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I need a simple circuit to convert ADum5241 iCoupler isolator I/O to 3.3 volt levels

I have used the ADum5241 iCoupler before but you need to run it from 5 volts in order to get it to work properly (can't use 3.3 volts).  The IC is nice and small which is great but interfacing it to 3.3 volt logic on the VDD side ends up taking way more PCB area then the isolator does.  I'm currently using 2 SN74LV1T34 level shifters and wonder if any one has any clever ideas that would take up less real estate?

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  • John:  We have a newer isoPower digital isolator that can run from 3.3V VDD on side 1 and 3.3V on the isolated side.  It is called the ADuM5211 and comes in the 20 lead SSOP package, which is smaller than the other isoPower devices that come in the 16 pin wide body SOIC. This package is a little larger than the 8 pin SOIC you are using, but If you can use 3.3V on the isolated side this would save adding the level translators.

    Regards, Brian

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  • John:  We have a newer isoPower digital isolator that can run from 3.3V VDD on side 1 and 3.3V on the isolated side.  It is called the ADuM5211 and comes in the 20 lead SSOP package, which is smaller than the other isoPower devices that come in the 16 pin wide body SOIC. This package is a little larger than the 8 pin SOIC you are using, but If you can use 3.3V on the isolated side this would save adding the level translators.

    Regards, Brian

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