The input voltage range of the ADC depends on the analog voltage supplies (AVDDx and AVSSx), the reference used (Vref), the configured PGA gain and the type of signal connected to the input (single ended, differential, and pseudo-differential).
| Input signal type | Input signal type | AVDD from GND | AVSS FROM GND | Vref from GND | VCM from GND | AINx+ max without limitation | AIN+ min without limitation | AINx- max without limitation | AIN- min without limitation | Absolute maximum Voltage Rail | Absolute Minimum voltage Rail | AIN+ max | AIN+ min | AIN- max | AIN- min | max{(AINx+)-(AINx-)} | min{(AINx+)-(AINx-)} |
| Bipolar Supply | True differential | 2.5 | -2.5 | 4.096 | 0 | 2.048 | -2.048 | 2.048 | -2.048 | 2.5 | -2.5 | 2.048 | -2.048 | 2.048 | -2.048 | 4.096 | -4.096 |
| Pseudo Differential | 2.5 | -2.5 | 4.096 | 0 | 4.096 | -4.096 | 0 | 0 | 2.5 | -2.5 | 2.5 | -2.5 | 0 | 0 | 2.5 | -2.5 | |
| Single ended | 2.5 | -2.5 | 4.096 | - | 1.696 | -2.4 | -2.4 | -2.4 | 2.5 | -2.5 | 1.696 | -2.4 | -2.4 | -2.4 | 4.096 | 0 | |
| Unipolar Supply | True differential | 5 | 0 | 4.096 | 2.048 | 4.096 | 0 | 4.096 | 0 | 5 | 0 | 4.096 | 0 | 4.096 | 0 | 4.096 | -4.096 |
| Pseudo Differential | 5 | 0 | 4.096 | 2.048 | 6.144 | -2.048 | 2.048 | 2.048 | 5 | 0 | 5 | 0 | 2.048 | 2.048 | 2.952 | -2.048 | |
| Single ended | 5 | 0 | 4.096 | - | 4.196 | 0.1 | 0.1 | 0.1 | 5 | 0 | 4.196 | 0.1 | 0.1 | 0.1 | 4.096 | 0 |