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vladimirb0b  
#1 Posted : Monday, September 28, 2015 12:52:28 AM(UTC)
vladimirb0b

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While waiting for parts to be in stock I have ordered a DAC that doesn't have the best jitter specs in the world. It is the E-MU 0404 USB and has a PLL that is < 500ps rated. Once I can get TP parts it will be a second setup. My question is, would the chain above be useful for jitter rejection? IS there reason to think that it would end up reducing jitter in the DAC?

Thanks,
v
vladimirb0b  
#2 Posted : Tuesday, September 29, 2015 1:17:06 AM(UTC)
vladimirb0b

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I looked through the WM8804 Datasheet and have the following for jumper settings. Would appreciate a correction if they are wrong

First 8804:
AIF/MS - 1 (master mode)
TXSRC - 0 (SPDIF in)
AIFCONF1 - 0
AIFCONF0 - 1

-> Metronome ->

Second 8804:
AIF_MS - 0 ( slave mode)
TXSRC - 1 (I2S in)
AIFCONF1 - 0
AIFCONF0 - 1
vladimirb0b  
#3 Posted : Tuesday, October 6, 2015 5:00:03 AM(UTC)
vladimirb0b

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Still thinking about making a clock box. Original idea was WM8804 -> metronome -> WM8804.

Now I am wondering if I could *omit* the first WM8804 and let the metronome go without I2S input. If I set it to a certain frequency, say 24bit 96 kHz will it put out the proper clocks to interface with the second 8804? The signal doesn't matter to me, just the clock.

v
Russ White  
#4 Posted : Monday, October 12, 2015 9:10:38 PM(UTC)
Russ White

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So you want to receive SPDIF -> reclock -> Send SPDIF?
vladimirb0b  
#5 Posted : Tuesday, October 13, 2015 3:29:57 AM(UTC)
vladimirb0b

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Pretty Much. But I am thinking all I really need is generate clock (with metronome) -> send SPDIF. I want to use the metronome as a high precision SPDIF clock so the audio data doesn't matter at all. So I would operate the 8804 as slave mode like above. I am also hoping that I can remove the 8804 board clock without hurting anything.
Russ White  
#6 Posted : Wednesday, October 14, 2015 12:52:22 PM(UTC)
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Well my feeling is this. It may help - but likely won't make a huge difference because SPDIF receivers usually use some form of PLL to recover a clock from the incoming signal. Still I suppose it would be a fun experiment. I have never tried doing it.
vladimirb0b  
#7 Posted : Wednesday, October 14, 2015 5:56:56 PM(UTC)
vladimirb0b

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Still need to know a few things.

Will slave mode let the 8804 lock on and pass the SRC4192's signal?
Do I need an input for the metronome? Or can I just go SRC4192(no input) -> 8804 SPDIF out
Can I desolder the crystal from the 8804 that is operating in slave mode?

Thanks!

Edited by user Wednesday, October 14, 2015 6:02:07 PM(UTC)  | Reason: clarity

Russ White  
#8 Posted : Wednesday, October 14, 2015 9:15:09 PM(UTC)
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I can only refer you to the datasheets I really have not tried that scenario.
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