V.32bis modem IC

5 November 2003 Telecoms, Datacoms, Wireless, IoT

The CMX869, a V.32bis modem IC from CML, is targeted at communications terminals which do not need V.90 data rates or have low-power requirements which preclude high-speed operation. The maximum speed of 14,4 Kbps meets the requirements of many mid-range applications, while the low operating and standby currents are attractive for battery powered terminals. The ring/line reversal detection circuit is operational in the standby mode further conserving power. A relay drive output is available. The interface to the host controller is a 'C-BUS' serial link running at 150 Kbps. V.42 is supported by the provision of HDLC (programming option) to generate frames and CRCs, and to detect transmission errors. The CMX869 can transmit and detect standard DTMF and modem calling/answering signals or user-programmed single or dual tone signals. Flexible line-driver and receive hybrid circuits are integrated on-chip, requiring only passive external components to build a 2- or 4-wire line interface.

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