CMX878 V.22bis Modem plus DAA

The CMX878 is a line-powered V.22bis-based multi-standard modem for use in telephone based information and telemetry systems.
It provides the building blocks for interfacing to the telephone line without the need for a transformer - this is the Data Access Arrangement (DAA) allowing for the coupling of data signals to and from the line; it can also detect Ringing and Line Reversals.
Provision is made for the conditioning and monitoring of other aspects of the telephone line. This includes the gyrator/DC mask, anti-reflective (AR) impedance control, and line voltage measurement.
A complete line interface can be implemented with a small external component count, using low cost components.
Very low power consumption and built-in power management makes the CMX878 suitable for telephone line power usage. Furthermore the microprocessor can be de-powered whilst awaiting the detection of a Ring, Line Reversal, or WAKE pin event.
Control of the device is via a simple high speed serial bus, compatible with most types of μC serial interface.
Data transmitted and received by the modem is transferred over the same serial bus.

For further information, please contact kellyb@spectre-online.co.uk