CMX631AD5

Low Voltage SPM Detector

The CMX631A is a low-power, system-selectable Subscriber Pulse Metering SPM detector that indicates the presence of both 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.

The CMX631A demonstrates exceptional 12kHz and 16kHz performance in the presence of both voice and noise. This device may operate from a single or differential analog signal input, from which two individual logic outputs will be produced; a Tone Follower Output or a Packet Mode Output.

Features

• Detects 12kHz or 16kHz SPM Frequencies

• Tone Follower and Packet Mode Outputs

• High Speech-Band Rejection Properties

• Low Power Operation 3.0V < 0.8mA

Applications

• Call Charge Applications on PABX Line Cards

• Complex and/or Simple telephone Systems

• Remote Telephone/Payphones