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VDDA / VDDB isolation

Question asked by jappleton on May 20, 2015
Latest reply on May 20, 2015 by RSchnell

Hello,

 

I'm looking at isolated drivers like ADuM7223 or ADuM3220 and I understand that the input side VIA/VIB/VDD1 side is isolated from the output VOA/VOB. However, is there any isolation between the output drive VDDA and VOA (or VDDB and VOB)?

 

It looks as if there is not, but does that mean that there could be some unwanted coupling between VOA and VOB if, say VDDA and VDDB are sourced from a common power supply? The solution may be separate isolators for VDDA and VDDB before they enter the driver, but that adds to my component count.

 

Thanks

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