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Why for the 8 bit analog input we select Vref as the 2.56V?

Why for the 8 bit analog input we select Vref as the 2.56V? Correct Answer to obtain each degree count as the 10mV

For an 8 bit analog input, each degree count is calculated as the Vref/256, so if Vref is selected as 2.56V then we can obtain 10mV for each degree count of the scale.

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