USB Lead Help Please.

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Originally Posted by Labarum

What experiences have others?

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Very old IBM ThinkPad on docking station, purely being used as a "client" on the network for itunes sharing, and spotify/internet radio running XP - connected to Caiman via aforementioned Belkin premium lead (direct to the docking station) - both DAC and laptop plugged into Tacima mains conditioner - no problems at all.

HOWEVER - the standard PSU on my Roku Soundbridge was introducing some noise into the system previously (including on the monitor screen) so entirely possible a laptop PSU could be doing the same - I bought a cheapo ebay replacement which cured the issue! (this was before I was converted to the benefits of mains conditioners! ;) )

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Originally Posted by chebby

The second line of this TI PCM2902 page says USB 1.1...

http://focus.ti.com/docs/prod/folder...t/pcm2902.html

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I better look for a better solution then...

about which one is discussion - pcm2902 or pcm2902b ?

I have referenced this tremendously long thread before

http://www.computeraudiophile.com/co...04-mini-review

It seems it is possible to achieve higher than 24/96 with USB 2 using custom drivers and providing the USB socket is correctly implemented - apparently many are not.

I don't understand all the technical bits, and I do understand that a Standac is not aiming higher than 24/96 - but parts of the thread may be worth reading.

And where this essay gets us, I don't know.

http://www.computeraudiophile.com/co...B-Audio-Primer

pcm2902b (usb2) has:
16-Bit Delta-Sigma ADC and DAC
Sampling Rate:
DAC: 32, 44.1, 48 kHz
ADC: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz

I do not think that 24/96 will be possible from USB connection.

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Originally Posted by Gints

about which one is discussion - pcm2902 or pcm2902b ?

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PCM2902B

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Originally Posted by Gints

I do not think that 24/96 will be possible from USB connection.

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It has already been achieved, and bettered. See my last post.

but that was other chip and solution.

This is from link in your post

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Most USB capable DACs today use adaptive mode USB. This is commonly done using a PCM270x chip from TI and to a lessor extent the PCM290x or CMedia parts. The big plus for DAC Manufacturers when using this chip is that no programming is required. The chip can be "popped" into place without extensive R&D, USB audio programming skills, a lengthy time to market, and a substantial amount of money. Big drawbacks to this method are very limited sample rate support (32, 44.1 & 48k), maximum of 16 bit audio, and sound quality.



Another less common adaptive USB implementation is done using a TAS1020 chip. Manufacturers then have a choice of implementing the chip exactly like the PCM270x without additional programming or possibly using the example code provided by TI, or the manufacturer can purchase code from CEntrance, Inc. to use with the TAS1020. Popular devices using the CEntrance code are the Benchmark DAC1 variants, Bel Canto USB Link, and the PS Audio Perfect Wave DAC. Using the TAS1020 and CEntrance code greatly enhances the USB interface and allows native 24/96 playback without the need for additional device drivers or special software
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TAS1020 is discontinued

yes, I saw that. But it is about chips with manufacturer fixed settings and chips which are programmable by designer.