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Old 27th July 2009, 03:55 AM   #11
acko is offline acko  Australia
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Join Date: Jan 2008
Location: Sydney, Australia
Originally posted by agent.5


If you have not finalized the DAC layout yet, I am just thinking that it may be nice to add one extra tiny hole connected to the clock output. This way, people will be able to easily use the clock output as a world clock to sync something else, say a CD player or Squeezebox or whatever.
Ok, will add this too. Will keep this design open for suggestions/feedback for another 2wks.
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Old 27th July 2009, 01:44 PM   #12
jkeny is offline jkeny  Ireland
Join Date: Feb 2007
Location: Dublin
Great to see someone else branching out & doing a fresh layout for the Sabre chips.

One thing - I have picked up that the power supplies to this chip are of huge importance & require careful consideration, particularly AVCC. Also advised to keep separate the supplies to the top & bottom padring (DVCC_T & B) - this way the clock feed does not have any perturbating activity to contaminate it!
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Old 3rd August 2009, 11:20 AM   #13
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all i can think of is producing some "solid" connection inbetween the IV and basePCB, sorta "sandwich" structure with solid copper connectors. The rest whats needed is only the uC side, like uploading filter coefficients from PC . Also , I never saw 4 pieces of SPDIF output anywhere , but I have a Lynx aes16 that has 8 pairs of AES/ebu outputs.
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Old 3rd August 2009, 04:41 PM   #14
glt is offline glt  United States
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Join Date: Oct 2004
It would be nice to be able to bypass the micro (Have header in the I2C lines) and use external micro such as Arduino
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Old 12th August 2009, 07:16 PM   #15
gorko1 is offline gorko1  Slovenia
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Location: SLO
acko,any news?

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Old 12th August 2009, 07:52 PM   #16
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maybe its the NDA thing... actually i became less and less interested since i actually try and sim 512 tap crossover filters, I suppose its the 44/48 > 88/96 stage that can be altered. 1-20khz bandpass = no chance ....
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Old 3rd September 2009, 04:08 PM   #17
orpheus is offline orpheus  United States
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Join Date: Jul 2004
Location: NYC
Interesting work, thank you for taking the time to put this board together. It would be great to be able to build a DAC with the Sabre. The Twisted Pear isn't really DIY since it's already built up, and the cost is a bit high compared to ordering the parts and stuffing the board yourself.

Are the Sabre chips readily available to individuals? The last I read, they were only sold in lots of 1000.

Thanks again, I look forward to your finished product.

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Old 9th September 2009, 10:39 PM   #18
Join Date: Mar 2009
Location: Atlanta, GA
I am totally excited about this, please tell me when the first ones are built. I will buy one.

What do you think the price for an assembled board would be?
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Old 4th October 2009, 10:48 AM   #19
acko is offline acko  Australia
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Join Date: Jan 2008
Location: Sydney, Australia
Hi Guys,

Thanks for all the valuable feedback. Sorry, I have been a bit busy with finalising this design (plus other projects) and trying to accomodate all your requests. A few more tweaks and tests to to go with the protoype but surely getting there, sounds really great! As for some for your queries:

1. Will make this as DIY as possible. You can also have the bare board and source/load components yourself. DAC chips can be bought in smaller quantities. I have got mine from Shaw Electronics, selling ~USD50 ea for 10, but you need to get NDA and proposal submitted first.

2. The IV board (in design) is separate will stack/solder directly on top of the dac board via headers. This will allow you to experiment with different IV to suit.

3. Final design will use ES9012-2Ch (instead of ES9018 -8Ch) as this appears to sound better for stereo. Unless there is request for 8 Ch version

4. Micro is external via I2C interface and has digital volume control option. Or could use Arduino etc.

5. Prices for boards, kit in progress. Plan to build 10 complete units initially. Also a custom enclosure to match

Anything else, let me know. regards, acko
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Old 4th October 2009, 10:54 AM   #20
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Join Date: Aug 2008
if I sign NDA Im goin to know more about the proposed crossover idea?
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