digital controlled crystal oscillator (DCXO)

Digital Controlled Crystal Oscillator (DCXO) is a digitally controlled crystal oscillator with much better characteristics compared to the Voltage Controlled Crystal Oscillator(VCXO). While in the VCXO the frequency is controlled with an analogvoltage, in the DCXO this is done purely digitally, by changing some bits. The frequency change is achieved by switching capacitances on and off. As far as the characteristic values of DCXOs are concerned, their high frequencyaccuracy should be emphasized, as well as their linearity and frequency variation or drawing capability. The linearity is less than 0.01%, which is 1,000 times higher than that of Voltage Controlled Crystal Oscillators (VCXO), frequency resolution is 1 ppb (parts per trillion) and below, and the pull range for DCXOs is from about +/-20 ppm (parts per million) to well over +/-1,000 ppm. Digitally controlled crystal oscillators are supplied in compact packages using SMT technology for surface mounting. They are available for various operating voltages. They can be used wherever the highest frequency accuracy is required, such as in telecommunications components, WLANs, video

Englisch:	digital controlled crystal oscillator - DCXO
Updated at:	19.10.2013
#Words:	169
Links:	crystal oscillator (XO), voltage controlled crystal oscillator (VCXO), frequency (f), analog, voltage
Translations:	DE
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