Brief Description

The CMX868 is a multi-standard modem for use in telephone based information and telemetry systems. Control of the device is via a simple high speed serial bus, compatible with most types of µC serial interface. The data transmitted and received by the modem is also transferred over the same serial bus. On-chip programmable Tx and Rx USARTs meeting the requirements of V.14 are provided for use with asynchronous data and allow unformatted synchronous data to be received or transmitted as 8-bit words.

Features

· V.22 bis 2400/2400 bps QAM

· V.22, Bell 212A 1200/1200 or 600/600 bps DPSK

· V.23 1200/75, 1200/1200, 75, 1200 bps FSK

· Bell 202 1200/150, 1200/1200, 150, 1200 bps FSK

· V.21 or Bell 103 300/300 bps FSK

· DTMF/Tones Transmit and Receive

· ‘Powersave’ Standby Mode

Applications

· Telephone Telemetry Systems

· Remote Utility Meter Reading

· Security Systems

· Industrial Control Systems

· Electronic Cash Terminals

· Pay-Phones

· Cable TV Set-Top Boxes