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TIDM-02010: ADC Count

Part Number: TIDM-02010
Other Parts Discussed in Thread: TMS320F280025C

Hi Sir, 

While testing ADC for a corresponding voltage of 2.5 V the counts should be 3103 but i am able to read 3067.

The ADC test is performed using reference design of TIDM-02010 on TMS320F280025C launchpad

There is a variation of 100 counts in some cases. 

Can i know the reason? is this variation acceptable.