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LM566C Voltage Controlled Oscillator
Y
General Description
The LM566CN is a general purpose voltage controlled oscillator which may be used to generate square and triangular
waves, the frequency of which is a very linear function of a
control voltage. The frequency is also a function of an external resistor and capacitor.
The LM566CN is specified for operation over the 0
a
70§C temperature range.
Cto
§
Features
Y
Wide supply voltage range: 10V to 24V
Y
Very linear modulation characteristics
High temperature stability
Y
Excellent supply voltage rejection
Y
10 to 1 frequency range with fixed capacitor
Y
Frequency programmable by means of current, voltage,
resistor or capacitor
Applications
Y
FM modulation
Y
Signal generation
Y
Function generation
Y
Frequency shift keying
Y
Tone generation
LM566C Voltage Controlled Oscillator
February 1995
Connection Diagram
Dual-In-Line Package
Order Number LM566CN
See NS Package Number N08E
Typical Application
1 kHz and 10 kHz TTL Compatible
Voltage Controlled Oscillator
TL/H/7854– 2
TL/H/7854– 3
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
TL/H/7854
Page 2
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Power Supply Voltage 26V
Power Dissipation (Note 1) 1000 mW
Operating Temperature Range, LM566CN 0
Lead Temperature (Soldering, 10 sec.)
Ctoa70§C
§
a
260§C
Electrical Characteristics V
Parameter Conditions
CC
e
12V, T
e
25§C, AC Test Circuit
A
LM566C
Units
Min Typ Max
Maximum Operating R0e2k
Frequency C0
VCO Free-Running C
Frequency R
e
2.7 pF
e
1.5 nF
O
e
20k
O
e
f
10 kHz
O
Input Voltage Range Pin 5 */4 V
Average Temperature Coefficient
of Operating Frequency
0.5 1 MHz
b
30 0
CC
a
30 %
V
CC
200 ppm/
C
§
Supply Voltage Rejection 10–20V 0.1 2 %/V
Input Impedance Pin 5 0.5 1 MX
VCO Sensitivity For Pin 5, From
e
O
10% Deviation 0.2 1.5 %
FM Distortion
8–10V, f
g
10 kHz
6.0 6.6 7.2 kHz/V
Maximum Sweep Rate 1 MHz
Sweep Range 10:1
Output Impedance
Pin 3 50 X
Pin 4 50 X
Square Wave Output Level R
Triangle Wave Output Level R
e
10k 5.0 5.4 Vp-p
L1
e
10k 2.0 2.4 Vp-p
L2
Square Wave Duty Cycle 40 50 60 %
Square Wave Rise Time 20 ns
Square Wave Fall Time 50 ns
Triangle Wave Linearity
Note 1: The maximum junction temperature of the LM566CN is 150§C. For operation at elevated junction temperatures, maximum power dissipation must be
derated based on a thermal resistance of 115
a
1V Segment at
(/2 V
CC
C/W, junction to ambient.
§
0.5 %
Applications Information
The LM566CN may be operated from either a single supply
as shown in this test circuit, or from a split (
ply. When operating from a split supply, the square wave
output (pin 3) is TTL compatible (2 mA current sink) with the
addition of a 4.7 kX resistor from pin 3 to ground.
g
) power sup-
A 0.001 mF capacitor is connected between pins 5 and 6 to
prevent parasitic oscillations that may occur during VCO
switching.
a
b
2.4(V
e
f
O
ROCOV
V5)
a
where
k
2KkR
and V
20K
O
is voltage between pin 5 and pin 1.
5
2
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Schematic Diagram
TL/H/7854– 1
3
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Typical Performance Characteristics
Operating Frequency as a
Function of Timing Resistor
Power Supply Current Temperature Stability VCO Waveforms
Frequency Stability vs Load
Resistance (Square Wave
Output)
Operating Frequency as a
Function of Timing Capacitor
Frequency Stability vs Load
Impedance (Triangle Output)
Normalized Frequency as a
Function of Control Voltage
Square Wave Output
Characteristics
Triangle Wave Output
Characteristics
TL/H/7854– 4
AC Test Circuit
TL/H/7854– 5
TL/H/7854– 6
4
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5
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Physical Dimensions inches (millimeters)
LM566C Voltage Controlled Oscillator
Molded Dual-In-Line Package (N)
Order Number LM566CN
NS Package Number N08E
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failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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Corporation Europe Hong Kong Ltd. Japan Ltd.
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