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AD7794 Bias AIN4


I have a question regarding the AD7794-B. The 400nA/V Typ input bias current in ref 1 is too high for my application.

This is why I had the idea to use AIN4 as my reference input (REF2), as this is an analog input channel and only has 1nA/V Typ in Buffered Mode, according to the data sheet.

My question is: if I use AIN4 as a reference input, does it really have 1nA/V Typ (Analog Input Current) or does it count as an Reference Input and also have 400nA/V Typ.