CMX631A Datasheet | Consumer Microcircuits Limited

Features and Applications - Detects 12k Hz or 16k Hz SPM Frequencies - Tone Follower and Packet Mode Outputs - High Speech-Band Rejection Properties - Low Power Operation (2.7V <0.8m A) - Call Charge Applications on PABX Line Cards - plex and/or Simple Telephone Systems - Remote Telephone/Payphones Brief Description The CMX631A is a low-power, system-selectable Subscriber Pulse Metering (SPM) detector that indicates the presence of either 12k Hz or 16k Hz telephone call-charge frequencies on a telephone line. Deriving its input directly from the telephone line, input amplitude/sensitivities are ponent adjustable to the user's national ‘Must/Must-Not Decode’ specifications via an on-chip input amplifier. The 12k Hz and 16k Hz frequency limits are accurately defined by the use of an external 3.579545MHz telephone-system Xtal or clock-pulse input. The CMX631A demonstrates exceptional 12k Hz and 16k Hz performance in the presence of both voice and noise. This device may operate from a single or differential analogue signal input, from which two individual logic outputs will be produced; a Tone Follower Output and a Packet Mode Output. This system (12k Hz/16k Hz) selectable integrated circuit, requires a 2.7V to 5.5V power supply which may be line-powered, is available in the following packages: 24-pin SSOP (CMX631AD5), 16-pin SOIC (CMX631AD4), and 16-pin PDIP (CMX631AP3). Additional package styles may be available to meet specific design requirements. © 1998 Consumer Microcircuits Limited .. Low Voltage SPM Detector CONTENTS Section Page Features and Applications 1 Brief Description 1 1 Block Diagram 3 2 Signal List...