The data sheets specifies a full scale range of +/-320mV but all the specifications are rated with an input signal of only +/-250mV. Why?
The performance specifications listed in the data sheet are for a +/-250mV input signal. If this input signal range is exceeded, but within the absolute maximum ratings, the AD7403 will continue to operate but the specifications are not guaranteed. So to maintain accuracy it is recommended to keep the input signals into the specified performance range.
The maximum full scale positive input where the modulator will output all 1's is +320mV. The maximum full scale negative input where the modulator will output all 0's is -320mV.
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