Unused analog input pin connection

Document created by analog-archivist Employee on Feb 23, 2016
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My signal is single ended signal, how do I connect the negative analog input


The ADC and DAC pins of a Sigma Delta analog port have Common Mode voltage.
These pins should never be tied directly to GND; increased current consumption
and reduced performance will result. In the case where a single ended source is
the only option, the unused ADC pins should be AC coupled to GND, not tied