National Semiconductor LMC567 Low Power Tone Decoder handbook

Update: 28 September, 2023

The LMC567 is a low power general purpose LMCMOS™ tone decoder which is functionally similar to the industry standard LM567. It consists of a twice frequency voltage-controlled oscillator (VCO) and quadrature dividers which establish the reference signals for phase and amplitude detectors. The phase detector and VCO form a phase-locked loop (PLL) which locks to an input signal frequency which is within the control range of the VCO. When the PLL is locked and the input signal amplitude exceeds an internally pre-set threshold, a switch to ground is activated on the output pin. External components set up the oscillator to run at twice the input frequency and determine the phase and amplitude filter time constants.

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Brand: National

File format: PDF

Size: 170 KB

MD5 Checksum: 5C9B0A69A9A27057E04BDE7CF423C1B0

Publication date: 06 July, 2012

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PDF Link: National Semiconductor LMC567 Low Power Tone Decoder handbook PDF