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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
Y Y Y Y Y
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
Applications
Y Y Y
Features
Y Y
Y Y Y Y
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
TL H 6975 2
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
b6
Conditions
LM567C LM567CM Max 90 8 13 15 25 10 Min 4 75 Typ 50 7 12 20 20 15 6
b6
Units V mA mA kX
Max 90 10 15
IL e 100 mA fi e fo IC e 100 mA fi e fo
25
mVrms mVrms dB dB
12
14 1
g0 1 g1
16 2
10
14 2
g0 1
18 3
% of fo % of fo % C
g2
g1
g5
%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
100
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
2
Schematic Diagram
TL H 6975 3
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
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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5
Typical Applications (Continued)
Oscillator with Quadrature Output Oscillator with Double Frequency Output
Connect Pin 3 to 2 8V to Invert Output
TL H 69756
TL H 6975 7
Precision Oscillator Drive 100 mA Loads
TL H 6975 8
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
0
TL H 69759
fi e 100 kHz a 5V Note Adjust for fo e 100 kHz
6
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
7
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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