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Old 21st December 2010, 05:46 PM   #1651
qusp is offline qusp  Australia
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ahh you are correct, its from 1 to 1.1 that was the big change (as you would expect). I had all three open (but I only remember ever getting 2) and only went off the size of the PDF file for amount of changes, late night lazy posting.

Last edited by qusp; 21st December 2010 at 05:50 PM.
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Old 21st December 2010, 11:50 PM   #1652
glt is offline glt  United States
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I figured that was what you thought you were referring to :-)
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Old 23rd December 2010, 03:15 PM   #1653
glt is offline glt  United States
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Default Issue with Sabre I2S Interface?

So far I have collected 6 reports regarding having issues with the I2S interface of the Sabre DAC:

1. Hiface Evo
2. TPA USB board based on the PCM2707 chip
3. Musiland MINI, based on Spartan FPGA
4. Teralink-X2 based on TENOR TE7022L and 1ppm TCXO
5. AudioGD ESS DAC
6. "Manufacturer X" converting I2S into SPDIF before feeding the DAC

More info here: Musiland MINI I2S to Buffalo II DAC H I F I D U I N O

The workaround seems to be increasing the DPLL bandwidth, although there is a report of having problems even at MAX dpll bandwidth. The other solution is to use the spdif interface which works fine at lowest dpll bandwidth.

It would be nice to get to the bottom of this. Any ideas?
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Old 23rd December 2010, 03:37 PM   #1654
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Quote:
Originally Posted by glt View Post
So far I have collected 6 reports regarding having issues with the I2S interface of the Sabre DAC:

1. Hiface Evo
2. TPA USB board based on the PCM2707 chip
3. Musiland MINI, based on Spartan FPGA
4. Teralink-X2 based on TENOR TE7022L and 1ppm TCXO
5. AudioGD ESS DAC
6. "Manufacturer X" converting I2S into SPDIF before feeding the DAC

More info here: Musiland MINI I2S to Buffalo II DAC H I F I D U I N O

The workaround seems to be increasing the DPLL bandwidth, although there is a report of having problems even at MAX dpll bandwidth. The other solution is to use the spdif interface which works fine at lowest dpll bandwidth.

It would be nice to get to the bottom of this. Any ideas?
With the Sabre32 DAC I can run the minimum DPLL bandwidth with 192k/24bit on SPDIF and 352.8k/32bit on I2S.

I do not know what "the" problem are, but I use the Sabre32 in Sabre32 modus and pinout.
Uses the SPDIF mux on DATA6, 7 and 8.
Uses the I2S with SPDIF disabled on DATA2, 3, 4 and 5.
Uses a 98.304MHz clock with less than 0.5ps jitter.
Uses JFET regulators etc...

Only the "000 No bandwidth" setting are not working, but I am not sure if it should work at the input rates I use or at all for that matter???
I can use all internal settings like normal/50k/60k/70k/slow/fast/OSF disable/enabled / quantizer 6/7/8/9bit etc...
Thus I would not expect that there are any internal causes to the problems as I have no DPLL issues with any internal settings.

Last edited by RayCtech; 23rd December 2010 at 03:55 PM.
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Old 23rd December 2010, 04:47 PM   #1655
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I honestly have never had any trouble with any clean I2S source keeping a lock on the lowest DPLL setting at any bit depth or sample rate. You do have to be very careful about the signal routing and GND returns. Even with the PCM2707 I don't have any issues.

I am not saying there may not be some issue, but if there it it is likely not the fault of the chip. More likely to find the problem looking at more basic design concerns.

Having thousands of working DACs out there I have only heard a handful of issue regarding I2S, and most of those were solved by simply using better routing and paying attention to GND return.

So not sure where you want to take the discussion. From a DIY perspective it is easy enough to use what ever DPLL BW you see fit.
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Old 23rd December 2010, 05:08 PM   #1656
jkeny is offline jkeny  Ireland
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Is this a problem with synchronisation/timing issues between he I2S lines - these lines need to be the same length?. I seem to remember somewhere that the Sabre DAC is particularly sensitive to this mis-timing!
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Old 23rd December 2010, 05:09 PM   #1657
glt is offline glt  United States
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Hi Russ,

Just curiosity from a "technical mind" as more reports keep popping up, nothing "evil" :-)
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Old 23rd December 2010, 05:25 PM   #1658
glt is offline glt  United States
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Quote:
Originally Posted by RayCtech View Post
With the Sabre32 DAC I can run the minimum DPLL bandwidth with 192k/24bit on SPDIF and 352.8k/32bit on I2S.

I do not know what "the" problem are, but I use the Sabre32 in Sabre32 modus and pinout.
Uses the SPDIF mux on DATA6, 7 and 8.
Uses the I2S with SPDIF disabled on DATA2, 3, 4 and 5.
Uses a 98.304MHz clock with less than 0.5ps jitter.
Uses JFET regulators etc...

...
RayCtech, thanks for sharing.

Based on your description, you can connect 3 spdif sources and 1 i2s source and select them in s/w? That's pretty cool.
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Old 23rd December 2010, 08:46 PM   #1659
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Quote:
Originally Posted by glt View Post
Hi Russ,

Just curiosity from a "technical mind" as more reports keep popping up, nothing "evil" :-)
No I would never think such. But I am just saying it is definitely not a common problem as far as I am aware.
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Old 24th December 2010, 12:06 AM   #1660
qusp is offline qusp  Australia
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try 8 spdif and 1 i2s, but I guess you can only have 6 and 1. but as I was telling RayCtech, you cannot switch i2s, anything playing on i2s will continue to play underneath any spdif channel you select, obviously you just stop it, but the connection is still there
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