The LM567CN is a general purpose tone decoder 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
Touch tone decoding
Frequency monitoring and control
Wide band FSK demodulation
Carrier current remote controls
Communications paging decoders
Datasheet Available:National LM567CN
8 pin DIP. Manufactured by National.