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AD9635 - Minimum clock rate


I am evaluating AD9635 thanks to AD9645-125EBZ + HSC-ADC-EVALCZ.

Test need is to inject a clock at a frequency of 12,5 MHz at J602 input (P601 is removed).

Using VisualAnalog software in FFT mode, I am not able to measure any signal when the input clock rate is below 12,9 MHz. The graphical is frozen and the software seems not able to perform the FFT.

Could you provide any help on this topic?

Thanks and regards,