DUAL SPM/SECURITY DETECTOR/GENERATOR

The CMX641A is a low power, system selectable Dual Subscriber Pulse Metering (SPM) Detector two detectors on a single chip to indicate the presence on a telephone line of either 12kHz or 16kHz telephone call charge frequencies. The detection sensitivity, frequency and bandwidth are independently selectable for each channel, under C control, as is the frequency of the security Tone generator, which may be ASK modulated by an external signal. The CMX641A is also backwards compatible with the FX641 and MX641 dual SPM detectors, whilst offering a lower (3.0V) operating voltage and power. By Consumer Microcircuits Limited
CMX641A 's PackagesCMX641A 's pdf datasheet



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CMX641A Application circuits
CMX641A circuits
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