Technical Documentation - 2016-08-30 18:30:12.318779
This document explain the additive phase noise due to quantization noise in a theoretically way. Moreover, it provides phase noise values using the default mounted DAC (AD5662, 16 bits), taking into account also the voltage noise due to the DAC output stage. The result of the calculation is that AD5662 is still fine for cheap, AT-cut, voltage controlled crystal oscillators (VCXOs). In order to optimally control an OCXO with SC-cut crystal, a DAC resolution of 20+ bits is recommended.