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 Capability
  • 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

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