Anybody using the new ESS Vout DAC (ES9022)? - Page 52 - diyAudio
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Old 7th February 2013, 04:52 AM   #511
qusp is offline qusp  Australia
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Quote:
Add 4 pads & holes then
adds another unintended inductor, that goes for the i2s inputs too.

nice job curryman, i'll have a bit more of a look, but the only thing I see at the moment is the clock and i2s trace routing and impedance. the clock traces seem too thin to me, for a 2 layer board they need to be thicker than this for 50ohms and thicker is lower noise for fast signals. the exact thickness will depend on the thickness of the PCB substrate.

also wrt the u.fl connectors, again having the pinheader after the u.fl like that, adds either an inductor if the header isnt fitted as well as an aerial if it is.

try doing it like this. the trace thickness in these pics isnt calculated, it was a rough illustration I did for someone else doing the same thing.
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File Type: png Screen Shot 2013-01-09 at 5.39.02 AM.png (18.4 KB, 507 views)
File Type: png Screen Shot 2013-01-09 at 5.39.47 AM.png (29.5 KB, 507 views)

Last edited by qusp; 7th February 2013 at 05:03 AM.
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Old 7th February 2013, 08:03 AM   #512
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Nice job curryman.

One question to you and qusp - is it necessary to have series resistors on I2S lines? Shouldn't be they rather on the transmitter side?

Kind regards,

Daniel
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Old 7th February 2013, 02:57 PM   #513
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Thank you all for your valuable comments

Please find attached the latest version of the board. I added another reg for the flipflops (By the way: soldering those tiny parts will be quite tough ). Since LT1761 and ADP-150 are pin compatible both can be used. Just add a C at the input for ADP or the bypass C for LT1761. Kept the LT1761-Adj for ES9023 power supply to allow for 3.6V though .

I removed the series resistors at the I2S line receivers but added some at source sides (did some reading and Popolvars comment makes sense ). I also changed pin headers and U.FL connectors as per qusp's recommendation. I2S traces are 0.7mm.

Did not change the output filter caps (C3 and C4). The Wimas are quite big and I didn't feel comfortable with the resulting layout. Hope you don't mind (the PPS caps are really good ).

Any further comments are appreciated!

Last edited by curryman; 7th February 2013 at 02:59 PM. Reason: added trace thickness
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Old 7th February 2013, 03:10 PM   #514
qusp is offline qusp  Australia
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I wasnt suggesting resistors (notice I didnt mention them) but that doesnt mean you shouldnt have them, its a build by build thing and some situations will indeed call for termination at both ends.

like I said, the pics were made to illustrate for another thread, the resistor network was just a neat way to tie the traces to something, as you cant have traces leading into thin air in diptrace. the pics were to illustrate the u.fl + header thing only
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Old 7th February 2013, 04:07 PM   #515
massimo is offline massimo  Italy
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Originally Posted by curryman View Post
The Wimas are quite big and I didn't feel comfortable with the resulting layout.
Aren't that big if you move Out_L and Out_R aside (or remove as you most probably won't use them as you integrated the JG Filter)

I can still see some tracks not at 45° or 90°.... just for aesthetic
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Old 7th February 2013, 09:36 PM   #516
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mmh, you seem to be really keen on FKPs If we change C3+C4 we would have to change C43+C53 too (same function). That would need some more rework Never the less, i'll see what I can do...
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Old 7th February 2013, 09:50 PM   #517
massimo is offline massimo  Italy
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Good idea, but space is too tight for C43_53, while I saw enough space in the middle of the pcb.
FKP caps were als suggested by EUVL, and you know how accurate he is OTOH pps caps were his 1st choice for JG Filter.....
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Old 8th February 2013, 10:43 AM   #518
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qusp, how to measure and design the source and receiver resistors? My old 10 MHz Hameg might help for LRCLK but for MCLK (e.g. 49.152 MHz) even a 100 MHz scope only shows 1st and 2nd harmonic? I guess not many will be able to test and design suitable values for their specific application

And what about the effect of having 0R resistors compared to just a trace?

If I want to have 50 Ohm impedance for the clock lines, TXline gives me 0.75mm trace width (1mm FR4, 35µm, 0.15mm gap) if I have a solid ground plane on bottom layer and surround the lines with GND on top layer. Would you agree?

Just as a small upgrade another version
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Old 8th February 2013, 08:06 PM   #519
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Originally Posted by curryman View Post
Thanks

When I order some boards I would be pleased to make some available for "beta test" (no guarantee of beeing free from any error ). I am also generally open for a later group buy if there is interest, however first I would want to talk to Joachim Gerhard and Jean Paul/Subbu since I don't want to get in competition in any way. Should be just an alternative for those who want to have (only) I2S in + JG filter buffer.

I used Panasonic ECHU PPS Film caps for C3 and C4 with very good results (same for C43 and C53 as per the JG filter buffer group buy BOM). However maybe FKP will additionally fit as an option.

ADP-150 really have impressive specs noise wise (more than 6dB less than LT1761) but they are not available as 3.6V version. Feeding the ES9023 with 3.6V gave slightly better results in my tests and others reported the same. But main reason was easy sourcing of LT1761 which is available at Reichelt Wanted to source all parts at a maximum of two suppliers (Mouser, Reichelt) to save shipping cost. Complete BOM isn't that much. Maybe another supplier could deliver everything?

Best regards, Daniel
what about using LT1763

Last edited by samoloko; 8th February 2013 at 08:14 PM.
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Old 9th February 2013, 10:23 AM   #520
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Originally Posted by samoloko View Post
what about using LT1763
What's the benefit of LT1763 other than providing more power (which is not necessary)?
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