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LMC567NSN/a1737avaiLow Power Tone Decoder


LMC567 ,Low Power Tone DecoderLMC567LowPowerToneDecoderFebruary1995LMC567LowPowerToneDecoderGeneralDescription
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LMC567
Low Power Tone Decoder
TL/H/8670
LMC567
Low
Power
Tone
Decoder
February 1995
LMC567 Low Power Tone Decoder
General Description
The LMC567isalow power general purpose LMCMOSTM
tone decoder whichis functionally similartothe industry
standard LM567.It consistsofa twice frequency voltage-
controlled oscillator (VCO) and quadrature dividers which
establishthe reference signalsfor phaseand amplitudede-
tectors. The phase detectorand VCO forma phase-locked
loop (PLL) which lockstoan input signal frequency whichis
withinthe control rangeofthe VCO.WhenthePLLis locked
andthe input signal amplitude exceedsan internally pre-set
threshold,a switchto groundis activatedonthe outputpin.
External componentssetup theoscillatortorunat twicethe
input frequencyand determinethe phaseand amplitudefil-
ter time constants.
LMCMOSTMisa trademarkof National SemiconductorCorp.
Features Functionally similarto LM5672Vto9V supply voltage range Low supply current drainNo increasein current with output activated Operatesto500kHz input frequency High oscillator stability Ground-referenced input Hysteresis addedto amplitude comparator Out-of-band signalsand noise rejected20mA output current capability
Block Diagram (withExternal Components)
TL/H/8670–1
Order Number LMC567CMor LMC567CN
SeeNS Package Number M08Aor N08E
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
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