AN10039 TCXO Frequency Stability and Frequency Accuracy Budget

Temperature compensated oscillators (TCXOs) are used for frequency reference in systems that typically require frequency stability of 5 ppm or better. The frequency accuracy in these systems must, in general, be maintained within a timing budget that takes into account frequency drift of the TCXO due to all factors including variations in operating temperature, supply voltage, output load, and aging during the entire system operating lifetime. A set of frequency stability parameters is commonly defined by the industry to quantify the influence of environmental factors and circuit conditions on reference oscillators. This document explains the frequency stability specifications in SiTime TCXO datasheets and how the limits of frequency accuracy are calculated.


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