Tone Decoder - National Semiconductor
Description
LM567/LM567C Tone Decoder
May 1999
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.
n n n n 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
n n n n n n n Touch tone decoding Precision oscillator Frequency monitoring and control Wide band FSK demodulation Ultrasonic controls Carrier current remote controls Communications paging decoders
Features
n 20 to 1 frequency range with an external resistor n Logic compatible output with 100 mA current sinking capability n Bandwidth adjustable from 0 to 14%
Connection Diagrams
Metal Can Package Dual-In-Line and Small Outline Packages
DS006975-1
Top View Order Number LM567H or LM567CH See NS Package Number H08C
DS006975-2
Top View Order Number LM567CM See NS Package Number M08A Order Number LM567CN See NS Package Number N08E
© 1999 National Semiconductor Corporation
DS006975
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Absolute Maximum Ratings (Note 1)
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 2) V8 V3 V3 Storage Temperature Range 9V 1100 mW 15V −10V V4 + 0.
5V −65˚C to +150˚C
Operating Temperature Range LM567H −55˚C to +125˚C LM567CH, LM567CM, LM567CN 0˚C to +70˚C Soldering Information Dual-In-Line Package Soldering (10 sec.
) 260˚C Small Outline Package Vapor Phase (60 sec.
) 215˚C Infrared (15 sec.
) 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Re...
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