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Old 25th June 2011, 01:59 AM   #181
2A3SET is offline 2A3SET  Canada
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Default CDE FCA cap

Another candidate over MLCC.

http://www.cde.com/catalogs/FCA.pdf

338-2778-1-ND from digikey, maximum 1uf.
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Old 25th June 2011, 05:00 AM   #182
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2A3SET,

I have some of these and tried them. Films will not be as effective as the MLCCs in these positions IF you strictly look at the residual feed through noise on the AVCC pin. Either way you need some specialized equipment to measure signals at this level. ~200uV or less.

Try it with and without them to make sure you are happy with the change after you add them. Adding them (MLCCs) to my layout directly on the 9023 reduced the ripple on the AVCC pin but also noticeably hurt the sound. I took them back out, leaving the 1uF films in place from the original layout.


Happy tuning,
Dave

P.S. I compared the 1uF CDE cap to the Panasonic ECPU 1uF film cap for general bypass on my board. I use the 1uF caps in parallel with a 0.01uF 0805 films for bypass everywhere instead of ceramics as a trial on this layout. Both films sounded great. Both also sounded virtually indistinguishable so I left the CDEs in place.

Last edited by fitzfish; 25th June 2011 at 05:22 AM.
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Old 25th June 2011, 05:08 AM   #183
EUVL is offline EUVL  Europe
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Did you take off your film caps when using MLCC ?

Patrick
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Old 25th June 2011, 05:18 AM   #184
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Hi Patrick,

Loaded answer -

I have films as bypass in the layout a short distance from the 9023 connected by a short length of trace. These were left in for the comparison.

I added the MLCCs and did some listening, then swapped them for the films directly over the chip for an apples to apples comparison. I swapped back to the MLCCs to do some more listening but in the end I took the added caps back out all together.

Dave
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Old 25th June 2011, 05:40 AM   #185
EUVL is offline EUVL  Europe
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Maybe you should try taking the film caps off when using MLCCs.

Patrick
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Old 25th June 2011, 02:46 PM   #186
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Hi Patrick,

I plan to revise the PCB to fix the line supply issues and tighten up the layout around the 9022. Once this is done, I will do some A/B testing and let you know.

Dave
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Old 25th June 2011, 03:12 PM   #187
massimo is offline massimo  Italy
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Quote:
Originally Posted by fitzfish View Post
I plan to revise the PCB to fix the line supply issues and tighten up the layout around the 9022.
Dave, your current pcb looks beautiful, but may I suggest to try to reverse the WM chip in order to keep the I2S tracks shorter?
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Old 26th June 2011, 12:02 AM   #188
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Hello

Anybody do have the ES9022 complete data sheet with the aplication schematic ?

And who sell the ES9022 chip in Canada ?

Thank

Bye

Gaetan

Last edited by gaetan8888; 26th June 2011 at 12:05 AM.
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Old 26th June 2011, 05:15 AM   #189
EUVL is offline EUVL  Europe
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ESS Tech is in North America ?

http://www.esstech.com/index.php?p=company_sales

Why not just give them a call ?

You can get any datasheets from ESS after you have sign a Non Disclosure Agreement.
Their engineering department would also answer any technical questions related to your applications.


Patrick

.

Last edited by EUVL; 26th June 2011 at 05:17 AM.
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Old 26th June 2011, 05:40 PM   #190
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Quote:
Originally Posted by massimo View Post
Dave, your current pcb looks beautiful, but may I suggest to try to reverse the WM chip in order to keep the I2S tracks shorter?
Thank you for the compliment!

I really don’t want to change the 9022/3 orientation. Rotating the 8804 is already under consideration and would shorten the trace lengths. We’ll see what makes sense in the overall scheme of things...

Thanks,
Dave
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