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The ADC output is showing a peak for the DC input

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vs10

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Hi
I am trying to use an Analog to digital converter. After making all the connections, as per the data sheet, I am given a DC at its input. When I am taking the output of ADC into the computer through the data acquisition card, the 14 digit output is not constant, it very shaky and I am getting a peak in the output. This peak brings the output to zero instantaneously. Please help..

Please see attached the graph. This is the output of the ADC after taking in to the computer. I am giving the DC input around -0.8 V.
The result is shaky and their is a big peak in the final output. The VRef of ADC is +/- 2.5V.
 

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