Dual SPM Detector

The MX641 is a low-power, system-selectable Dual Subscriber Pulse Metering (SPM) Detector designed to indicate the presence, on a telephone line, of either 12kHz or 16kHz telephone call-charge frequencies. It is designed for PBX and PABX line-card and remote telephone installations. Under Processor control via a common serial Interface each channel of the MX641 will detect call-charge pulses from a telephone line and provide a digital output for recording, billing or security purposes. A common set of external components and a stable 3.579545MHz Xtal Clock input ensures that the MX641 adheres accurately to most national Must and Must-Not decode band-edges and threshold levels. For non-Processor systems a preset sensitivity/system input allows external channel level and system setting By Consumer Microcircuits Limited
MX641 's PackagesMX641 's pdf datasheet

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MX641 Application circuits
MX641 circuits
This is one application circuit of MX641,If you need more circuits,please download MX641's pdf datasheet.

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