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2.1 Vrms -93db THD  out of 3.3VDC supply?
2.1 Vrms -93db THD  out of 3.3VDC supply?
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Old 31st January 2020, 05:24 PM   #11
lcsaszar is offline lcsaszar  Hungary
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Why would have any effect of the supply voltage on THD? This is not analog domain.
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Old 1st February 2020, 12:04 PM   #12
dreamth is offline dreamth  Romania
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Quote:
Originally Posted by lcsaszar View Post
Why would have any effect of the supply voltage on THD? This is not analog domain.
Not even when the I/v conversion takes place inside the DAC?
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Old 2nd February 2020, 02:13 PM   #13
Markw4 is online now Markw4  United States
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Quote:
Originally Posted by dreamth View Post
...where do i find relevant studies on low supply circuts vs distortions?
ESS published some distortion numbers for opamp buffers if used for the AVCC supply in a document on their downloads page: http://www.esstech.com/files/4514/40...PCB_Layout.pdf

They don't publish distortion numbers vs power supply quality for the other power pins, VCCA, DVCC, and (for some chips) DVDD. Although power quality on those pins can/does affect sound quality performance somewhat, it is probably not plain old stationary THD. Otherwise they would not need to be on separate pins (and on separate voltage regulators in eval boards), and ESS might publish easily measured distortion numbers for them.

Last edited by Markw4; 2nd February 2020 at 02:16 PM.
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Old 2nd February 2020, 03:40 PM   #14
dreamth is offline dreamth  Romania
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Quote:
Originally Posted by Markw4 View Post
ESS published some distortion numbers for opamp buffers if used for the AVCC supply in a document on their downloads page: http://www.esstech.com/files/4514/40...PCB_Layout.pdf

They don't publish distortion numbers vs power supply quality for the other power pins, VCCA, DVCC, and (for some chips) DVDD. Although power quality on those pins can/does affect sound quality performance somewhat, it is probably not plain old stationary THD. Otherwise they would not need to be on separate pins (and on separate voltage regulators in eval boards), and ESS might publish easily measured distortion numbers for them.
Thanks a lot Sir!
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Old 2nd February 2020, 05:18 PM   #15
dreamth is offline dreamth  Romania
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Looked into that document, but i thought it's about the internal guts of ESS dacs...i've signed some NDO with ESS in 2015 for ESS9018, actually measured their EVM on AP system 2 too...

Last edited by dreamth; 2nd February 2020 at 05:23 PM.
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