Posted by edanovaro@tin.it (A) on March 25, 2007 at 14:50:43

Is it possible to modify the Rakk DAC MkII and use a I2S input ?
Someone is planning to add a USB input stage ?
Thanks
Emanuele

• SRC4192's I2S input - rickmcinnis@dogwoodfabrics.com 15:20:34 04/05/07 (0)
  In Reply to: Rakk DAC I2S & USB posted by edanovaro@tin.it on March 25, 2007 at 14:50:43:

  I readily admit I know nothing about how all of this works.

  I was reading the datasheet for the SRC4192 and see it accepts I2S data.

  Could one bypass the CS8416 and go straight into the upsampler?

  I had to ask. Seems too easy, I know.

  Thanks,

  Rick McInnis
  
  

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• Re: Rakk DAC I2S & USB - Dave Davenport 20:38:00 03/25/07 (2)
  In Reply to: Rakk DAC I2S & USB posted by edanovaro@tin.it on March 25, 2007 at 14:50:43:

  Hi Emanuele,

  I think so but I have not done it so I am not sure how it would turn out. My main concern is the grounding between the existing circuitry and the new, added, circuitry.

  Several people were planning t do this with the original RAKK dac but I never heard if they had succeeded. If someone has done this, please let me know how it turned out.

  If you get serious about the project contact me and we can discuss the details.

  Dave
  

  
  
  

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  • Re: Rakk DAC I2S & USB - edanovaro@tin.it 09:06:42 03/26/07 (1)
    In Reply to: Re: Rakk DAC I2S & USB posted by Dave Davenport on March 25, 2007 at 20:38:00:

    It seems that common USB-I2S interfaces are based on PCM270x DAC, that is limited to 48 Khz and 16 bits. TAS1020B supports 96Khz/24bits or even 192/24 but it requires some programming. We have also to think about external clocking, since jitter test on other USB devices are really bad (please refer to http://www.diyhifi.org/forums/viewtopic.php?t=432 )

    Moreover we have to buffer the USB, otherwhise we can run out of data
    (see http://www.head-fi.org/forums/showthread.php?t=225838&page=3 ).
    I think that an outstanding USB to I2S (or SPDIF) interface is quite difficult to implement... I'll try to study it a bit further.
    Emanuele
    
    

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    • Re: Rakk DAC I2S & USB - clio09 14:01:45 03/26/07 (0)
      In Reply to: Re: Rakk DAC I2S & USB posted by edanovaro@tin.it on March 26, 2007 at 09:06:42:

      Steve Nugent at Empirical Audio might be of some assistance to you on this. He has a lot of experience in I2S interfaces and has developed a board that can be installed in a Benchmark DAC. I have a transport and DAC with I2S interface which I am considering sending to Steve to modify. H emay be able to answer your questions.
      
      

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