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INA 220 ADC power supply source

Part Number: INA220

INA220 has an ADC block to receive the shunt voltage drop for current measurement 

Kindly clarify the following:

What is the power source for this ADC ?    3.3 V  or Bus voltage ?    

Does this power source variation affect ADC accuracy ?

Does the variation in ambient temperature affects the ADC performance / current measurement accuracy?

                                                     IC block diagram