14A

May 1999

© 1999 National Semiconductor Corporation

DS007853

www.national.com