TAS1020B-based Asynchronous USB to I2S/SPDIF converter 24bit/96kHz - Page 3 - diyAudio
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Old 2nd March 2012, 01:28 PM   #21
regal is offline regal  United States
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I honestly am surprised at the lack of replies here. My experience is that the TAS usb are truly audio class components, while the Xmos is an attempt at USB hirez. At least I've noticed that Rankin's TAS USB1.0 asynch firmware sounds a whole lot better than the other commercial hirez products (I haven't heard Rankins hirez products).

I am not saying that the Xmos or Hiface or other high speed chips or bad, but there is something special I think to the TAS for audio.

I think there is some truth to the possibility that the xmos is just using the on board clocks as reference for its output.

This is just speculation and listening, some will say I have no business reporting what I hear but I think there is something to it and digital guys know about it.

I really believe that asynch USB should have been perfected at the RBCD level before jumping so fast into commercially more attractive hirez.

obviously the SD transport as for as SQ is tough to beat, and its RBCD only but not as flexible as a well implemented asynch USB. It does sound better than a Computer-TAS-SPDIF. But a Computer TAS-I2S-Masterclock at the DAC (like being done with the SDtransport) hasn't been explored, these TAS boards to give us that opportunity.
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Old 2nd March 2012, 03:12 PM   #22
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Hello,
I'm very interested in your board with the external clock and I2s output.
Can you generate also the clock for the dac?(ES9023 and ES9018)
I've also an SDtrans 384 but I think that your board can be an interesting option.
Ciao
Guglielmo
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Old 2nd March 2012, 10:26 PM   #23
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Hi
Do you think your USB/I2S module could fed a WM8741 DAC input ?
WM8741 accepts direct I2S signals.

Would it work with an Opus DAC ?
Here's the link to the Opus : Opus - A Balanced DAC

My knowledge is weak, but Opus I2S input works in "slave mode".
The USB/I2S module is supposed to generate the master clock.
Will your module do the job ?

Cheers

Phil

Last edited by korben69; 2nd March 2012 at 10:40 PM.
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Old 2nd March 2012, 11:09 PM   #24
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I see TAS1020B on many TI audio EVMs I test.
Using stock TI firmware, per test procedure.
I don't recall any unusual clocks, just ordinary
6 and 12, or 6 and 24... I doubt we have seen
this chip pushed to it's ultimate limits.

The circuits are pretty basic, an i2c eeprom,
pullups, crystals, and reset... TAS1020B part
of the circuit rarely ever goes wrong. If I got
any troubles, its usually somewhere else.

PCM5102EVM-U might have had some fancy
external clockworks, I think maybe was one...

Yeah, have a peek at the user's guide:
http://www.ti.com/tool/pcm5102evm-u
See that header across the middle: I2S...

Last edited by kenpeter; 2nd March 2012 at 11:33 PM.
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Old 6th March 2012, 09:23 PM   #25
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Hi JarekC,

Any luck getting 22.5792 Mhz and 24.576MHz clocks? I'd like to buy a Stage 3-spec board, assembled & tested, once they become available.

Regards,
John
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Old 6th March 2012, 09:57 PM   #26
kevinkr is offline kevinkr  United States
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Hi JarekC,
This is a subject that has recently become of great interest to me, and look forward to the availability of your TAS1020B version. If you plan to offer boards in the future or have any left I would be very interested in acquiring one.
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Old 7th March 2012, 06:01 AM   #27
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Dear JarekC,

are you aware whether your TAS1020B version supports integer mode when using players such as Audirvana and PureMusic?

Thanks
Roberto
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Old 9th March 2012, 07:41 AM   #28
regal is offline regal  United States
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Quote:
Originally Posted by kevinkr View Post
Hi JarekC,
This is a subject that has recently become of great interest to me, and look forward to the availability of your TAS1020B version. If you plan to offer boards in the future or have any left I would be very interested in acquiring one.
Same here, any updates JarekC ?
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Old 9th March 2012, 11:36 AM   #29
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Where's JarekC anyway???

Is he is serious to share his design and offer some to the fellow members here since there's no reply from him ???

Regards
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Old 9th March 2012, 03:22 PM   #30
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Hello JarekC

Golledge in the UK has some nice clocks that are inexpensive in qty of 500

MA02882 24.5760Mhz +/- 50ppm
MP01182 22.5792Mhz +/- 50ppm

They also have them in +/- 25ppm

regards,
George
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