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UCD3138064A: What is the ADC reference voltage

Part Number: UCD3138064A

Hi,

  I saw the options for ADC reference voltage in this TI document.But I did not find relevant descriptions of "Internal ADC Voltage Reference" and "AVDD".  Please tell me what these values are and where are their detailed descriptions?

              

ADCCTRL.ADC_SEL_REF