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Old 21st February 2007, 10:50 AM   #1
ash_dac is offline ash_dac  United Kingdom
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Default Dynamic range vs Jitter ?

http://focus.ti.com/lit/ds/symlink/pcm1773.pdf

Figure 15. Dynamic range vs jitter (page 12)

Does this relationship only apply for this particular DAC ?
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Old 21st February 2007, 06:15 PM   #2
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" ... Does this relationship only apply for this particular DAC ? ..."

This is a measure of the "local" jitter of this chip only, a single element of a total DAC system. Total jitter should be measure of the combined of digital parts and the DAC for a complete system, cpu through digital interface through cable through downstream interface ... through this device. (Note that this "local" jitter component is measured in pico seconds ... total system jitter could be greater than a few micro seconds.)

Please correct me if I am wrong here ...
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Old 21st February 2007, 06:32 PM   #3
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=== just found this: http://www.cirrus.com/en/pubs/whiteP...Cs_of_DACs.pdf

Very interesting ...
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Old 21st February 2007, 07:20 PM   #4
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Default more than you wanted to know...

..just read your way through this lot, by the late Julian Dunn.

http://www.nanophon.com/audio/

It's a simple calculation in theory, but very complex in practice...! 'Measurement Techniques for Digital Audio' is a book - sorry, the book Dunn wrote on the matter for Audio Precision. Lots f good info in there... no longer available free, but the core elements are in the other papers available on this page. Recommended.
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Old 21st February 2007, 07:49 PM   #5
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Default Re: Dynamic range vs Jitter ?

Quote:
Originally posted by ash_dac
http://focus.ti.com/lit/ds/symlink/pcm1773.pdf

Figure 15. Dynamic range vs jitter (page 12)

Does this relationship only apply for this particular DAC ?

actually, i have no clue, but honestly, at a level of 500ps other things are that bad that i don't care about the loss of 1 dB....

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Old 3rd March 2007, 03:44 PM   #6
ash_dac is offline ash_dac  United Kingdom
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http://theaudiocritic.com/back_issue...ritic_21_r.pdf

Jitter article.

Does anyone use the measurement methods suggested ?
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Old 3rd March 2007, 10:58 PM   #7
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" ... Jitter article. Does anyone use the measurement methods suggested ? ..."

No, not anymore. The articles, begining on page 11, are as good as it got in 1994. Since then 16 bit / 44K & 48K recording technology through a 12 Mbps data link has given way to 24 bit / 96K, 192K and 384K through 400 to 800 Mbps data links. Most of the stuff discussed is very old technology. Since 1994 we have graduated through USB duplex, SCSI parallel, upgrades to SPDIF and now modern pro recording is done using double duplex and quad duplex data links, the output seldom being "boiled down" to 16 bit. ("All CDs suck ..." - Bob Dylan)

Latency and jitter questions have mostly been resolved with an order of magnitude better schemes, at least as far as recording content is concerned. Playback via DVD-A or SACD as well has obviated or at least addressed the jitter question to a far the well = ignoring mass market CDs for the moment.

The jitter and latency problems of old still exist with CD and USB playback, but there is no need anymore to go there. There is still a jitter problem with legacy SPDIF (et al), but not to any extent when bypassed direct to faster.

As long as your playback device is DVD-A or SACD and 24bit / 192K or better, the real question is how good is your DAC.
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