
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 55C to
+125C military temperature range. The LM565CN is speci-
fied for operation over the 0C to +70C temperature range.
Features
n 200 ppm/C frequency stability of the VCO
n Power supply range of ±5to ±12 volts with 100 ppm/%
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
n Adjustable hold in range from ±1% to > ±60%
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
LM565/LM565C
Phase
Locked
Loop
1999 National Semiconductor Corporation
DS007853
www.national.com