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Modem IC includes DTMF decoder

Posted: 05 May 2006     Print Version  Bookmark and Share

Keywords:modem IC  telephone based information systems  DTMF decoder  CMX867A  CML Microcircuits 

CML Microcircuits has introduced a new member to its wireline modem IC family. The CMX867A is a newly enhanced V.22 multi-standard modem IC, specifically targeted at telephone-based information systems.

According to the press release, the key feature of the CMX867A is the inclusion of a high-quality DTMF decoder, offering excellent immunity to falsing on voice, which greatly increases the applications to which this advanced modem IC is suited.

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 hook-switch/relay-drive output, software gain controls and DTMF transmit twist compensation complete the DAA controller. Flexible line-drivers and a receiver hybrid are integrated on-chip, requiring only passive external components to operate in a 2-wire or 4-wire line interface.

Compliant with ITU and Bell recommendations, the CMX867A is fully backward compatible with the CMX867, allowing existing users to re-use their current software and hardware designs.

Control and data transfer on the CMX867A is via a 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 ITU V.14 recommendations.

The CMX867A is an ultra-low-voltage device, operating from a single 2.7V to 5.5V supply. This product is available in 24-pin TSSOP, SOIC and DIP packages. The guide price for this product is Rs.111.88 ($2.50).

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