LM567C Tone Decoder | TI.com

LM567C (ACTIVE) Tone Decoder

Tone Decoder - LM567C


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


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Part number Order Operating temperature range (C) Package Group
LM567C Order now 0 to 70     PDIP | 8
SOIC | 8