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Old 2nd January 2014, 03:49 PM   #51
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Default Yes, and no

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Originally Posted by RollE2k View Post
i forgot to ask - if using external MCK from say two i2s sources - does this "switch" really work problem free with up to 100MHz?
The short answer is yes, there will be no problems. The long answer is no, as anything placed in the I2S signal path will damage the signal somewhat, resulting in some additional jitter. Make sure to keep I2S wiring as short as is possible as well.
I personally prefer to have a single I2S source, wired directly to my DAC (B-IIIse) with 5 mm U.FL cables, to keep form having any compromise at all in the I2S signal.
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Old 2nd January 2014, 04:12 PM   #52
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The short answer is yes, there will be no problems. The long answer is no, as anything placed in the I2S signal path will damage the signal somewhat, resulting in some additional jitter.
With a maximum propagation delay of .25nS, and that value likely to be similar or equal among the four bus channels on the chip, the amount of jitter introduced will be negligible at 100MHz. You would begin to worry about it above 400MHz, and even then it would be minimal.
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Old 3rd January 2014, 02:59 PM   #53
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The delay is practically constant, not random noise. So it will never be "jitter" (phase noise) just a delay.
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