Product category:
Communications ICs (Wired)
News Release from: CML Microcircuits | Subject: CMX868A
Edited by the Electronicstalk Editorial
Team on 12 January 2006
Upgrade for multistandard modem IC
The CMX868A is a newly revised multistandard modem IC targeted at telemetry and telephone based information applications.
A member of CML's wireline modem family, the CMX868A is a newly revised multistandard modem IC targeted at telemetry and telephone based information applications Operations such as remote utility-meter reading, set-top boxes, electronic cash terminals and advanced payphones are but a few of the CMX868A's target applications
This article was originally published on Electronicstalk on 11 Feb 2004 at 8.00am (UK)
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Compliant with ITU and Bell recommendations, the CMX868A is fully backward compatible with the well-known CMX868, allowing existing users to re-use their current software and hardware designs.
In addition, the CMX868A boasts an enhanced DTMF codec that, while giving greater compatibility with Global exchanges and third party DTMF encoders, also offers excellent immunity to falsing on voice; another beneficial revision that greatly increases the applications to which this advanced modem IC is suited.
Control and data transfer on the CMX868A is via a simple high-speed serial bus, compatible with standard microcontroller interfaces.
Data transfer is conveniently handled by user-selected 8bit bytes or 16bit words via on-chip, programmable Tx and Rx USARTs.
Supported formats are either transparent synchronous data or multi-format asynchronous data compatible with the ITU V.14 recommendation.
Flexible line drivers and a receiver hybrid are integrated on-chip, requiring only passive external components to operate in a two- or four-wire circuit.
The device features a ringing signal/line reversal detector that continues to function when the device is in its Powersave mode, providing an interrupt which can be used to wake-up the host controller when these signals are detected.
A hookswitch/relay drive output, software gain controls and DTMF transmit twist compensation complete the DAA controller.
The CMX868A is an ultra-low-voltage capable device, operating from a single 2.7 to 5.5V supply and is available in 24-pin TSSOP, SOIC and DIP packages.
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