CMX631A Low Voltage SPM Detector Features and Applications Detects 12kHz or 16kHz SPM Call Charge Applications on PABX Line Frequencies Cards Tone Follower and Packet Mode Complex and/or Simple Telephone Outputs Systems High Speech-Band Rejection Remote Telephone/Payphones Properties Low Power Operation (2.7V <0.8mA) Brief Description Xtal or clock-pulse input. The CMX631A demonstrates exceptional 12kHz and 16kHz performance in the presence of both voice and specific design requirements. 1998 Consumer Microcircuits Limited (CMX631AD4), and 16-pin PDIP (CMX631AP3). Additional package styles may be available to meet line-powered, is available in the following packages: 24-pin SSOP (CMX631AD5), 16-pin SOIC This system (12kHz/16kHz) selectable integrated circuit, requires a 2.7V to 5.5V power supply which may be logic outputs will be produced a Tone Follower Output and a Packet Mode Output. noise. This device may operate from a single or differential analogue signal input, from which two individual 16kHz frequency limits are accurately defined by the use of an external 3.579545MHz telephone-system the user s national Must/Must-Not Decode specifications via an on-chip input amplifier. The 12kHz and Deriving its input directly from the telephone line, input amplitude/sensitivities are component adjustable to the presence of either 12kHz or 16kHz telephone call-charge frequencies on a telephone line. The CMX631A is a low-power, system-selectable Subscriber Pulse Metering (SPM) detector that indicates Provisional Information D/631A/1 May 1998CONTENTS Features and Applications ..................................................................................................1 Brief Description ..................................................................................................................1 1 Block Diagram ...................................................................................................................3 2 Signal List..........................................................................................................................4 3 External Components .......................................................................................................5 4 General Description ..........................................................................................................6 ........................................................................................................ 6 .................................................................................................................... 6 ............................................................................................................. 7 4.4 WILL/WILL-NOT Detect Frequencies ............................................................................ 9 5 Applications.......................................................................................................................9 5.1 Input Configurations ......................................................................................................... 9 . 9 The Clock-Out Pin 6 Performance Specification.............................................................................................11 ................................................................................................. 6.1.1 Absolute Maximum Ratings 6.1.2 Operating Limits 6.2 Packages ....................................................................................................................... 1998 Consumer Microcircuits Limited 2 D/631A/1 14 12 ..................................................................................................... 6.1.3 Operating Characteristics 11 ................................................................................................................... 11 .................................................................................................. 11 6.1 Electrical Specifications 10 ........................................................................................................................ 10 ............................................................................................................................... 5.1.2 Aliasing ............................................................................................ 5.1.1 Protection Against High Voltages 4.3 Sensitivity Setting 4.2 Packet Mode 4.1 Tone Follower Mode Page Section CMX631A Low Voltage SPM Detector