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-   -   DIP adapter for PCM5201 (http://www.diyaudio.com/forums/digital-source/214785-dip-adapter-pcm5201.html)

kalinowski 19th June 2012 10:08 PM

micro PCM5102 DAC in DIP form
 
Hello,

I want to design a pcb for pcm5102 in a form of dip adapter. It will include all necessary power decoupling caps and some sort of switches for hardware configuration.
Here's a first quick draft:
http://f.cl.ly/items/3f260n1r4747050A0g41/pcm5102.png


First question:
I want to include voltage regulators for analog and digital rails. I am currently using mcp1703 but I'm pretty sure I can do better than that as far as output ripple is concerned. What ic would be the best for this application?

kalinowski 20th June 2012 10:52 PM

Not a lot interest in another pcm5102 dac. Just for the reference I decided to go with analog's adp151 regulators. Now looking for some proper i2c isolators. Funny, all i2c dedicated chips have only two channels while pcm needs three or four. Anyway, I'll be posting my progress in here.

5th element 20th June 2012 11:17 PM

That's because I2C =/= I2S.

I2C is a two wire communications protocol used for controlling ICs via software/micro controllers.

I2S is the three/four wire communications protocol used for transmitting digital audio data between ICs.

kalinowski 21st June 2012 07:30 AM

Ok, thanks for explanation. Can you recommend me a good isolator for i2s signals?

5th element 21st June 2012 04:39 PM

I've used these to good effect.

They obviously need powering from both sides though.

kalinowski 22nd June 2012 05:54 AM

thanks again 5th element. One more question about isolators: since you've said you used them on i2s bus, did you notice any increase in jitter? Did you do any measurements?

5th element 23rd June 2012 03:30 PM

I did do and couldn't see any problems. From what I've understood though, the amount of jitter that a clock buffer/isolator will add is very small and quite difficult to measure. That of course isn't to say that it isn't there, but I think you need quite specialist equipment to be able to detect the difference.

Perhaps one day I will daisy chain a number of devices and see if it ends up letting me see the degradation.

kalinowski 24th June 2012 04:53 PM

Here's what I came up with during the weekend:

Pinout:
http://f.cl.ly/items/3m331Z0t1d1n1m1D3F2o/pinout.png

Top layer:
http://f.cl.ly/items/323n1K2v3S233O382N2e/TOP.png

Bottom layer:
http://f.cl.ly/items/2e3i1F102n38160b0k2H/BOTTOM.png

I decided to not include isolation on the i2s lines after all. The module is pretty small, about 30x40mm and is designed to check out sound of pcm5102 dac. All the dac's control pins can be set either with dip switch or via external uC using pins of the module. Regulators are on by default, but can be switched off by shorting EN pins to ground. Let me know what you think.


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