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DAC8043 as volume control
DAC8043 as volume control
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Old 16th August 2016, 09:34 PM   #1
stolbovoy is offline stolbovoy  United States
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Default DAC8043 as volume control

I've read about how good DAC8043 is in multiplying mode as a volume control. I can't find anything about THD+N or similar metrics.
The thing that bothers me the most is +/-15v Vref (input) in the context of a single +5v supply rail. Does it work fine? Is it really better than PGA2320?

I've built a working prototype, but I have no proper instruments to measure it.
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Last edited by stolbovoy; 16th August 2016 at 09:40 PM.
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Old 17th August 2016, 09:38 PM   #2
audionootje is offline audionootje  Netherlands
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Can't help you with thd specs, but I am curious on how it sounds. Is your prototype an improvement over PG2320 volume control?
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Old 17th August 2016, 10:06 PM   #3
stolbovoy is offline stolbovoy  United States
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It sounds OK, but I think it can sound better. Nothing big, just have a feeling that it is not quite there. May be it is all in my head as I'm really skeptical about awesome distortion figures for +/-15v input on +5v power supply. Just thinking, that PGA23xx may be better as it specially designed just for this application and shows THD+N on the same level or better that "opamp-less" volume control ICs (MUSES72320, WM8818, DS1882) as least on paper
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Old 18th August 2016, 02:37 AM   #4
mlloyd1 is offline mlloyd1  United States
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DAC8043 as volume control
i think someone else here did this some years ago and had some good success.
if i find the link later, i'll post it.
i might be mis-remembering but i think he found some things to do to improve performance.
maybe LT1028 isn't best part for this application?

best regards,
mlloyd1
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Old 18th August 2016, 11:18 AM   #5
stolbovoy is offline stolbovoy  United States
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May be LT1028 is not the best part, but I trust it more than DAC8043.
Here is the post with THD plot: http://www.diyaudio.com/forums/analo...ml#post3477668
It would be interesting to see a similar plot for PGA23xx

Still I don't understand how does DAC8043 shows this good performance with +/-15v Vref on +5v power supply?
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