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dac noob is confused

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radiolistener:

--- Quote from: Wimberleytech on March 03, 2019, 02:26:37 am ---Yes, and I do real magic.  Forget the fact that it is illusion...that is just a manifestation of the real world in which we live.  Trust me, I made that helicopter disappear before your eyes.

--- End quote ---

there is no magic, all resolution bits of this DAC are meaning, nothing cut, nothing disappears. SNR and ENOB of ideal DAC is used just for indication of theoretical limit for the specified resolution. Such limit will be never reached in the real world, because it's impossible.

So, if you see that SNR of your DAC is worse than SNR of ideal DAC with the same resolution, this is normal. There is nothing wrong, and it's resolution is not fake, it's real :)

Here is spectrum of AK4499 output from their presentation:




SiliconWizard:
To answer the OP's question, there are controller boards you can use that will have USB connectivity and I2S output(s), and will be seen as an audio device on most OSs.

You can take a look at the XMOS-based boards for instance, such as this: https://www.diyinhk.com/shop/audio-kits/107-xmos-dsd-dxd-768khz-high-quality-usb-to-i2sdsd-pcb.html

Wimberleytech:

--- Quote from: radiolistener on March 03, 2019, 02:54:40 am ---
--- Quote from: Wimberleytech on March 03, 2019, 02:26:37 am ---Yes, and I do real magic.  Forget the fact that it is illusion...that is just a manifestation of the real world in which we live.  Trust me, I made that helicopter disappear before your eyes.

--- End quote ---

there is no magic, all resolution bits of this DAC are meaning, nothing cut, nothing disappears. SNR and ENOB of ideal DAC is used just for indication of theoretical limit for the specified resolution. Such limit will be never reached in the real world, because it's impossible.

So, if you see that SNR of your DAC is worse than SNR of ideal DAC with the same resolution, this is normal. There is nothing wrong, and it's resolution is not fake, it's real :)


--- End quote ---

This is not 32bits.  I give up.

jmelson:

--- Quote from: sahko123 on March 02, 2019, 10:34:27 pm ---im interested in adding a 32bit 768khz dac into an integrated amp design but have no clue how to turn the usb input into an I2C or I2S is this generally done with a microprocessor or dsp or what? NOt looking for recomendations (though they will be helpful) just some search terms to get me going

--- End quote ---
Sorry to be crude, but only an idiot would buy a 32-bit DAC.  If the full-scale voltage is 1 V, then the value of a single bit is 1/4294967296 of that, or 2.33 x 10 ^ -10.  That's 23 NANO-volts!  What could you possibly build that could detect such small signals?
Can you build a reference voltage supply that has noise within 1000 times that?  And, then you are going to pipe that through an audio amp and speakers?

Jon

jmelson:

--- Quote from: Wimberleytech on March 02, 2019, 10:58:03 pm ---...and what, pray tell, is a 32bit DAC?  It does not exist...pretty sure.

--- End quote ---
Yup, I think the 32-bits refers to a "frame" which contains two 16-bit samples, one left-channel, ore right.

Jon

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