DTMF Codec/FSK modem combo chip

25 January 2006 Telecoms, Datacoms, Wireless, IoT

The CMX865 DTMF codec and FSK modem IC from CML offers multistandard signalling capabilities for use in telemetry and telephone-based information systems. The DTMF codec offers superior immunity to falsing on voice and is coupled with a high performance V.23 FSK modem.

The CMX865 offers a versatile and reliable solution to designers of quality SMS phones, security alarm panels, automated calling systems, fixed wireless terminals/wireless local loops, remote vending operations and industrial control systems.

This device is compatible with either 2-wire or 4-wire telephone installations, providing a ringing/line reversal signal detector input and a relay drive output. A full set of standard DTMF tones and signalling tones is available. These include modem call and answer tones and call-progress tones. Alternatively, encode and decode signalling functions can be software-configured to generate and decode user-specific single and dual-tone signals.

The CMX865 also has the added benefit of programmable 'twist' on DTMF Tx, to compensate for non-linearities in the DAA. All timing, data rates, digital operations and signalling frequencies are sourced from a stable selectable 11,0592 or 12,288 MHz on-chip oscillator employing a single Xtal or external clock input.

The CMX865 comes in a 24-pin plastic SOIC package and operates in the 3 to 3,6 V range.

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