Acquisition time

To sample the input voltage, the ADC connects a capacitor to the input.

The acquisition time indicates how long the capacitor is connected, see TACQ field in register CH[n].CONFIG (n=0..7). The required acquisition time depends on the source (R_source) resistance. For high source resistance, the acquisition time should be increased. See the following table for more information.

Figure 6. Simplified ADC sample network

Table 2. Acquisition time
TACQ [µs]	Maximum source resistance [kOhm]
3	10
5	40
10	100
15	200
20	400
40	800

When using VDDHDIV5 as input, the acquisition time needs to be 10 µs or higher.