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TMS320F280049: Calculating overall ADC accuracy tolerance based on data from datasheet

Part Number: TMS320F280049

Hi expert,

We have below data provided in datasheet. We'd like to know how to calculate theoretical ADC accuracy based on this?

Should we calculate like this sqrt(5*5+5*5+1*1+2*2) or in some other way?

We'd also like to know why we need to do calculation like this.

Thanks

Sheldon