we are working ADAS3022EDZ Eval board to communicate SPI through Arduino board. please help me
As previously requested we will need additional information regarding how you've modified the evaluation board to connect your controller, the code you are currently using and any physical result data you can share to help us diagnose you problem.
As you are using the internal reference have you verified that the REFIN and REF voltages are powered up and fully settled to their specified values?
In fact could you please check that all supply rails are correctly powered? This will ensure we're not fighting a supply issue. I'll go back and look at the code snippet and waveforms you provided earlier to see if I can't come up with additional suggestions.
Did you intend to use the device in the four-(4) differential pair configuration or were you expecting to read channels 0 -7 with respect to COM? If it's the latter you'll want to modify your configuration word to set CFG to 1'b1.
Please also share how you are validating the results of the ADC with respect to your applied input voltage. Please note the inputs must be driven and cannot float.