LM567C

Contents

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

• Touch tone decoding
• Precision oscillator
• Frequency monitoring and control
• Wide band FSK demodulation
• Ultrasonic controls
• Carrier current remote controls
• Communications paging decoders