AN303 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

AN303

Si55X VCXO TEMPERATURE STABILITY DEFINITION

Silicon Laboratories 

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 crystal’s temperature stability and aging stability.

4. Conclusion

Silicon Labs’ 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 crystal’s temperature stability and the crystal’s aging

stability.

Rev. 0.1

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