Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz - Page 38 - diyAudio
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Old 7th October 2014, 07:37 AM   #371
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It would be interesting what kind of topology will be used on the discrete output version, current feedback possible?
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Old 7th October 2014, 10:05 AM   #372
Joschl is offline Joschl  Germany
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Maybe a little late... but please count me in for one 0,02% version module.
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Old 9th October 2014, 01:26 PM   #373
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Quote:
Originally Posted by soekris View Post
With a regular R-2R DAC you have the MSB switching at zero crossing, even with t.ex. a -60db signal. That mean that the THD is absolute so if you have -90 db THD at 0 db signal then you have -30 db THD relative to a -60 db signal.

That's why a regular R-2R DAC need to be very precise.

With a Sign Magnitude DAC it's like a sliding window as the MSB are NOT switching with lower level signals, so if you have -90 db THD at 0 db you will still have -90 db relative at to -60 db signal....

That's why my prototype get 0.006% THD at 0 db, even with just the 0.05% resistors on the prototype, and still get 0.027% at -60 db, which are probably from the measuring ADC anyway....
Iíve always understood that it is crucial that the resistors are very closely matched. Mostly done by hand.
It would be nice if you could measure THD at -60B with better test equipment than the EMU 0404.
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Old 9th October 2014, 02:32 PM   #374
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Will this be a dac only? I've got a few options of getting i2s into a dac, including an amanero & gustard u12 (both do 32bit / 384k).
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Old 9th October 2014, 05:07 PM   #375
Bones13 is offline Bones13  United States
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Thread title is for a DAC module, 24 bit x 384kHz. He discussed using a Wave I/0 board for input. I am sure most I2S sources will work.
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Old 9th October 2014, 05:28 PM   #376
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Sorry, I was asleep at the keyboard.
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Old 12th October 2014, 05:10 AM   #377
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0.01% or 0.02% board for eu please. Will you email when available?
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Old 12th October 2014, 07:24 AM   #378
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Do you guys even bother to read the first post? There is no list. The modules will become available in the webshop in due time.

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Old 12th October 2014, 07:32 AM   #379
Zoran is offline Zoran  Serbia
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Hi interesting datas here, by RayCtech
exaU2I - Multi-Channel Asynchronous USB to I2S Interface
same @
I2S LSB extensions - RayCtech > www.exadevices.com
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Old 12th October 2014, 08:59 PM   #380
Nikitas is offline Nikitas  United Kingdom
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Interesting!
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