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LM567 LM567C Tone Decoder

February 1995

LM567 LM567C Tone Decoder
General Description
The LM567 and LM567C are general purpose tone decoders designed to provide a saturated transistor switch to ground when an input signal is present within the passband The circuit consists of an I and Q detector driven by a voltage controlled oscillator which determines the center frequency of the decoder External components are used to independently set center frequency bandwidth and output delay

Bandwidth adjustable from 0 to 14% High rejection of out of band signals and noise Immunity to false signals Highly stable center frequency Center frequency adjustable from 0 01 Hz to 500 kHz




20 to 1 frequency range with an external resistor Logic compatible output with 100 mA current sinking capability

Touch tone decoding Precision oscillator Frequency monitoring and control Wide band FSK demodulation Ultrasonic controls Carrier current remote controls Communications paging decoders

Connection Diagrams
Metal Can Package Dual-In-Line and Small Outline Packages

TL H 6975 1

Top View Order Number LM567H or LM567CH See NS Package Number H08C Top View Order Number LM567CM See NS Package Number M08A Order Number LM567CN See NS Package Number N08E

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C1995 National Semiconductor Corporation

TL H 6975

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 Pin Power Dissipation (Note 1) V8 V3 V3 Storage Temperature Range Operating Temperature Range LM567H LM567CH LM567CM LM567CN 9V 1100 mW 15V b 10V V4 a 0 5V b 65 C to a 150 C
b 55 C to a 125 C 0 C to a 70 C

Soldering Information Dual-In-Line Package Soldering (10 sec ) Small Outline Package Vapor Phase (60 sec ) Infrared (15 sec )

260 C

215 C 220 C See AN-450 ``Surface Mounting Methods and Their Effect on Product Reliability'' for other methods of soldering surface mount devices

Electrical Characteristics AC Test Circuit
Parameters Power Supply Voltage Range Power Supply Current Quiescent Power Supply Current Activated Input Resistance Smallest Detectable Input Voltage Largest No Output Input Voltage Largest Simultaneous Outband Signal to Inband Signal Ratio Minimum Input Signal to Wideband Noise Ratio Largest Detection Bandwidth Largest Detection Bandwidth Skew Largest Detection Bandwidth Variation with Temperature Largest Detection Bandwidth Variation with 4 75 b 6 75V Supply Voltage Highest Center Frequency Center Frequency Stability (4 755 75V) Bn e 140 kHz RL e 20k RL e 20k

TA e 25 C V a e 5V LM567 Min 4 75 Typ 50 6 11 18 20 20 10 15 6


LM567C LM567CM Max 90 8 13 15 25 10 Min 4 75 Typ 50 7 12 20 20 15 6

Units V mA mA kX

Max 90 10 15

IL e 100 mA fi e fo IC e 100 mA fi e fo


mVrms mVrms dB dB


14 1
g0 1 g1

16 2


14 2
g0 1

18 3

% of fo % of fo % C




%V kHz ppm C ppm C

100 0 k TA k 70 b 55 k TA k a 125

500 35 g 60 35 g 140 05 fo 20 10 20 25 04 10


500 35 g 60 35 g 140 04 fo 20 0 01 02 06 30 150 25 04 10 20 20

Center Frequency Shift with Supply Voltage 4 75V b 6 75V 4 75V b 9V Fastest ON-OFF Cycling Rate Output Leakage Current Output Saturation Voltage Output Fall Time Output Rise Time V8 e 15V ei e 25 mV I8 e 30 mA ei e 25 mV I8 e 100 mA

% V % V mA V ns ns

0 01 02 06 30 150

Note 1 The maximum junction temperature of the LM567 and LM567C is 150 C For operating 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 For the DIP the device must be derated based on a thermal resistance of 110 C W junction to ambient For the Small Outline package the device must be derated based on a thermal resistance of 160 C W junction to ambient Note 2 Refer to RETS567X drawing for specifications of military LM567H version


Schematic Diagram

TL H 6975 3


Typical Performance Characteristics
Typical Frequency Drift Typical Bandwidth Variation Typical Frequency Drift

Typical Frequency Drift

Bandwidth vs Input Signal Amplitude

Largest Detection Bandwidth

Detection Bandwidth as a Function of C2 and C3

Typical Supply Current vs Supply Voltage

Greatest Number of Cycles Before Output

Typical Output Voltage vs Temperature

TL H 6975 4


Typical Applications
Touch-Tone Decoder

Component values (typ) R1 6 8 to 15k R2 4 7k R3 20k C1 0 10 mfd C2 1 0 mfd 6V C3 2 2 mfd 6V C4 250 mfd 6V

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Typical Applications (Continued)
Oscillator with Quadrature Output Oscillator with Double Frequency Output

Connect Pin 3 to 2 8V to Invert Output

TL H 69756

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Precision Oscillator Drive 100 mA Loads

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AC Test Circuit

Applications Information
The center frequency of the tone decoder is equal to the free running frequency of the VCO This is given by 1 1 1 R1C1 The bandwidth of the filter may be found from the approximation Vi BW e 1070 in % of fo foC2 Where Vi e Input voltage (volts rms) Vi s 200 mV C2 e Capacitance at Pin 2 (mF) fo j


TL H 69759

fi e 100 kHz a 5V Note Adjust for fo e 100 kHz


Physical Dimensions inches (millimeters)

Metal Can Package (H) Order Number LM567H or LM567CH NS Package Number H08C

Small Outline Package (M) Order Number LM567CM NS Package Number M08A


LM567 LM567C Tone Decoder

Physical Dimensions inches (millimeters) (Continued)

Molded Dual-In-Line Package (N) Order Number LM567CN NS Package Number N08E

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