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LMC567CN Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LMC567CN Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 7 page  LMC567 Low Power Tone Decoder General Description 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 ampli- tude detectors. The phase detector and VCO form a phase-locked loop (PLL) which locks to an input signal fre- quency 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. Features n Functionally similar to LM567 n 2V to 9V supply voltage range n Low supply current drain n No increase in current with output activated n Operates to 500 kHz input frequency n High oscillator stability n Ground-referenced input n Hysteresis added to amplitude comparator n Out-of-band signals and noise rejected n 20 mA output current capability Block Diagram (with External Components) LMCMOS™ is a trademark of National Semiconductor Corp. DS008670-1 Order Number LMC567CM or LMC567CN See NS Package Number M08A or N08E June 1999 © 1999 National Semiconductor Corporation DS008670 www.national.com |
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