LM567 Datasheet (Texas Instruments)

LM567, 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

LM567 Features

* 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 Cent