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|25th October 2012, 02:00 PM||#1411|
Join Date: May 2004
Blog Entries: 1
|25th October 2012, 05:45 PM||#1412|
Join Date: Dec 2008
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?
== NIHIL SINE DEO - Nothing Without GOD ==
|25th October 2012, 10:17 PM||#1414|
Join Date: Sep 2011
Location: Close to Geneva - Switzerland
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
|26th October 2012, 12:19 AM||#1415|
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; 26th October 2012 at 12:33 AM.
|26th October 2012, 12:26 AM||#1416|
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.
|28th October 2012, 03:42 AM||#1417|
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,
One daughter board for me as well:
11.12. kp93300 X 2
14. merlin el mago
42. 43. 44. 45. Mats x 4
47. 48. lm1no2 x 2
54. steve jones
62. & 63. Claudius J. x2
|28th October 2012, 08:16 PM||#1419|
I just added myself to the spreadsheet for one. Thank you.
Last edited by grufti; 28th October 2012 at 08:21 PM. Reason: better
|2nd November 2012, 12:19 AM||#1420|
Join Date: Mar 2004
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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