Search FAQs on the left to see if your question has been answered. Click on the dropdown to view all of the documents associated with the product. If you can't find your question, click on Ask a Question.
What should we do with the unused inputs?
I assume you refer to the analog inputs. Connect then to a known voltage within the input range - such as ground. As a general rule, for any ADC with multiplexed inputs, do not leave any inputs floating. If inputs are left floating, this can cause charge injection to the substrate and degrade the performance of the ADC as a whole.