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EniGmA1987
607
Jun 4, 2018
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Is this DAC using serial resistors in the ladder? Or parallel? It sounds like it is serial from the wording...
This is kinda of an important question, so hopefully it can be answered before the product launches. Answering something so important about the product specifications only after the drop ends is not an honest way to sell a product. Serial resistors will need a lot of clock cycles to output all the data. Parallel can output all the data in 1 cycle.

Also does this have an FGPA doing resistance correction of the ladder? Or are you relying on the resistors entirely?
Jun 4, 2018
WilliamTse
102
Founder, Airist Audio
Jun 4, 2018
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EniGmA1987This is actually not an especially relevant concern for this DAC. R-2R DACs are inherently parallel by nature of the topology.
The core of the conversion is a resistor ladder with 24 rungs, corresponding to the 24 bits of each sample. The entire sample is converted at once. In a sign-magnitude design like this, there are two such ladders per channel (four total in this DAC) operating simultaneously.
Here's a basic tutorial on R-2R DACs if you'd like to learn more:
https://www.tek.com/blog/tutorial-digital-analog-conversion-r-2r-dac
Jun 4, 2018
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