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AD7674 / Single/Differential  Ended Configuration

For Differential circuit as shown below , datasheet says

" When provided an input signal of 0 to VREF, this configuration produces a differential
±VREF with midscale at VREF/2

For following configuration and different Analog input ranging from 0 to 4.096V as below:

1) Analog input 0V --> ADC count ?

2) Analog input 2.048V (Vref/2)  --> ADC count ?

3) Analog input 4.096V (Vref)  --> ADC count ?

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