XMOS-based Asynchronous USB to I2S interface

[Sandor]

One board for me. Thank you.

1. hirez69
2. analog_sa
3. m.massimo
4. ozlegend
5. luisbock
6. vitalica
7. palmito
8. gabanyayaya
9. danny_66
10. shoom
11.12. kp93300 X 2
13. lindamar
14. merlin el mago
15. Reo
16. arkadiush1
17. jmltinc
18. zibra
19. tagheuer
20. hochopeper
21. hacker
22. Bemused
23. vanwykca
24. sandor

[audiodesign]

The my DAC using XMOS module is finished.

USB DAC 2 - Hi-Resolution System

I will make some little correction to the firmware.

[Lorien]

Originally Posted by Joshua_G

Hi,
How much is the PCB?
Do you still have ultra low phase noise NDKs?

You have PM. Thank you!

Originally Posted by qusp

[...] Lorien did mention compact was desirable, but then he mentioned the salas reg =)

We all know that "compact design" is relative thus subjective concept. If a PSU is good enough but uses a large amount of heavy parts then I could try to replace some of them with smaller ones while (try to) keep the performance for the entire design.

Originally Posted by PreSapian

i'm experiencing signal dropouts. it's most apparent with vocals and sounds like jittery distortion.

my usb cable is 6 feet long and i only have psu for isolated i2s. signal is fed to a 1543 module.

i don't remember experiencing this when i had the same psu hooked up to waveio ext. power instead and feeding the 1543 through direct i2s. (but then i was too busy marveling at the new sound)

i also can't seem to get it to work in linux after the psu swap- the card is recognized but no sound...

6 feet USB cable is too long for WaveIO. In addition do not kill it (and you ears too) by using USB power instead of external one. As for Linux, there are guys here that are more experienced than me and maybe there is someone that want to help you (wlowes, PET-240 ?)

Kind regards,
Lucian

[hochopeper]

Originally Posted by Lorien

6 feet USB cable is too long for WaveIO. In addition do not kill it (and you ears too) by using USB power instead of external one. As for Linux, there are guys here that are more experienced than me and maybe there is someone that want to help you (wlowes, PET-240 ?)

Sorry Lucian I missed the earlier post from PreSapian.



@PreSapian, Can you check alsamixer for mute/unmute the card? Also try running alsa-info and posting the resulting text file link and info here.

[Lorien]

+1 to the list:

1. hirez69
2. analog_sa
3. m.massimo
4. ozlegend
5. luisbock
6. vitalica
7. palmito
8. gabanyayaya
9. danny_66
10. shoom
11.12. kp93300 X 2
13. lindamar
14. merlin el mago
15. Reo
16. arkadiush1
17. jmltinc
18. zibra
19. tagheuer
20. hochopeper
21. hacker
22. Bemused
23. vanwykca
24. sandor
25. jrling

Thank you Chris!

[Corpius]

Hi Lorlien,

Do you advise to use 3.3v for the isolated i2s output or is 5v delivering an equally good performance? Assuming both are low noise.

According to you and the datasheet both can be used, but I remember a discussion about low noise 3.3v regulators.

[PET-240]

p.s. hochopeper know much more about Linux than me........wlowes has a Wave on Linux definitely.
I know enough to be dangerous, mainly to myself.......though its harder to let the smoke out of a pc compared to my day job......

[hochopeper]

Originally Posted by Corpius

Hi Lorlien,

Do you advise to use 3.3v for the isolated i2s output or is 5v delivering an equally good performance? Assuming both are low noise.

According to you and the datasheet both can be used, but I remember a discussion about low noise 3.3v regulators.

This is entirely dependant on your DAC. Is the i2s input on your DAC TTL or LVTTL tolerant?

[Corpius]

Originally Posted by hochopeper

This is entirely dependant on your DAC. Is the i2s input on your DAC TTL or LVTTL tolerant?

good point, I was not thinking about this.

Then it would be 3.3v in my case

Thanks!

[qusp]

Originally Posted by Lorien

You have PM. Thank you!


We all know that "compact design" is relative thus subjective concept. If a PSU is good enough but uses a large amount of heavy parts then I could try to replace some of them with smaller ones while (try to) keep the performance for the entire design.
.....

Kind regards,
Lucian

True, but as I mentioned, what benefits shunts can have over other types are not really of any benefit for a clock reg IMO, the extra heat and size are just a waste of effort. For this application absolute lowest noise and the ability to place it close to the dac trumps low output impedance over a wide band and great dynamic behavior. the small flea regs are very difficult to beat for clock power, demian has posted some nice designs too, with lower noise than either and compact, but you would have to get permission.

the integrated design is interesting, with the floating clock output. I suspect you would need to substitute the output transistors for 100mA+ though