USB jac grounding and USB measurement

Evan Shultz · 16th October 2005, 07:28 PM

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.

16th October 2005, 07:28 PM	#1
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	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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16th October 2005, 08:01 PM	#2
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	I notice it isn't grounded on the TI reference board nor the PCM2702 board produced by 00940.

19th January 2007, 11:48 PM	#4
fluckscapacitor diyAudio Member Join Date: Jul 2005	I'm also interested in what is the proper grounding for the USB connector shield at the receiving end

20th January 2007, 01:55 PM	#5
guzzler diyAudio Member 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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