XMOS-based Asynchronous USB to I2S interface - Page 142 - diyAudio
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Old 25th October 2012, 01:00 PM   #1411
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Quote:
Originally Posted by Lorien View Post
Okay, my english language skills are killing all of us
L
Thanks, perfectly clear, and yes, daughters are connected to mothers, and i figured out long ago that wave-io was the mother of all asynchronous interfaces
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Old 25th October 2012, 04:45 PM   #1412
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Originally Posted by hochopeper View Post
2. Isolated i2s from J6 header. Use IPC cable from header to supply i2s to DAC and provide the required logic voltage (is your dac's i2s input expecting 5V logic or 3v3?) as input to the appropriate pins on the header.

interesting observation, so I wonder how can this device be set in order to provide these two different voltage I2S signals for the different type of DAC(s)?
I mean that some DAC needs 3,3V I2S signal, others (like mine) need 5V I2S signal - so how can this be achieved with this WAVE I/O motherboard?

Thanks
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Old 25th October 2012, 04:48 PM   #1413
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Typically, 5V logic will work with 3.3V signals, but not the other way around.
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Old 25th October 2012, 09:17 PM   #1414
JLOP is offline JLOP  France
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Quote:
Originally Posted by hochopeper View Post
Sorry for not replying earlier. I forgot to come back.
I hope you are kidding Chris
Thanks a lot, you are really helpful. I gotta dig your answer and make a drawing to make sure I understood everything properly for the cabling.

I joined schematic from my Dac, seems that the DAC is fed in 5v. I will study datasheets more in detail to check where exactly insert the I2S, should i understand that it is right in the DAC chip after the 74C02. I will study Ian's thread too.

BR from Paris
Jean-Louis
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File Type: png AD1865INTERFACING I2S.png (59.8 KB, 692 views)
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File Type: pdf Schematic DAC AD1865_SRPP.pdf (54.9 KB, 54 views)
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Old 25th October 2012, 11:19 PM   #1415
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Quote:
Originally Posted by luxury54 View Post
interesting observation, so I wonder how can this device be set in order to provide these two different voltage I2S signals for the different type of DAC(s)?
I mean that some DAC needs 3,3V I2S signal, others (like mine) need 5V I2S signal - so how can this be achieved with this WAVE I/O motherboard?

Thanks
Provide 5V on V+ pin of J6 and the i2s on J6 will be 5V and isolated from the computer/fpga noise as well

As Brian has said above, typically 3.3V i2s -> 5V logic (DAC inputs or ttl logic gates) will work ok. 5V logic -> a device expecting 3.3V logic is not recommended, likely will end badly for that DAC chip(s).

Edit: If you check your DAC datasheet, it should specify low/high cut-off levels and a voltage tolerance on the digital input pins.

Last edited by hochopeper; 25th October 2012 at 11:33 PM.
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Old 25th October 2012, 11:26 PM   #1416
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Quote:
Originally Posted by JLOP View Post
I hope you are kidding Chris
Thanks a lot, you are really helpful. I gotta dig your answer and make a drawing to make sure I understood everything properly for the cabling.

I joined schematic from my Dac, seems that the DAC is fed in 5v. I will study datasheets more in detail to check where exactly insert the I2S, should i understand that it is right in the DAC chip after the 74C02. I will study Ian's thread too.

BR from Paris
Jean-Louis
If you're using the AD1865, certainly check and ask questions in Ian's I2S to PCM thread and FIFO also. The i2s to pcm coverter is a great solution to this problem.

If you use Ian's conversion board then you would connect this to the DAC inputs (bypass the nor logic gates). If you use WaveIO directly you must connect via the logic to convert i2s to a pcm signal that your dac is expecting. The issue that Ian's board addresses is that there is variations in the logic gate operation time, this adds jitter to the signal regardless of how good the transport might be. Ian's board performs a similar conversion, but does the conversion better IMO and then performs a re-clocked stage for minimum jitter before connecting to your DAC.
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Old 28th October 2012, 02:42 AM   #1417
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Cool Me tooo...

Returning to this thread after more than a year.

In contrast to most other users of WaveIO, my experience is that regardless of ground noise from non-isolated I2S, my TDA1541A based DAC still sound better with it than isolated I2S of current WaveIO. This is my personal opinion and I have no measurements to prove it.

Nonetheless, I wish to have USB isolation without resultant higher jitter from NVE IL715. Thus,

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Old 28th October 2012, 04:46 PM   #1418
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List updated, thank you!
L
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Old 28th October 2012, 07:16 PM   #1419
grufti is offline grufti  United States
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I just added myself to the spreadsheet for one. Thank you.

Last edited by grufti; 28th October 2012 at 07:21 PM. Reason: better
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Old 1st November 2012, 11:19 PM   #1420
Sandor is offline Sandor  Italy
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Default Connectors for WaveIO headers

Could anyone suggest a connector suitable for attachment to the J9 (external power), J12 (indicator LEDs) and J6 (I2S) headers of the WaveIO board?
A suggestion of a Farnell or RS part number would be geat.
Thanks a lot.
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