Comments on: USB Isolator.

By: Jared

Jared — Thu, 17 May 2012 05:01:27 +0000

Any recommended AC power supply that fits the power connector?

By: Yang Zhou

Yang Zhou — Fri, 04 May 2012 07:03:11 +0000

Are the 1Mohm necessary? – in this application note: http://www.analog.com/en/circuits-from-the-lab/CN0160/vc.html
it seems that they’ve tied SPD and SPU directly to VDD1 and VDD2 rather than with pull-up resistors.

By: oleg

oleg — Mon, 23 Apr 2012 16:03:10 +0000

For 5 digits this supply is going to be too noisy. You’ll need linear supply here.

By: Zakie Mashiah

Zakie Mashiah — Sun, 22 Apr 2012 18:38:07 +0000

Hi Oleg,
One of the things I am looking to do besides isolation is to have current meter for the peripherals. I want a granular current meter (I want 5 or 6 digits), as the intention is to see power requirements pull off the bus while in the design phase and testing.
If I understand correctly, then I should cut the line leading from the coil to Vbus jumper and measure the current through that cut, right?
Think of this as a feature suggestion too.

By: oleg

oleg — Sat, 24 Mar 2012 14:45:37 +0000

You can do this but you still need to shutdown DC-DC converter as shown in the guide.

By: Alex

Alex — Fri, 23 Mar 2012 18:20:16 +0000

again one question: if I still would feed the vbus and ground through the usb connector from a self powered device (usb/spdif converter), would the dc-dc onboard regulator bypassed by such connection or not? The reason I ask, I can’t solder but I have custom usb connector through which I can connect an extra psu or battery.

By: oleg

oleg — Thu, 22 Mar 2012 17:10:10 +0000

Please refer to the assembly guide – supply bypassing is covered at the very end of the doc -> https://www.circuitsathome.com/adum4160-usb-isolator-assembly-guide

By: Alex

Alex — Thu, 22 Mar 2012 17:06:22 +0000

Dear Oleg,
if I would power the peripheral side through the usb connector do I need to disable (cut) some existing power lines on the board to bypass dc-dc regulator and if yes then where? I plan to connect rechargeable battery block of 4x AA to feed the ADuM periphery.
thank you

By: amzee

amzee — Thu, 22 Mar 2012 08:32:43 +0000

That’s great. Thanks oleg. K

By: oleg

oleg — Wed, 21 Mar 2012 15:47:37 +0000

It would if USB is the only noise path between a PC and a soundcard.