Another PCM1730 based DAC

JensRasmussen · 24th May 2006, 02:03 PM

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.

I’m 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

UrSv · 24th May 2006, 02:10 PM

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...

lykkedk · 25th May 2006, 07:50 AM

Look's great Jens.

Looking forward to follow your'e project...

BTW: where do you buy theese DAC 'chips' ?

rfbrw · 25th May 2006, 08:09 AM

CS8414/PCM1730 Dac.

cviller · 25th May 2006, 09:12 AM

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.

JensRasmussen · 25th May 2006, 10:49 AM

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

cviller · 25th May 2006, 12:09 PM

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?

JensRasmussen · 25th May 2006, 12:24 PM

Quote:

Originally posted by cviller
Are you making the same psu as lars did?

Nope!

\Jens

ezkcdude · 25th May 2006, 12:45 PM

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!

JensRasmussen · 25th May 2006, 01:33 PM

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

24th May 2006, 02:03 PM	#1
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	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. I’m 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

24th May 2006, 02:10 PM	#2
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	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... __________________ UrSv Those who say it can't be done should not stop those who are doing it.

25th May 2006, 07:50 AM	#3
lykkedk diyAudio Member Join Date: Dec 2002 Location: Denmark, Fredericia	Look's great Jens. Looking forward to follow your'e project... BTW: where do you buy theese DAC 'chips' ? __________________ DIYAudio crazy.... LeachAmp, PearlPhono, Pumpkin, F4 DualMono, DDDac, HalfChang Spk., LinuxAudio, Squeezebox substitute, Drek inductorloaded pre-amp.

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25th May 2006, 08:09 AM	#4
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	CS8414/PCM1730 Dac.

25th May 2006, 09:12 AM	#5
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	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.

25th May 2006, 10:49 AM	#6
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	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

25th May 2006, 12:09 PM	#7
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	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?

25th May 2006, 12:45 PM	#9
ezkcdude diyAudio Member Join Date: Dec 2005 Location: Atlanta	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!

25th May 2006, 01:33 PM	#10
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	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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