DCXODigitally-Compensated Crystal Oscillator
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The Unicorn II chipset is comprised of a digital chip (ST70138) with integrated Discrete Multi-Tone (DMT) engine, USB (Universal Serial Bus) controller and USB Physical-layer interface (PHY), and the MTC20174 which integrates the Analog Front End (AFE), line driver, and Digitally-Controlled Crystal Oscillator (DCXO).
An alternate approach to achieving tight stability is to use a digitally compensated crystal oscillator (DCXO).
To reduce the total BOM, cost and power, the SpeedREACH AFE integrates 14-bit linear converters, a +5V line driver, a line receiver and a digitally controlled crystal oscillator (DCXO), and consumes less than 1W.