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DigiOne RCA/BNC output for RPI
DigiOne RCA/BNC output for RPI
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Old 6th April 2017, 10:21 AM   #11
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by alpee View Post
Will there be an I2S output?
Nope. You can get a reclocker for i2s output.
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Old 6th April 2017, 10:23 AM   #12
cdsgames is offline cdsgames  Canada
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Quote:
Originally Posted by Gusser View Post
AES is a prootocol, not an electrical interface standard by it's self. That's why you can have both XLR and BNC. The voltage levels are also different.

I agree that an RCA connector is not a good choice from a mechanical perspective. But electrically, there is no performance difference over a BNC.

If you look at standard transmission line theory, it's quite apparent that the physical distance of a BNC or RCA connector is much shorter than the wavelength at a 96khz sample rate, which is 6.14mhz.

The broadcast television industry used 50ohm BNC connectors throughout the analog NTSC era. Same reason, because at 6mhz, that mismtach is not relevant. Now when we went to digital video systems at 270mbs (143mhz), then the use of 75ohm BNC's became more widespread. When we went HDTV at 1.5 or 3gbs (745mhz / 1.5ghz) , 75ohm BNC connectors became mandatory. But not for lowly AES.

All this fuss over connector impedance for AES/SPDIF is just another audiophile ledgend. In the broadcast and mastering industry we don't worry about that because as electrical engineers working in the communications sector, we are required to understand transmission line theory. Provided the cable length restrictions, aka attenuation, are adhered to, there is absolutely no difference in audio performance between 110ohm AES and 75ohm BNC. We convert between them all the time with simple transformers. Many hundreds of them installed where I work at Technicolor's mastering facility..
Good explanation .
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Old 11th May 2017, 10:19 AM   #13
cdsgames is offline cdsgames  Canada
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first pic

Testing has started.
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File Type: pdf DigiOne.pdf (703.0 KB, 137 views)
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Old 11th May 2017, 11:52 AM   #14
TNT is offline TNT  Sweden
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Quote:
Originally Posted by cdsgames View Post
To all this community that has been invaluable to me.

DigiOne specs :

RCA and BNC outputs (gold plated) only (absolutely no optical, it has by definition 4ns of jitter).
Maybe there is a re-clocker in the other end - then, toslink is superior to all other galvanic interfaces.

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Old 11th May 2017, 11:55 AM   #15
Bas Horneman is offline Bas Horneman  Netherlands
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I took the liberty of putting the pic up here. pdf is nice but direct pic is better
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Old 11th May 2017, 11:59 AM   #16
Dimdim is offline Dimdim  Greece
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DigiOne RCA/BNC output for RPI
Quote:
Originally Posted by cdsgames View Post
first pic

Testing has started.
Very nice!

I see a couple of components on the bottom of the board bridging the "clean" and "dirty" sides. Are they caps?
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Old 11th May 2017, 12:28 PM   #17
cdsgames is offline cdsgames  Canada
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Originally Posted by Dimdim View Post
Very nice!

I see a couple of components on the bottom of the board bridging the "clean" and "dirty" sides. Are they caps?
Yes. As per datasheet, common mode noise suppression on DC/DC convertor
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Old 11th May 2017, 12:53 PM   #18
Dimdim is offline Dimdim  Greece
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DigiOne RCA/BNC output for RPI
OK, but won't these caps also couple the RF noise from the dirty side to the clean side?
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Old 11th May 2017, 01:18 PM   #19
cdsgames is offline cdsgames  Canada
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Before the convertor we have a PI filter and another PI filter after...there should be absolutely no RF passing the second filter...or rather should be attenuated by (not sure exactly) by at least 90db (at Mhz range)
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Old 11th May 2017, 08:54 PM   #20
sckramer is offline sckramer  United States
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Nice! Do you plan on a shield over the clocks, looks like there's a solder pad for one?

Are you sending the clocks into the WM8805, or are you using it in PLL mode, then clocking somehow afterwards?

Is there a place avail to tap into MCLK?
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Last edited by sckramer; 11th May 2017 at 08:58 PM.
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