VXCOVoltage-Controlled Crystal Oscillator
VXCOVariable Crystal Oscillator (aka VCO and VXO)
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255+ MHz VXCO output is used either as the clock input for the DDS within the synthesizer, as the digital programmable synthesizer or as the buffer amplifier.
Abbreviations: ADSL Asymmetric Digital Subscriber Line ANSI American National Standards Institute DCXO Digitally Controlled Crystal Oscillator ETSI European Telecommunications Standards Institute ITU International Telecommunications Union LiDrAFE Line Driver and Analog Front End VXCO Voltage Controlled Oscillator