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AD9633 Measurement

Hi all,


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

But we find out there are some codes will go wrong on some regular voltage with the 80MHz CLK.



(no error In 20 MHz or 40MHz CLK)

(We didn't use the SPI to change any default setting)



In these figures the codes will go wrong on several specific point.

Can anyone give us some suggestion about this measurement?