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It is my understanding that you want stable (referenced) step function with hardware ON/OFF. For that I suggest VDAC8 with hardware enable pin. When it is High, the VDAC provides stable voltage (whatever you set e.g. by API VDAC_Write(128)), when it is LOW, VDAC output is 0 V.
Specifically for capacitor characterization it is better to use IDAC8. In this case the voltage increases linearly, which is much easy to analyze and process. For example, you may set voltage comparator at 1.24V and count time it takes between IDAC start and Comparator stop events.