LM1391 Phase-Locked Loop
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
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Features
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Internal active regulator for improved supply rejection
Uncommitted collector of output transistor
Output transistor with low saturation and high voltage
swing
APC of the oscillator with a synchronizing signal
DC controlled output duty cycle
g
300 Hz typical pull-in
Linear balanced phase detector
Low thermal frequency drift
Small static phase error
Adjustable DC loop gain
Schematic Diagram
TL H 7889 鈥?1
( ) Pin 4 Base of Q16 (LM1391) for use with (
a
) flyback pulse
C
1995 National Semiconductor Corporation
TL H 7889
RRD-B30M115 Printed in U S A