TLH7889

February 1995

LM1391 Phase-Locked Loop

General Description

The LM1391 integrated circuit has been designed primarily

for use in the horizontal section of TV receivers but may

find use in other low frequency signal processing applica-

tions It includes a stable VCO linear pulse phase detector

and variable duty cycle output driver

Features

Y

Internal active regulator for improved supply rejection

Y

Uncommitted collector of output transistor

Y

Output transistor with low saturation and high voltage

swing

Y

APC of the oscillator with a synchronizing signal

Y

DC controlled output duty cycle

Y

g

300 Hz typical pull-in

Y

Linear balanced phase detector

Y

Low thermal frequency drift

Y

Small static phase error

Y

Adjustable DC loop gain

Schematic Diagram

TLH7889 – 1

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A