The internal oscillator of an IDT clock synthesizer is to be used with an external crystal. A particular crystal is to be used and the
compatibility of the crystal drive level with the current provided by the IDT oscillator must be checked in order to avoid violating the maximum power dissipation specification of the crystal. Refer to application note AN-801 for more details on quartz  crystal units specifications, connecting the crystal to the internal oscillator X1 and X2 pins of the IDT clock synthesizer IC, and adjusting the tuning capacitors for the desired output frequency. For other questions not addressed by the Knowledge Base, please submit a technical support request.

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应用指南 &白皮书
AN-801 Crystal-High Drive Level Application Note PDF 109 KB