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Old 16th October 2005, 07:28 PM   #1
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Join Date: Jun 2004
Location: California, USA
Default 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?
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Old 16th October 2005, 08:01 PM   #2
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Location: California, USA
I notice it isn't grounded on the TI reference board nor the PCM2702 board produced by 00940.
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Old 18th October 2005, 12:56 PM   #3
00940 is offline 00940  Belgium
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Location: Liège
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
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Old 19th January 2007, 11:48 PM   #4
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I'm also interested in what is the proper grounding for the USB connector shield at the receiving end
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Old 20th January 2007, 01:55 PM   #5
guzzler is offline guzzler  Scotland
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Join Date: Feb 2003
Location: Scotland
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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