AD7960 Acquisition Problem.  Missing Codes

Hello Community,

I am trying to evaluate the AD7960. We have designed a dedicated board for testing the device on the ATE system. We have to extract all static and dynamic parameters. The stimulis are a sinus or a ramp generating by AWG 24bits.

But something wrong. Codes is missing. and I don't understand why. I verified all the ATE system. The algorithm to compute the data is certified.

Here is my setup:

E0 to E3: 1001

2.048V to REFIN

Convertion rate: 4MSPS

Any Hints on what is going on would be welcome.

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