LM567CN Datasheet

Telephone Ringers Tone Decoder


The LM567CN is 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. LM567CN 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 Center Frequency• Center Frequency Adjustable from 0.01 Hz to 500 kHz LM567CN Applications • Touch Tone Decoding• Precision Oscillator• Frequency Monitoring and Control• Wide Band FSK Demodulation• Ultrasonic Controls• Carrier Current Remote Controls• Communications Paging Decoders


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