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

      Hi,

          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."

      and

      "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?

       

      Thanks,

            Aaron