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-   -   USB jac grounding and USB measurement (http://www.diyaudio.com/forums/digital-source/66109-usb-jac-grounding-usb-measurement.html)

Evan Shultz 16th October 2005 07:28 PM

USB jac grounding and USB measurement
 
Hi guys.

I have made a USB DAC using the TI PCM2702 IC with great results. However, I haven't ever grounded the shield, just the ground pin. In case I am not being clear, I have the the mounting tabs of the USB jack floating. Should it be grounded? Or perhaps grounded through a bead? Thank you.

While I'm on the subject, does anyone have ideas of how to get measurement signals, specifically an Audio Precision output, in USB format so I can measure the DAC's performance?

Evan Shultz 16th October 2005 08:01 PM

I notice it isn't grounded on the TI reference board nor the PCM2702 board produced by 00940.

00940 18th October 2005 12:56 PM

Quote:

Originally posted by Evan Shultz
I notice it isn't grounded on the TI reference board nor the PCM2702 board produced by 00940.
To be honnest with you, there's only one reason for that : it wasn't grounded in the Eagle's library ;)

fluckscapacitor 19th January 2007 11:48 PM

I'm also interested in what is the proper grounding for the USB connector shield at the receiving end

guzzler 20th January 2007 01:55 PM

It's not really necessary from an electrical point of view, but it is much better mechanically as there is quite a lot of force involved in removing/inserting the USB plug. I've got modified Eagle libraries with this done. Please EMAIL if you'd like a copy.


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