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| LM565 LM565C Phase Locked Loop February 1995 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 b55 C to a 125 C military temperature range The LM565CN is specified for operation over the 0 C to a 70 C temperature range Y Y Y Linear triangle wave with in phase zero crossings available TTL and DTL compatible phase detector input and square wave output Adjustable hold in range from g1% to l g60% Applications Y Y Y Y Y Y Y Y Features Y Y Y Y Y Y 200 ppm C frequency stability of the VCO Power supply range of g5 to g12 volts with 100 ppm % typical 0 2% linearity of demodulated output Data and tape synchronization Modems FSK demodulation FM demodulation Frequency synthesizer Tone decoding Frequency multiplication and division SCA demodulators Telemetry receivers Signal regeneration Coherent demodulators Connection Diagrams Metal Can Package Dual-In-Line Package TL H 7853 - 2 TL H 7853 - 3 Order Number LM565H See NS Package Number H10C Order Number LM565CN See NS Package Number N14A C1995 National Semiconductor Corporation TL H 7853 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Power Dissipation (Note 1) Differential Input Voltage g12V Operating Temperature Range LM565H LM565CN Storage Temperature Range Lead Temperature (Soldering 10 sec ) b 55 C to a 125 C 0 C to a 70 C b 65 C to a 150 C 1400 mW g1V 260 C Electrical Characteristics AC Test Circuit Parameter Power Supply Current Input Impedance (Pins 2 3) VCO Maximum Operating Frequency VCO Free-Running Frequency Operating Frequency Temperature Coefficient Frequency Drift with Supply Voltage Triangle Wave Output Voltage Triangle Wave Output Linearity Square Wave Output Level Output Impedance (Pin 4) Square Wave Duty Cycle Square Wave Rise Time Square Wave Fall Time Output Current Sink (Pin 4) VCO Sensitivity Demodulated Output Voltage (Pin 7) Total Harmonic Distortion Output Impedance (Pin 7) DC Level (Pin 7) Output Offset Voltage lV7 b V6l Temperature Drift of lV7 b V6l AM Rejection Phase Detector Sensitivity KD fo e 10 kHz b 4V k V2 V3 k 0V TA e 25 C VCC e g6V LM565 Min Typ 80 7 300 10 500 250 Max 12 5 Min LM565C Typ 80 5 500 Max 12 5 mA kX kHz Units Conditions Co e 2 7 pF Co e 1 5 nF Ro e 20 kX fo e 10 kHz b 10 0 a 10 b 30 0 a 30 % b 100 b 200 ppm C 15 3 %V Vp-p % Vp-p kX 60 % ns ns mA Hz V 450 15 mVp-p % kX 50 200 V mV mV C dB V radian 01 2 24 02 47 54 5 45 50 20 50 06 1 6600 250 300 02 35 4 25 45 30 500 30 40 68 10 3 2 02 24 05 47 54 5 55 40 50 20 50 06 1 6600 g10% Frequency Deviation 400 0 75 200 300 02 35 g10% Frequency Deviation 4 75 100 40 45 50 500 40 68 Note 1 The maximum junction temperature of the LM565 and LM565C is a 150 C For operation at elevated temperatures devices in the TO-5 package must be derated based on a thermal resistance of a 150 C W junction to ambient or a 45 C W junction to case Thermal resistance of the dual-in-line package is a 85 C W 2 Typical Performance Characteristics Power Supply Current as a Function of Supply Voltage Lock Range as a Function of Input Voltage VCO Frequency Oscillator Output Waveforms Phase Shift vs Frequency VCO Frequency as a Function of Temperature Loop Gain vs Load Resistance Hold in Range as a Function of R6- 7 TL H 7853 - 4 3 Schematic Diagram 4 TL H 7853 - 1 AC Test Circuit TL H 7853 - 5 Note S1 open for output offset voltage (V7 b V6) measurement Typical Applications 2400 Hz Synchronous AM Demodulator TL H 7853 - 6 5 Typical Applications (Continued) FSK Demodulator (2025 - 2225 cps) TL H 7853 - 7 FSK Demodulator with DC Restoration TL H 7853 - 8 6 Typical Applications (Continued) Frequency Multiplier ( c 10) TL H 7853 - 9 IRIG Channel 13 Demodulator TL H 7853 - 10 7 Applications Information In designing with phase locked loops such as the LM565 the important parameters of interest are FREE RUNNING FREQUENCY 03 fo j Ro Co 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 '' Loop gain e KoKD The natural bandwidth of the closed loop response may be found from fn e 1 2q 0R C Ko KD 11 Associated with this is a damping factor 1 1 2 R1C1KoKD 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 R1C1 k Ko KD the damping factor for the loop becomes quite small resulting in large overshoot and possible instability in the transient response of the loop In this case the natural frequency of the loop may be found from ee fn e 1 2q 0 radians sec volt volts e phase detector sensitivity KD radian The loop gain of the LM565 is dependent on supply voltage and may be found from Ko e oscillator sensitivity J 1 sec J J 33 6 fo Vc fo e VCO frequency in Hz Vc e total supply voltage to circuit 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 Ko KD e 8 fo Vc fo e free running frequency of VCO Vc e total supply voltage to the circuit fH e g 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 Lag Filter u1 a u2 e (R1 a R2) C1 R2 is selected to produce a desired damping factor e usually between 0 5 and 1 0 The damping factor is found from the approximation e q u2fn These two equations are plotted for convenience Filter Time Constant vs Natural Frequency 0u KoKD 1 a u2 TL H 7853 - 13 Damping Time Constant vs Natural Frequency TL H 7853 - 11 Lag-Lead Filter TL H 7853 - 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 8 TL H 7853 - 14 Capacitor C2 should be much smaller than C1 since its function is to provide filtering of carrier In general C2 s 0 1 C1 Physical Dimensions inches (millimeters) Metal Can Package (H) Order Number LM565H NS Package Number H10C 9 LM565 LM565C Phase Locked Loop Physical Dimensions inches (millimeters) (Continued) Dual-In-Line Package (N) Order Number LM565CN NS Package Number N14A 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 As used herein 1 Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness National Semiconductor Europe Fax (a49) 0-180-530 85 86 Email cnjwge tevm2 nsc com Deutsch Tel (a49) 0-180-530 85 85 English Tel (a49) 0-180-532 78 32 Fran ais Tel (a49) 0-180-532 93 58 Italiano Tel (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications |
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