To sample the input voltage, the SAADC peripheral connects a capacitor to the input.
The acquisition time indicates how long the capacitor is connected, see the TACQ field in the register CH[n].CONFIG. The required acquisition time depends on the source (Rsource) resistance. For high source resistance, the acquisition time should be increased, see Acquisition time.
| TACQ | Maximum source resistance [kΩ] |
|---|---|
| ≤1 | <1 |
| 3 | 10 |
| 5 | 40 |
| 10 | 100 |
| 15 | 200 |
| 20 | 400 |
| 40 | 800 |