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Why Vref is set of ADC0848 to 2.56 V if analog input is connected to the LM35?

Why Vref is set of ADC0848 to 2.56 V if analog input is connected to the LM35? Correct Answer to set the step size of the sampled input

Vref is used to set the step size of the ADC conversion, if it is selected to 2.56 then the step size will be selected to 10mV, so for every step increase of the analog voltage an increase of 10 mV will be there.

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