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ADS7056: ADS7056EVM issue

Part Number: ADS7056
Other Parts Discussed in Thread: OPA856, , OPA836

Hi Team,

My customer evaluating our ADS7056EVM now, and they found an strange issue, when they input a stable DC voltage on input of ADS7056EVM(input to OPA856 of EVM), then click continue capture data button on our GUI, they get data as below:

they found first 2000 data was higher than input volage, and it drop to right value slowly, sampling rate is 2.5MHz.

Customer use logic analysis equipment to capture SPI line of ADS7056, SPI data is the same with GUI, so we don`t know why this happened, do you have some comments?

Thanks very much.

Regards, Sunny