ESS Sabre Reference DAC (8-channel) - Page 53 - diyAudio
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Old 23rd April 2008, 07:16 PM   #521
4real is offline 4real  Netherlands
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Quote:
Originally posted by peufeu
It sounds a bit marketspeak though.
Indeed it does. know-where is specified what this Zero Alias Filter is, and they talk about an issue with halfband filter, without telling what that issue would be... Furthermore there is no information on the actual performance of this new filter.
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Old 23rd April 2008, 07:42 PM   #522
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Peufeu,

Right, thats an error on page 16, so in case of doubt there is also the graph showing the PCM SHARP ROLL-OFF FILTER RESPONSE, and there one can notice the ~ 6-10 dB att. at 0.5 Fs, as is cited by Bruno.

The slow roll off is just that - ~no filtering at Nyquist freq.

But I'm far from criticizing - only wanted to clarify! It's up to the designer to decide, and obviously Dustin did not made a bad choice given the warm welcome from the listeners!

What regards the vanity, hope that the author will jump in!

And, given that it's not straightforward to use that board as a correct digital filter, if You think You can do something similar, but I2s in I2s out...

Ciao, George
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Old 23rd April 2008, 07:52 PM   #523
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Uhm,

Quote:
Allowing extra circuitry for encoding SPDIF (if he used the SPDIF core from opencores, this one uses lots of resources)
I would say not - knowing where he is coming from, I would very much expect some kind of SRDIF transmitter. That is, proprietary a la John Westlake..

Ciao, George
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Old 23rd April 2008, 09:12 PM   #524
NeoY2k is offline NeoY2k  France
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Hi everybody,

As I'm gonna start prototyping, I'll have to buy 5 Sabre DACs.
Boards from CustomPCB come by two, at least.

So I'll have 1 spare "eval board" (board with just the DAC, all things that can't be modified, and pin connectors for everything else), and 2 DAC's (I keep two for myself) as spares.

So people wanting DACs or an "eval board" with the DAC (I'd prefer to sell it non soldered, but I may cook the SMD for you), just tell me!
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Old 23rd April 2008, 09:21 PM   #525
peufeu is offline peufeu  France
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OK I take the chip.
What's your price for the board ?

Quote:
And, given that it's not straightforward to use that board as a correct digital filter, if You think You can do something similar, but I2s in I2s out...

Ciao, George
Uh,
- download Xilinx ISE free web edition
- write I²S encoder/decoder (done)
- write random number generator (done)
- instantiate Xilinx FIR filter core for filtering the audio
- instantiate Xilinx FIR filter core for shaping the noise
- a comparator for dither
- little bits of glue
- program chip
- you'll need a few HCT oc LCX chips to interface 3.3V and 5V signals and obviously some way to get a clean clock since the FPGA is a high-noise part.

It is a sunday afternoon project if you know Verilog and the Xilinx tools, if you need a cheap FPGA fast, get the one from SparkFun.

All the juicy bits are in designing the FIR filter. That is not a sunday afternoon project.

* of course the Vanity is more complicated since it handles DSD etc, but if you want a quick & dirty FIR, it's really easy since you can waste resources
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Old 23rd April 2008, 10:08 PM   #526
NeoY2k is offline NeoY2k  France
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For the board,
CustomPCB:
"2 PCB Soldermask & Silkscreen 78$"

So this is the price of the board, + 19$ for shipping.

So I'd sell you the board for 50$, half the price of 2 boards - I don't make any money on it. Plus you pay the shipping costs for me to send it to you. Would be 40$ without silkscreen, I don't know if I take it.

Price of the Sabre should be around 50$ if I remember correctly.
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Old 23rd April 2008, 10:11 PM   #527
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I believe the minimum order was 5 though.
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Old 23rd April 2008, 10:22 PM   #528
NeoY2k is offline NeoY2k  France
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I was talking about boards, not chips.
However if more people want boards it's no problem for me to buy several!

Oh, I forgot the price of the stencil (35$ inc shipping). And I'll stencil it.

EDIT:
I found this one:
http://www.pcbfabexpress.com

Way better! Cheaper and does boards any size I want.
And the more boards I order really cheaper it gets.

So how many people here would be interested?
Price would be:
- The Sabre (around 50$)
- The board (60$ if only 1 people wants one; 20$ if 4; even less if more)
- Stenciling (price of the stencil/number of people)
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Old 23rd April 2008, 10:40 PM   #529
xaudiox is offline xaudiox  Philippines
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Quote:
Originally posted by NeoY2k

If anyone knows any way to get cheaper boards...
check http://www.pcbcart.com/..
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Old 23rd April 2008, 11:04 PM   #530
peufeu is offline peufeu  France
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OK, so I will take 2 DAC chips. Thanks for the offer

As for the board, I need to see the layout first to check if it will fit in my current project.

Please contact me privately for arranging the transaction (PM on this site).

Check http://www.olimex.com/pcb/index.html
Very cheap for double sided.

Hey. This site says you're french from Lyon. J'habite dans le 7č, voilą qui serait pratique !
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