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RE: Also have a question about ADuM4160 isolator

. . . looking at the wiring diagram, AGND is connected to the input return. Why is it needed to connect to Shdn?

What follows are extracts from the e-mails I exchanged with Oleg Mazurov back in April last year.
If possible, use DACs power supply to power B-side of isolator instead of the supply on isolator board. Also, if USB cable on DAC side is of any length, find out if cable shield is grounded on DAC connector and, if not, ground it on the isolator board ( it is not grounded by default ).

By that, do you mean connecting a clean 5-volt supply to the V-bus pad and its Gnd to the AGnd pad? Currently, I'm using a12v supply via the barrel connector but by-passing the switching regulator with 5v makes sense to me.

Yes, that's why Vbus pad is there. Ground to agnd is optional - you'll get ground return via USB ground wire anyway. There is also Vin pad close to barrel connector which can also be used if you want to use your own power supply - wire Vin to Vbus, Shdn to Agnd (this will switch off the power supply ) and supply 5V via barrel connector.

There are also ways to power B-side from 3.3V - you will need to supply it directly to pin 14.


Hope that's clearer,

Dave

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