Basically, no current flows in this D/A converter.
This D/A converter consists of an R-2R resistor ladder.
Therefore, the internal resistor is about 5.3kΩ as standard, and the resistor is connected in series with the AVref1 impedance.
Therefore, the level changes sharply when current is applied, resulting in lower accuracy.
It is not recommended to let current flow through the D/A output.
It is necessary to receive the signal with a high impedance of about 10MΩ.
(Refer to description of overall error conditions in the Data Sheet.)