Hi Joseph, Thanks for your response, In REF5040 datasheet Low Noise: 3 μVPP/V is given which same for REF5025 as they are in same family. So which Low noise reference IC is mounted on EVM board. In our case , we have made the jumper settings for 2.5V Vref (internal Vref). Is there any chance that we can calculate the actual ENOB when we give some analog input through function generator. As I told you in earlier mail that we are getting SNR on EVM software , But though Data Rate and PGA gain is constant still SNR is changing as Input voltage changes as shown below: Can you tell me what can be the reason for that? Regards, Tejaswini
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