LMC567 - National Semiconductor

LMC567 Low Power Tone Decoder

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.

Features

n n n n n n n n n n Functionally similar to LM567 2V to 9V supply voltage range Low supply current drain No increase in current with output activated Operates to 500 kHz input frequency High oscillator stability Ground-referenced input Hysteresis added to amplitude comparator Out-of-band signals and noise rejected 20 mA output current capability Block Diagram (with External Components) DS008670-1 Order Number LMC567CM or LMC567CN See NS Package Number M08A or N08E LMCMOS™ is a trademark of National Semiconductor Corp. © 1999 National Semiconductor Corporation DS008670 www.national.com .