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Build idea, but knowledge limited...

post #1 of 11
3/7/11 at 10:00am
Thread Starter 

I had a neat idea as a small project. I want usb audio output from my computer to a switchable source. Sources should include optical/toslink, RCA (stereo), and coax at 24bit/192khz. What goes into a project like this?

 

In my mind all I know that needs to be there is the chip that changes signals from one source to another....

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post #2 of 11
3/7/11 at 10:32am

You can use a PCM2706 but you will be limited to 16 bit / 48kHz by the chip design

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post #3 of 11
3/7/11 at 10:35am

You could use PCM2704 as well...


Edited by Avro_Arrow - 3/7/11 at 10:36am
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post #4 of 11
3/7/11 at 1:50pm
Thread Starter 

So basically I have to use 16/48 to do this because any higher would require an actual driver to be written? (thats what my research was telling me)

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post #5 of 11
3/7/11 at 1:56pm

So far as I know (which isn't much..), yes.

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post #6 of 11
3/7/11 at 3:57pm

You don't have to write a driver for higher than 16/48, but you do have to either a) write the USB code for something like a TAS1020B or b) get an unobtainium chip

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post #7 of 11
3/7/11 at 5:11pm
Thread Starter 

I found a bunch of 24/192 chips on the TI website, though i have no idea how im supposed to read the data that comes with them. I'm not anywhere near that advance of a level yet.... Chips include PCM1792A, PCM1794A, DSD1792A, DSD1794A.....

 

The pinout is in the sheet provided. what is the next step?

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post #8 of 11
3/7/11 at 5:43pm

Those are not USB  DACs. They won't work for what you want to do.

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post #9 of 11
3/7/11 at 5:58pm
Thread Starter 

What about WM8740/WM8741 ?

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post #10 of 11
3/7/11 at 7:26pm

If you would rather build a project that is already designed than design something yourself, AMBs gamma 2 sounds like it is what you are looking for. It is based on the wolfson 8741 and can have input from usb, optical, or digital coax. It can output to rca, 1/8 inch trs, optical, or digital coax.

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post #11 of 11
3/7/11 at 7:35pm

The Y1 uses a PCM2707 as it's USB reciever...previous limitations still apply.

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