DTMF Codec/FSK modem combo chip

Telecoms, Datacoms, Wireless, IoT

Microwave semiconductor & tube suppliers

Radio system suppliers

RF module & subsystem suppliers

Telephony IC suppliers

Wireless system IC/module suppliers

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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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Telecoms, Datacoms, Wireless, IoT

DTMF Codec/FSK modem combo chip

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