1 Reply Latest reply on Nov 2, 2015 7:55 AM by userc_22169 Branched to a new discussion.

    Selection of ADC reference as bandgap vs. Vref, and voltage value of bandgap reference


          I am trying to use the ADC but I need to understand how to adjust the reference for the ADC.


      I see in the BCM20736 Data Sheet (20736-DS-102-R) on Page 13:

      "• There is a built-in reference with supply- or bandgap-based reference modes."


      "Directed by the firmware, the digital hardware also controls the input multiplexers that select the ADC input signal Vinp and the ADC reference signals Vref."


      #1  What is the value of the default voltage reference?


      #2  How do I choose in firmware the ADC reference between bandgap and Vref?