SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7
The Reference DAC requires bias current from the Low Power Mode Bias (LPMBIAS) module when:
Set AUX_ANAIF:LPMBIASCTL.EN to enable the LPM Bias module, then set AUX_ANAIF:DACCTL.DAC_EN to enable the Reference DAC.