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data error of AD9988 ADC output

Category: Hardware
Product Number: AD9988
Software Version: API 1.2.2


The ADC sampling output data of  AD9988 evaluation board has 0.03% probability of  data error, as shown in the figure (the upper is IQ data in time domain, the lower is data in frequency domain after FFT). 

engineers  tried to reduce the rate of serdes, but there is still a 0.03% probability of data error.

what reason can it be?