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Old 6th September 2016, 02:28 PM   #1
bguy is offline bguy  Hong Kong
diyAudio Member
Join Date: Jun 2008
Default Tracing Xmos data lines

Hi All,

I have a cheap Chinese USB dac with Xmos chip and AK4490EQ, I would like to modify it to act as a USB->Spdif converter, did someone tried something like this before?
What do I need to look for? where to start? and how to do it?
I know it's a long shot....but maybe someone can figure it out.
I'll appreciate any help from you.
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Old 6th September 2016, 02:44 PM   #2
sangram is offline sangram  India
diyAudio Member
Join Date: Sep 2002
Location: India
1. Desolder the 33R I2S resistors

2. Get a WM8804 I2S -> SPDIF board (usually available as Raspberry Pi digital output boards)

3. Solder three wires (plus a few ground lines) from the exposed pads to the second board.

You need the three lines towards the board edge. The fourth trace is MCLK, which is not needed for the WM8804. You can work out which is which from the 4490 datasheet. The one closest to the dot is BCK. On the 8804 board you'll have to take a look at the Pi datasheet and you should be able to see which pin is which.
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Old 6th September 2016, 03:06 PM   #3
bguy is offline bguy  Hong Kong
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Join Date: Jun 2008
Thanks, I'll try it and give a feedback.
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