ADS1255 / ADS1256 Input Range

The datasheet says the analog input range is + – (Vref * 2) / PGA. In other words, if Vref = +2.5V, PGA = 1, then the input range is +-5V.

Though input range is +-5V, what is measured depends on Vrefp and Vrefn, as described in the overview.

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