Product category: Communications ICs (Wired)
News Release from: CML Microcircuits | Subject: CMX865
Edited by the Electronicstalk Editorial Team on 12 December 2005
Modem IC offers multistandard signalling
The CMX865 DTMF codec and FSK modem IC offers multistandard signalling capabilities for use in telemetry and telephone based information systems
The DTMF codec offers outstanding 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 article was originally published on Electronicstalk on 12 December 2005 at 8.00am (UK)
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The CMX865 is compatible with either two- or four-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 nonlinearities in the DAA.
All timing, datarates, digital operations and signalling frequencies are sourced from a stable selectable 11.0592 or 12.288MHz on-chip oscillator employing a single crystal or external clock input.
Features include, asynchronous and synchronous data modes with V.14 support, versatile telephone signalling facilities (DTMF and tones), independent Rx and Tx USART functions, three-state Tx line drive, ring and line reversal detector, hook-switch output and C-Bus serial interface.
Selectable modem standards and datarates are: V.23 (1200/75, 1200/1200, 75, 1200bit/s) FSK, Bell 202 (1200/150, 1200/1200, 150, 1200bit/s) FSK, Bell 103 (300/300bit/s) FSK.
The CMX865 is available in a compact 24-pin plastic SOIC package, and operates in the 3.0 to 3.6V range with facilities for power saving and multiple wake-up modes.
The 100,000-piece OEM guide price is US $1.19.
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