For the AD4130-8 ADC, I am looking for guidance on the relationship of Vref to the device supply voltages AVDD and AVSS.
From the datasheet it is not clear about this relationship, I have seen one configuration where an external 3.3V voltage reference output is connected to both AVDD and to REFIN+. Is this a valid configuration? Can you expand on the limitations of Vref vs AVDD?
Also, what is the relationship with the 1.8V Analog LDO?