Tone Decoder



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.


  • 20 to 1 Frequency Range With an External Resistor
  • Logic Compatible Output With 100-mA Current Sinking
  • 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

View more

Related end equipment

  • Touch Tone Decoding
  • Precision Oscillator
  • Frequency Monitoring and Control
  • Wide Band FSK Demodulation
  • Ultrasonic Controls
  • Carrier Current Remote Controls
  • Communications Paging Decoders

All trademarks are the property of their respective owners.