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AD7450 Transfer Characteristics

Category: Hardware
Product Number: AD7450

Hi Community,

I am little bit confused on how to determine the transfer function of the AD7450 differential ADC. According to figure 5 in datasheet, input voltage range from -Vref+1LSB to +Vref-1LSB, which gives a spawn of 2Vref-2LSB. How is it possible? I was attending something like 2Vref-1LSB. What will be the mathematical equation related Data code to differential input voltage?