47.6.9.7 Dithering-Interpolation Mode
It is possible to enable both Dithering and Interpolation at the same time by setting DACCTRLx.DITHER and DACCTRLx.OSR prior to enabling the DAC. In Dithering-Interpolation mode, the output of dithering is sampled at a number of events corresponding to the OSR value. The valid OSR value is 2, 4, 8, or 16.