LM567 Tone Decoder IC - Frequency Selective Trigger for Audio Applications

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

• Package - DIP(8)

 Applications

• Touch Tone Decoding

• Precision Oscillator

• Frequency Monitoring and Control

• Wide Band FSK Demodulation

• Ultrasonic Controls

• Carrier Current Remote Controls

• Communications Paging Decoders

 Description

 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.