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AD9633 Measurement in different frequency

Hi all,

We bought an AD9633 80MSPS and make a PCB to do the measurement.

We get the correct output data codes when the CLK are work in 20MHz, 30MHz, 40MHz, and 80MHz.

But we find out there are some codes going wrong on 65MHz and 50MHz.

After checking the codes,

It's seem like FCO has some unreasonable delay in several time.

Sometimes the DCO and data out are delay at the same time.

But sometimes only FCO has delay.

We didn't use the SPI to change any default setting and doing power off and on every time before every measurement.

Can anyone give us some suggestion about this measurement?

Thank you.

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