Software-selectable input ranges ±10 V, ±5 V, ±2.5 V, 0 V to +10 V
The ADC contains a 2.5 V internal reference. The AD7321 also allows for external reference operation. If a 3 V reference is applied to the REFIN/OUT pin, the AD7321 can accept a true bipolar ±12 V analog input.