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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Old 22nd July 2014, 11:01 AM   #21
Flikoman is offline Flikoman  Croatia
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I am interested in 0.02% version.

I would also like to know a little bit more about power supply requirements, output stage (what do you recommend etc). Firmware update via USB would be nice.
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Old 22nd July 2014, 11:03 AM   #22
Shinja is offline Shinja  Japan
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0.0063%=-84dB=14bitENOB and 0.37%=-49dB=8bitENOB=109dB of D-range
it is surprising performance with 0.05%=11bit resister, especially D-range!

However I doubt it is effective using too much quality resister.
You are using 74LVC595A and NXP's one have on resistance 33Ω at on and 23Ω at off state at Vcc=3V.
How much is the ratio its 10Ω of deviation to ladder resister? about 0.4%?
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Old 22nd July 2014, 11:28 AM   #23
EUVL is offline EUVL  Europe
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Very sensible questions from someone who has obviously gone through the design exercise himself.




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Old 22nd July 2014, 02:24 PM   #24
casshan is offline casshan  Hong Kong
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Please count me in 0.02%,thanks!
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Old 22nd July 2014, 02:34 PM   #25
jean-paul is offline jean-paul  Netherlands
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Quote:
Originally Posted by esgigt View Post
Jean-Paul, are there any useful techniques to tackle the problem of the "naked" resistors? Using some kind of (plastic) coating?
Normally I use stuff that is designed to dip transformers in. A very slow curing epoxy. I don't know if this would be good for this particular application. It seems like a BB type R2R DAC but then not molded in an epoxy DIL casing thus exposed to the environment.
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Last edited by jean-paul; 22nd July 2014 at 02:42 PM.
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Old 22nd July 2014, 03:01 PM   #26
esgigt is offline esgigt  Netherlands
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Quote:
Originally Posted by jean-paul View Post
Normally I use stuff that is designed to dip transformers in. A very slow curing epoxy. I don't know if this would be good for this particular application. It seems like a BB type R2R DAC but then not molded in an epoxy DIL casing thus exposed to the environment.
Thanks, Jean-Paul.
I even wouldn't know where to buy that stuff
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Old 22nd July 2014, 03:09 PM   #27
merlin2069er is offline merlin2069er  Canada
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Very nice! Where do I sign up?
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Old 22nd July 2014, 03:53 PM   #28
TBM is offline TBM  Norway
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Impressive!
Do you have any linearity, impulse and squarewave plots that you can share with us?
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Old 22nd July 2014, 04:37 PM   #29
Ken Newton is offline Ken Newton  United States
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Originally Posted by TBM View Post
Impressive!
Do you have any linearity, impulse and squarewave plots that you can share with us?
Impulse and square wave plots for a DAC will usefully depict only the digital filter implementation, which Soekris has stated is to be firmware re-configurable within the FPGA. While I would expect a static linearity plot to show some non-monotonic behavior among the lower LSBs, the distortion spectrum plots already provided are a better indicator of A.C. distortion.
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Old 22nd July 2014, 05:01 PM   #30
Gopher is offline Gopher  United Kingdom
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Great project. All we need now is some 28 bit/384 kHz music to play through it. Anyone got some?
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