Datasheet LM565CN Datasheet (NSC)

LM565/LM565C
Phase Locked Loop

General Description

The LM565 and LM565C are general purpose phase locked
loops containing a stable,highly linear voltage controlled os­cillator for low distortion FM demodulation, and a double bal­anced 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 fre­quency divider to obtain frequency multiplication.

The LM565H is specified for operation over the −55˚C to
+125˚C military temperature range. The LM565CN is speci­fied for operation over the 0˚C to +70˚C temperature range.

Features

n 200 ppm/˚C frequency stability of the VCO
n Power supply range of

typical

±

5to±12 volts with 100 ppm/

%

May 1999

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

LM565/LM565C Phase Locked Loop

Connection Diagrams

Metal Can Package

Order Number LM565H

See NS Package Number H10C

DS007853-2

Dual-in-Line Package

DS007853-3

Order Number LM565CN

See NS Package Number N14A

© 1999 National Semiconductor Corporation DS007853 www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage
Power Dissipation (Note 2) 1400 mW
Differential Input Voltage

±

12V

±

Operating Temperature Range

LM565H −55˚C to +125˚C

LM565CN 0˚C to +70˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature

(Soldering, 10 sec.) 260˚C

1V

Electrical Characteristics

AC Test Circuit, T

A

=

25˚C, V

Parameter Conditions

Power Supply Current 8.0 12.5 8.0 12.5 mA
Input Impedance (Pins 2, 3) −4V
VCO Maximum Operating

Frequency
VCO Free-Running Frequency C

Operating Frequency
Temperature Coefficient

Frequency Drift with
Supply Voltage

Triangle Wave Output Voltage 2 2.4 3 2 2.4 3 V
Triangle Wave Output Linearity 0.2 0.5
Square Wave Output Level 4.7 5.4 4.7 5.4 V
Output Impedance (Pin 4) 5 5 kΩ
Square Wave Duty Cycle 45 50 55 40 50 60
Square Wave Rise Time 20 20 ns
Square Wave Fall Time 50 50 ns
Output Current Sink (Pin 4) 0.6 1 0.6 1 mA
VCO Sensitivity f
Demodulated Output Voltage

(Pin 7)
Total Harmonic Distortion
Output Impedance (Pin 7) 3.5 3.5 kΩ
DC Level (Pin 7) 4.25 4.5 4.75 4.0 4.5 5.0 V
Output Offset Voltage

|V

|

7−V6

Temperature Drift of |V

7−V6

AM Rejection 30 40 40 dB
Phase Detector Sensitivity K

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is func­tional, but do not guarantee specific performance limits. Electrical CharacteristicsstateDCandACelectricalspecificationsunderparticulartestconditionswhichguar­antee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is
given, however, the typical value is a good indication of device performance.

Note 2: The maximum junction temperature of the LM565 and LM565C is +150˚C. For operation at elevated temperatures, devices in the TO-5 package must be
derated based on a thermal resistance of +150˚C/W junction to ambient or +45˚C/W junction to case. Thermal resistance of the dual-in-line package is +85˚C/W.

=

±

6V

CC

LM565 LM565C

Min Typ Max Min Typ Max

<

<

V2,V

=

C

2.7 pF

o

=

1.5 nF

o

=

20 kΩ

R

o

=

10 kHz

f

o

0V 7 10 5 kΩ

3

300 500 250 500 kHz

−10 0 +10 −30 0 +30

Units

−100 −200 ppm/˚C

0.1 1.0 0.2 1.5

=

10 kHz 6600 6600 Hz/V

o

±

10%Frequency Deviation

±

10%Frequency Deviation 0.2 0.75 0.2 1.5

250 300 400 200 300 450 mV

%

30 100 50 200 mV

| 500 500 µV/˚C

D

0.68 0.68 V/radian

%

%

%

%

/V

p-p

p-p

p-p

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Typical Performance Characteristics

Power Supply Current as a
Function of Supply Voltage

Oscillator Output
Waveforms

DS007853-14

DS007853-17

Lock Range as a Function
of Input Voltage

Phase Shift vs Frequency

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DS007853-18

VCO Frequency

DS007853-16

VCO Frequency as a
Function of Temperature

DS007853-19

Loop Gain vs Load
Resistance

DS007853-20

Hold in Range as a
Function of R

6–7

DS007853-21

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Schematic Diagram

DS007853-1

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AC Test Circuit

Note: S1open for output offset voltage (V7−V6) measurement.

Typical Applications

2400 Hz Synchronous AM Demodulator

DS007853-5

DS007853-6

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Typical Applications (Continued)

FSK Demodulator (2025–2225 cps)

FSK Demodulator with DC Restoration

DS007853-7

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DS007853-8

Typical Applications (Continued)

Frequency Multiplier (x10)

DS007853-9

IRIG Channel 13 Demodulator

DS007853-10

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Applications Information

In designing with phase locked loops such as the LM565, the
important parameters of interest are:

FREE RUNNING FREQUENCY

LOOP GAIN: relates the amount of phase change between
the input signal and the VCO signal for a shift in input signal
frequency (assuming the loop remains in lock). In servo
theory, this is called the “velocity error coefficient.”

The loop gain of the LM565 is dependent on supply voltage,
and may be found from:

Lag-Lead Filter

DS007853-12

A simple lag filter may be used for wide closed loop band­width applications such as modulation following where the
frequency deviation of the carrier is fairly high (greater than
10%), or where wideband modulating signals must be fol­lowed.

The natural bandwidth of the closed loop response may be
found from:

Associated with this is a damping factor:

=

f

VCO frequency in Hz

o

=

total supply voltage to circuit

V

c

Loop gain may be reduced by connecting a resistor between
pins 6 and 7; this reduces the load impedance on the output
amplifier and hence the loop gain.

HOLD IN RANGE: the range of frequencies that the loop will
remain in lock after initially being locked.

=

f

free running frequency of VCO

o

=

total supply voltage to the circuit

V

c

THE LOOP FILTER

In almost all applications, it will be desirable to filter the sig­nal at the output of the phase detector (pin 7); this filter may
take one of two forms:

Simple Lead Filter

DS007853-11

For narrow band applications where a narrow noise band­width is desired, such as applications involving tracking a
slowly varying carrier,a lead lag filter should be used. In gen­eral, if 1/R
comes quite small resulting in large overshoot and possible

<

KoKD, the damping factor for the loop be-

1C1

instability in the transient response of the loop. In this case,
the natural frequency of the loop may be found from

R2is selected to produce a desired damping factor δ, usually
between 0.5 and 1.0. The damping factor is found from the
approximation:

δ ) πτ

2fn

These two equations are plotted for convenience.

Filter Time Constant vs Natural Frequency

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DS007853-13

Applications Information (Continued)

Damping Time Constant vs Natural Frequency

DS007853-14

Capacitor C

tion is to provide filtering of carrier. In general C

should be much smaller than C1since its func-

2

≤ 0.1 C1.

2

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Physical Dimensions inches (millimeters) unless otherwise noted

Metal Can Package (H)
Order Number LM565H

NS Package Number H10C

Dual-In-Line Package (N)
Order Number LM565CN

NS Package Number N14A

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Notes

LM565/LM565C Phase Locked Loop

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can be reasonably expected to cause the failure of
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labeling, can be reasonably expected to result in a
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