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| AN303 Datasheet, PDF (3/4 Pages) Silicon Laboratories – Si55X VCXO TEMPERATURE STABILITY DEFINITION | |||
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AN303
3. Absolute Pull Range
Correct understanding the temperature dependencies of the Si55x VCXO allow calculation of the absolute pull
range (APR). AN266 describes this calculation in full detail when taking the total pull-range from the minimum
guaranteed Kv; the minimum APR is calculated by taking the minimum pull-range (minimum VC range times the
minimum Kv) and subtracting the crystalâs temperature stability and aging stability.
4. Conclusion
Silicon Labsâ Si55x VCXOs have two temperature dependencies that are specified independently within the data
sheets. The first dependency is due to the crystal behavior and is specified as temperature stability. The second
dependency is due to the VC analog-to-digital converter and is specified as Kv range. Measurement of the crystal
behavior can only be observed if the VCADC is made inactive (i.e., VC = 0.0 V). The resulting APR can be
calculated by taking the minimum Kv and subtracting the crystalâs temperature stability and the crystalâs aging
stability.
Rev. 0.1
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