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AD74413R error margin in voltage input mode

Hello,

I configured the AD-SWIO 2 Click Channel A as voltage input, I've put 5V as voltage input between the screw terminals. When I read data from the READ_SELECT register, and apply the equation on the datasheet page 34, the result is around 4.6V, is this normal? how to get more accurate data?

Thank you. 

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