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Old 26th February 2014, 05:57 PM   #1
ungie is online now ungie  Canada
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Default USB Input Switch

Hi everyone,

I'm in the process of designing a simple USB DAC based on the PCM2707. I would like to be able to have two USB input jacks and switch between them. I could use a 4-pole switch, but I would like something more elegant, maybe a MUX IC along with a push button to control the switching. I'm mainly concerned about using something that will not compromise the data integrity. I'd appreciate any ideas.

Thanks!
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Old 27th February 2014, 09:00 AM   #2
Ryssen is offline Ryssen  Sweden
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Would´nt you managae that with a 1 pole swicth?
You don´t have to switch the +5v and the ground´s
just the data stream.Or am I wrong?
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Old 27th February 2014, 11:16 AM   #3
AAK is offline AAK  United States
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Hi ungie,

If you're worried about signal integrity a high speed relay will do the job.

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I use these relays to switch between two USB inputs and it works great.

Hope the info helps.

Best regards,

Al
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Old 27th February 2014, 11:20 AM   #4
AAK is offline AAK  United States
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Not sure if the link worked. The digikey part number is PB1094-ND.
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Old 27th February 2014, 05:33 PM   #5
ungie is online now ungie  Canada
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Quote:
Originally Posted by AAK View Post
Not sure if the link worked. The digikey part number is PB1094-ND.
Thank you.
Because this is a DPDT relay, I'm assuming you are using two of them in order to switch +V, GND, D+, and D-?
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Old 18th March 2014, 06:18 PM   #6
ungie is online now ungie  Canada
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My understanding is that V+ MUST be switched as well as it is connected to the HOST pin on the PCM2707. You cannot have the V+ supplies from both USB devices connected together, and I suspect that you would not want to have those grounds tied together either. I'm really trying to duplicate the identical behavior of unplugging and plugging in between two devices. I'm surprised there isn't a good chip for this application...probably is but I haven't found it yet.
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