linuxaudio.org

On Tuesday 17 February 2009 01:45:05 Fons Adriaensen wrote:

quoted text
> On Tue, Feb 17, 2009 at 08:13:02AM +0100, Arnold Krille wrote:

> > But not only do they sync up to four AD-converters to get one channel

> > with 4GS/s (current state of the art is 8GS/s!), they also sync several

> > of these devices to act as one digital oscilloscope with multiple

> > channels. They do the syncing by 10MHz clock and somehow manage to

> > distribute the trigger event to all devices involved. Quite spooky and

> > lot of hf to deal with.

>

> Yep, 10 MHz is the standard for reference frequency

> distribution for lab instruments. Getting decent GHz

> clocks from that requires careful PLL design.

>

> Returning to the original matter: multiplexing AD/DA

> do exist of course, and they are the best solution

> if you require lots of low bandwidth channels.

>

> One reason you won't find many of them in pro audio

> is the channel isolation requirement (> 100 dB)

> - it would be very hard to make a fast analog

> multiplexer reaching anything near that figure.

>

> Ciao,

Thanks for all the advice and help on this issue folks. I really appreciate

it!

--

Bearcat M. Şandor

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