ADUM5400 EMI reduction

Hello AD-Team,

I have a card with 4 isolated output ports. Every port uses two ADUM5400 with 8 channels in total. I read AN-0971 and I think I got the point. But to further reduce radiation and noise, I would like to disable the ISO-Power Converter of one of the two ADUM5400 on each port. Is this possible? As far as I understand from the datasheet, the ISO-power converter ist completely independent from the  logic part. So I can power down the ISO-Converter (connect VDD1/pin1 to GND, leave VISO/pin16 open) and power the second IC from the first one.

Is this feasable?

Regards

Falk

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  • Falk:

    I agree that if you don't need the extra power provided by a second isoPower output , then you can use an ADuM1410 powered by one ADuM5400 VISO. You need to connect the 5V supply on the primary side to VDD1 of both ADuM5400 and ADuM1410 (just like you would have needed to connect the 5V supply to the VDD1 of each of the 2 ADuM5400s if you used them).

    Regards, Brian

Reply
  • Falk:

    I agree that if you don't need the extra power provided by a second isoPower output , then you can use an ADuM1410 powered by one ADuM5400 VISO. You need to connect the 5V supply on the primary side to VDD1 of both ADuM5400 and ADuM1410 (just like you would have needed to connect the 5V supply to the VDD1 of each of the 2 ADuM5400s if you used them).

    Regards, Brian

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