Choosing a crystal with the correct characteristics is one of the most critical steps in using a Voltage Controlled Crystal Oscillator (VCXO). The crystal parameters affect the tuning range and accuracy of a VCXO. Using the tables and figures below to calculate the TPR and APR of the VCXO using the example crystal parameters. Refer to application note AN-848 for more details. For other questions not addressed by the Knowledge Base, please submit a technical support request.