CMX644AD2 - V.22 and Bell 212A Modem - CML Microcircuits
The CMX644A V.22 modem is intended for use in any telephone based information and telemetry system with
low power requirements. Using V.22 signalling, fast call set up times and robust error resistant transmission
can be implemented by efficient low power circuits. The circuit can operate at 1200b/s full duplex over 2-or 4-
wire circuits. Control of the device is via a simple high speed serial bus and data may be optionally formatted
by the on-chip UART. This allows easy interfacing to a host µController. The data transmitted and received
by the modem is also transferred over the same high speed serial bus. In addition to V.22, support is included
to meet the Bell 212A standard. The integrated DTMF encoder can be used as part of the dial out function.
All 16 DTMF combinations are available along with a single tone ‘melody’ mode.
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