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Old 25th July 2014, 11:00 PM   #1
Trileru is offline Trileru  Romania
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Default Recommended i2s to spdif chip

Hi,
I am interested to make a i2s to spdif pcb so I can get the digital out of my raspberry into my DAC.
I know that there are some chips that do that but have no idea on quality etc.
Could anyone list some with short pros and cons please?
Thank you.
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Old 25th July 2014, 11:14 PM   #2
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You might want to consider this:
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Old 25th July 2014, 11:35 PM   #3
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Not quite,
I need a SPDIF output, not analog. I have my own DAC that I want to use. My DAC also supports i2s but I want to keep that path as short as possible that's why I want to use my DAC via SPDIF.
I need a chip that does i2s to spdif only. But there is some nice information about the layout in that link
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Old 26th July 2014, 12:06 AM   #4
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http://www.wolfsonmicro.com/document.../en/WM8805.pdf

It doesn't do only I2S to S/PDIF, it goes the other way too.
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Old 26th July 2014, 12:36 AM   #5
kevinkr is offline kevinkr  United States
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Wolfson WM8804 as well..
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Old 26th July 2014, 12:36 AM   #6
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Quote:
Originally Posted by Trileru View Post
Not quite,
I need a SPDIF output, not analog. I have my own DAC that I want to use. My DAC also supports i2s but I want to keep that path as short as possible that's why I want to use my DAC via SPDIF.
I need a chip that does i2s to spdif only. But there is some nice information about the layout in that link
FWIW I have made two identical dacs, one with i2s input and the other with spdif input. No idea why, but the i2s version sounds remarkably better. If your dac has i2s input, why aren't you keen on using it?
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Old 26th July 2014, 12:38 AM   #7
kevinkr is offline kevinkr  United States
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I was going to ask the same question, I2S will probably provide better results with the RPi if the dac is somewhat jitter tolerant.
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Old 26th July 2014, 12:38 AM   #8
Trileru is offline Trileru  Romania
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I may go with wm8804 as I have only 1 channel.
I can't put my raspberry pi inside my DAC as it does not fit so then I'd have to run longer i2s wires and that's not recommended... right?
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Old 26th July 2014, 12:44 AM   #9
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With I2S there's no isolation from common-mode noise, with S/PDIF a trafo can be used. Longer (say up to 15cm) I2S wires aren't generally a problem.
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Old 26th July 2014, 12:48 AM   #10
Trileru is offline Trileru  Romania
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15cm would only give me room to cut the case and run the wires outside into the Pi that would sit on top of it.
Or, make a new enclosure that can fit both the DAC internals and the Pi, and the power supply for the Pi and a source selector so I can use the Pi for streaming and PC when needed. And that's a hell of a lot more money than I'm willing to spend
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