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ADC output is automatically amplified to full scale

Other Parts Discussed in Thread: ADS61B29

Hi,

I'm using ADS61B29 ADC. I'm feeding 4dBm input so that i'll get -6dBFS. The time domain plot is as follows :

Initially the amplitude is Full scale and then it came down to -6dBFS.  Over range of ADC is not detected.

Please note that there is no change in the analog input given to the ADC. And we got same plot using MATLAB also... What could be the problem? is this anyway related to DRVDD of ADC?

Thanks,

Rakend