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Hello ,

  I want to use ADuM4122 to switch loads or make shorts to GND or battery -- steady state not constant frequency--, but my question is if it can handle DC input at pin3;   

I have simulated and it seems it works, so what is behind the ADuM to be able to handle DC input - as it seems it uses "transformers" inside and it suppose to handle only AC inputs -- i.e  square control signals  of certain frequency