I designed my custom board with stm32f373c8. SDADC runs properly when voltage reference is setted with Vref or VDDA. But when voltage reference is setted with internal 1.8 volt or internal 1.2 , sdadc could't start. It waited while loop that commented "Wait end of stabilization" in stm3f3xx_hal_sdadc.c . And sdadc couldn't stabiliza.