Low Voltage SPM Detector

The CMX631A is a low-power, system-selectable Subscriber Pulse Metering (SPM) detector that indicates the presence of either 12kHz or 16kHz telephone call-charge frequencies on a telephone line. Deriving its input directly from the telephone line, input amplitude/sensitivities are component adjustable to the user's national Must/Must-Not Decode specifications via an on-chip input Amplifier The 12kHz and 16kHz frequency limits are accurately defined by the use of an external 3.579545MHz telephone-system Xtal or clock-pulse input. By Consumer Microcircuits Limited
CMX631A 's PackagesCMX631A 's pdf datasheet

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CMX631A Application circuits
CMX631A circuits
This is one application circuit of CMX631A,If you need more circuits,please download CMX631A's pdf datasheet.

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