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CML modem IC consumes <5mA

Posted: 07 Feb 2002 ?? ?Print Version ?Bookmark and Share

Keywords:consumer microcircuits? modem ic? modem? communication ic? networking ic?

Consuming <5mA from a single 2.7V supply, the CMX866 V.22bis modem IC from Consumer Microcircuits Ltd is suited for the low-power requirement of line-powered telephone-based applications.

The chip is controlled via AT commands over a 9.6Kbps serial interface compatible with most types of host microcontrollers. An RS232-compatible interface can be created the addition of a level converter.

The on-chip microcontroller interprets the AT commands and controls an internal DSP, which provides the modem and ancillary functions such as ring detection, call progress detection, hook switch control and DTMF auto-dialling. User-specific DSP functions are also available via the AT command set.

The device features hardware support for V.23/Bell 202, V.22/Bell 212A, V.21 and Bell 103 FSK Fast Turnaround operation. A Fast Connect mode is available to reduce modem connection time.

The CMX866 also features a hook switch relay drive output and a ring detector circuit that remain operational when the CMX866 is in zero-power or powersave mode. This mode provides an interrupt signal to wake up the chip or an external host microcontroller when line voltage reversal or ringing is detected.

The 28-pin SSOP/SOIC device also integrates a line driver and receives hybrid circuits, requiring only passive external components to build a 2- or 4-wire line interface.

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