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Old 24th May 2006, 03:03 PM   #1
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Default Another PCM1730 based DAC

Hello All,

I have started work on my first ever DAC.

After searching I decided to use the CS8414 S/P DIF receiver and the PCM1730 DAC.

Iím unsure if I have missed anything in the datasheets, so I would like you to review my preliminary schematics.

Any input it welcome.

Thanks

\Jens

Go here for schematics www.delta-audio.com/temp_jens/dac.pdf
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Old 24th May 2006, 03:10 PM   #2
UrSv is offline UrSv  Sweden
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Sounds like a great idea and something I planned on doing myself but never managed to start and much less finish.

I've still got my 1730s lying around. I'll trade you for a PCB in case you need one...
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Old 25th May 2006, 08:50 AM   #3
lykkedk is offline lykkedk  Denmark
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Look's great Jens.

Looking forward to follow your'e project...

BTW: where do you buy theese DAC 'chips' ?
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Old 25th May 2006, 09:09 AM   #4
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CS8414/PCM1730 Dac.
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Old 25th May 2006, 10:12 AM   #5
cviller is offline cviller  Denmark
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Hi Jens,

I'm working on a similar project Comments on my cs8416 pcm1730 dac project , but with cs8416.

I think you might have connected the FMT to 20bit Standard instead of 24bit I2S. Your schematics are so much cleaner than mine. It is a really good idea to rearrange the symbol, so related pins are close to each other - maybe I should adopt that.

Have you considered reclocking? I can't decide if I should go for a reclocking and sample rate conversion approach or rely on the recievers pll.
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Old 25th May 2006, 11:49 AM   #6
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Hi,

Thanks for your comments.

I have used this setup:
FMT2 = 1
FMT1 = 0
FMT0 = 1

I think this sets I2S 24 bit mode..... I think that this also supports 16 bit mode (Not sure though but it is what Lars did in his DAC).

I will not do any reclocking it my first attempt...maybe second time arround.

If you use eagle I can offer you some of my lib files

\Jens
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Old 25th May 2006, 01:09 PM   #7
cviller is offline cviller  Denmark
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Sorry, you are right!

Thanks, but I'm not using eagle. I'm an open source kinda guy , but some times I have to pay by getting used to a crazy GUI. I'm using gschem, and I don't really like it, but the layout part called "pcb" is actually quite good.

Are you making the same psu as lars did?
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Old 25th May 2006, 01:24 PM   #8
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Quote:
Originally posted by cviller
Are you making the same psu as lars did?
Nope!

\Jens
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Old 25th May 2006, 01:45 PM   #9
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Jens, where did you get the value 22R for R8,11,13,14? Also, you may want to add a parallel cap on pin 20 (FILT), since you're relying on as clean a recovered clock as possible. That's what the data sheet for CS8416 recommends, and I would imagine it applies to CS8414 as well. Good luck!
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Old 25th May 2006, 02:33 PM   #10
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Hi,

The 22 Ohm is a guess, I will have to test IRL and pick the optimal value from the test results.

Thanks for the tip on the parallel cap - I can not find that in the datasheet.

\Jens
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