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

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Anonymous
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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

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