LM566C Voltage Controlled Oscillator Y General Description Y 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§ C to a 70§ C temperature range. Y Y Applications Y Y Features Y Y Y Y Wide supply voltage range: 10V to 24V Very linear modulation characteristics Y Connection Diagram High temperature stability Excellent supply voltage rejection 10 to 1 frequency range with fixed capacitor Frequency programmable by means of current, voltage, resistor or capacitor FM modulation Signal generation Function generation Frequency shift keying Tone generation Typical Application Dual-In-Line Package 1 kHz and 10 kHz TTL Compatible Voltage Controlled Oscillator TL/H/7854 – 2 Order Number LM566CN See NS Package Number N08E TL/H/7854 – 3 C1995 National Semiconductor Corporation TL/H/7854 RRD-B30M115/Printed in U. S. A. LM566C Voltage Controlled Oscillator February 1995 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 Power Dissipation (Note 1) Operating Temperature Range, LM566CN 26V 1000 mW 0§ C to a 70§ C Lead Temperature (Soldering, 10 sec.) a 260§ C Electrical Characteristics VCC e 12V, TA e 25§ C, AC Test Circuit Parameter LM566C Conditions Min Typ Maximum Operating Frequency R0 e 2k C0 e 2.7 pF 0.5 1 VCO Free-Running Frequency CO e 1.5 nF RO e 20k fO e 10 kHz b 30 0 */4 VCC Input Voltage Range Pin 5 Average Temperature Coefficient of Operating Frequency Supply Voltage Rejection MHz a 30 10–20V 0.1 VCO Sensitivity For Pin 5, From 8–10V, fO e 10 kHz FM Distortion g 10% Deviation ppm/§ C 2 0.5 1 6.0 6.6 7.2 0.2 1.5 Maximum Sweep Rate %/V MX 1 Sweep Range % VCC 200 Input Impedance Pin 5 kHz/V % MHz 10:1 Output Impedance Pin 3 50 Pin 4 X Vp-p RL1 e 10k 5.0 5.4 Triangle Wave Output Level RL2 e 10k 2.0 2.4 40 50 Square Wave Duty Cycle Square Wave Rise Time Square Wave Fall Time a 1V Segment at (/2 VCC X 50 Square Wave Output Level Triangle Wave Linearity Units Max Vp-p 60 % 20 ns 50 ns 0.5 % 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§ C/W, junction to ambient. Applications Information A 0.001 mF capacitor is connected between pins 5 and 6 to prevent parasitic oscillations that may occur during VCO switching. The LM566CN may be operated from either a single supply as shown in this test circuit, or from a split ( g ) power supply. 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. fO e 2.4(V a b V5) RO CO V a where 2K k RO k 20K and V5 is voltage between pin 5 and pin 1. 2 TL/H/7854 – 1 Schematic Diagram 3 Typical Performance Characteristics Operating Frequency as a Function of Timing Resistor Operating Frequency as a Function of Timing Capacitor Power Supply Current Temperature Stability Frequency Stability vs Load Resistance (Square Wave Output) Frequency Stability vs Load Impedance (Triangle Output) Normalized Frequency as a Function of Control Voltage VCO Waveforms Square Wave Output Characteristics TL/H/7854 – 4 Triangle Wave Output Characteristics AC Test Circuit TL/H/7854 – 5 TL/H/7854 – 6 4 5 LM566C Voltage Controlled Oscillator Physical Dimensions inches (millimeters) Molded Dual-In-Line Package (N) Order Number LM566CN NS Package Number N08E LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. 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