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