XMOS-based Asynchronous USB to I2S interface

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#2,761
Eldam said:
IIRC the pin 4 of TDA1541 non-A accepts 12 MHz ! (datasheet says that it is only 6 MhZ Fsck on pin 4 with the A datasheet but the double on non-A !)

I had the same idea than you as my understanding is you have better to use the pin 4 then pin 2 in I2S mode with the TDA1541 non A ! (son pin 2 unpluged and floating) ! My understanding is when using the A chip with pin 2, bettere to ground pin 4 but not sure: complicate ! some relation with pin 28 and pin 8 or 6 iirc (yes a simple DEM decoup pins !) as well !

I should say Ifind in normal pin 2 conf the TDA1541 non A to be very good (different beast than the A !) ! Ah I have to verify it's not marked Y (I read somewhere if I 'm not mistaken than some non A marked Y (as prototype... and marketed on some Philips/Marantz) has the cap Inside in the Fdem (between pin 16&17). So with pin 4 it should be even better !

Ah sorry for the off topic.
Click to expand...
Eldam,
Quite on, as many of us send their stuff through this DAC chip.
Y marked: interesting, as I have several non-A's that are A's 🙂 including one with a crown 😀. Still I am not using it.
--> my problem so far is that I did not get higher rate on the TDA than 128 kB. But I plan to actively study it in the coming months.
 
#2,764
Hello.

My WaveIO-board went dead on me this morning. Worked great yesterday, but nothing today. Green light is on but not recognized on both of my computers (Windows 7 and 8.1). Tried internal and external USB-connections and internal and external power supply but no difference. Tusb Audio states "no device(s) connected. I've tried several USB-cables lately so maybe I've fried it with static electricity or something. I really have no clue what's happened.

Any tips or hints for making it work or just throw it in the dustbin?

Vidar
 
#2,767
Yes, I've measured and everything looks ok. I can't install the drivers again since Windows do not recognize the card.

Also forgot to mention that both Windows versions refuses to initialize if the WaveIO is connected to the computer at startup. Seems to be a very serious problem.
 
#2,769
Hi Guys, I am about to use the WaveIO to provide I2S to a Metrum Accoustics EVA Dac board -

All Engineering

I have previously used the WaveIO to run my DDAC boards, my question is how to power the Isolator chip for the isolated I2S output. The DDAC had provision for this, the EVA Dac does not.

I use a AMB Sigma to provide clean +5v to power the WaveIO

The σ11 regulated power supply

Could I use another one set at 5V and if I do where does the ground go?

Thanks for any guidance on this!
 
#2,770
You have to power the isolator corner left up where is marked V+ & gnd.
 

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#2,773
Albert is ok because using the Ian's PCM converter PSU you are isolating the PSU coming from the self powered USB or external WaveIO psu. You musn't share self powered USB or external WaveIO psu with the I2S isolated outputs psu because if you share you aren't isolating....
Felipe
 
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#2,775
In the documentation of the WaveIO, I see it mentioned:
There are also 5 pins dedicated to isolated GND. They should be used.
Some words about I2S Master clock signal: it is provided in case that it's required by some DAC chips like PCM1794 but there are few things to know before use this signal:
a) can be used to realign the WaveIO NON-isolated I2S output signals at the receiver's side (DACs)
Click to expand...

Lucian,
I have some troubles in my DAC: I cannot go above 88 kHz. The 88kHz looks fine on the scope.
I use the WaceIO isolated output to feed the PCM card of Ian; but also the not-isolated MCLK!
So there is a possible fault in my 'architecture'.
  1. I break the isolation first of all
  2. secondly there is a time-lag in the isolator that is (inherently) not in the MCLK signal
Do I pinpoint a possible cause for the error I have?

I have been thinking about the power supply, I see flaws in my design (remote box with transformers) and the feeding earths have capacitative and inductive coupling. But I also had almost the problem when I had everything in one box.
 
#2,776
triode_al said:
In the documentation of the WaveIO, I see it mentioned:


Lucian,
I have some troubles in my DAC: I cannot go above 88 kHz. The 88kHz looks fine on the scope.
I use the WaceIO isolated output to feed the PCM card of Ian; but also the not-isolated MCLK!
So there is a possible fault in my 'architecture'.
  1. I break the isolation first of all
  2. secondly there is a time-lag in the isolator that is (inherently) not in the MCLK signal
Do I pinpoint a possible cause for the error I have?

I have been thinking about the power supply, I see flaws in my design (remote box with transformers) and the feeding earths have capacitative and inductive coupling. But I also had almost the problem when I had everything in one box.
Click to expand...
I checked and I was wrong in the previous post: I have used
DT = I2S Data,
LR = I2S Word Clock,
BC = I2S Bit Clock,
MC = I2S Master Clock. and this goes to the PCM-board MCLK. is that correct?
 
#2,777
Computer crash again 😡
@ Vbenonisen: You have PM! It's most likely a chip was damaged by ESD spikes thus your WaveIO cannot communicate anymore with the host through USB bus!
Please consider sending your card back here for repairs, as I suggested in my PM to you!

@ blueixus: I don't know if you find the answer to your question (Thank you all for support, especially Felipe!) but if not then please PM me.

@ ljufa: Have you managed to convince your WaveIO to work on Linux and play Native DSD streams? Please excuse me if I'm pressing you in any way!

triode_al said:
I checked and I was wrong in the previous post: I have used
DT = I2S Data,
LR = I2S Word Clock,
BC = I2S Bit Clock,
MC = I2S Master Clock. and this goes to the PCM-board MCLK. is that correct?
Click to expand...

Well, I'm not entirely sure what's happen there but all connections above are as expected!
DT stands for I2S_DaTa,
LR is for I2S_Left/Right_Clock (or I2S_LRCK)
BC stands for I2S_Bit_Clock and
MC is I2S_Master_Clock

I'm really sorry for all this confusion, but I swear I'll put more texts on the silkscreen next time just to avoid all these situations!
Kind regards,
Lucian
 
#2,778
Lorien said:
Have you managed to convince your WaveIO to work on Linux and play Native DSD streams? Please excuse me if I'm pressing you in any way!
Click to expand...

Hi Lucian, no problem you don't pressuring me at all.
I've done everything but stuck on switching dac to dsd mode.
In my setup after waveio I use this AK4490 board that needs external SPI or I2C micro controller command sequence to switch to dsd mode playback.
So far I didn't manage to find any module on the market for this job, there is only diyinhk usb to i2s converter that is capable to send i2c command but even if I have it I have no idea how it would help in combination with waveio.
BTW, is there any support in waveio that could help dac to switch to dsd?
How other dac recognize DSD? From I2S signal itself?
 
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