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In Reply to: RE: Also have a question about ADuM4160 isolator posted by kclo on July 25, 2011 at 02:09:05
I've arrowed the jumper in the attached pic. Hope that's clearer.
You can also solder the power lines to the underside of the barrel socket - easier than finding the right barrel plug.
HTH
Dave
Follow Ups:
Thanks for the speedy reply. You do connect AGND to Shdn with a jumper.
However I have another question. According to the USB Isolator web page, the designer only mentioned that the first connection ( Vin to Vbus) and hadn't mentioned the second connection, as in this paragraph here:
"Now, let’s discuss building the circuit. First of all, you need to understand one thing. This circuit is an isolator and consequently has two power rails and two grounds, marked GND and AGND. Don’t connect these two grounds together. Uplink side of ADuM4160 is powered from host USB bus, downlink power has to be provided form separate supply, usually wall wart. If you have 5V wall-wart capable of providing enough power to the USB device connected to the downlink port plus 10ma for isolator itself, you don’t need to build a regulator. Simply connect pad marked “Vin” to a pad marked “Vbus”. If your device is self-powered and have 3.3-5V supply, it can also be used to power downlink side of ADuM4160 by connecting it to “Vbus” pad."
And looking at the wiring diagram, AGND is connected to the input return. Why is it needed to connect to Shdn?
Thanks again for your help.
. . . 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
Just plugged it in. It works as advertized and no problem of any kind.
Without burning in, the sound is already fuller and more liquid than before. Thanks for your help.
Oh, "wire Vin to Vbus, Shdn to Agnd (this will switch off the power supply )", to switch off the power supply. Got it.
Thanks. Will give it a go.
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