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hanzibal 21st January 2012 07:24 PM

dir9001 problems
 
1 Attachment(s)
Hi all!

Im having problems with the attached circuit based on the DIR9001 96kHz s/pdif receiver from Texas. Problem is that xaudio=0 and error=1 all the time no matter what.

This is only kind of proof of concept and not nearly a final solution so there's no decoupling caps and I'm using the same vcc/vdd and dgnd/agnd respectively.

Can you see anything obviously wrong with the attached circuit?

SoNic_real_one 21st January 2012 07:41 PM

XTI should not be grounded, should be High (disconnected). Connect CKSEL to GND for PLL mode (or to ERROR for AUTO mode).

hanzibal 21st January 2012 07:53 PM

Quote:

Originally Posted by SoNic_real_one (Post 2872553)
XTI should not be grounded, should be High (disconnected). Connect CKSEL to GND for PLL mode (or to ERROR for AUTO mode).

Thanks, that was fast. According to specs, CKSEL is pulled internally pulled low but I'll give it try.

hanzibal 21st January 2012 10:17 PM

Disconnected GND from XTI and tied CKSEL to GND - no go. Tried CKSEL to ERROR but it still no go. Got any more ideas?

SoNic_real_one 21st January 2012 11:12 PM

The capacitors in the PLL loop are 10 time more than needed. Look in the datasheet at page 15 or 25 for values.

And yes, it might not work without the small decoupling caps.

kevinkr 21st January 2012 11:15 PM

Decoupling caps are also recommended.

hanzibal 21st January 2012 11:40 PM

Quote:

Originally Posted by hanzibal (Post 2872751)
Disconnected GND from XTI and tied CKSEL to GND - no go. Tried CKSEL to ERROR but it still no go. Got any more ideas?

Sorry, that was a typo - my C1 is actually 4n7F.

hanzibal 22nd January 2012 12:07 AM

2 Attachment(s)
Again sorry, there were more typos with the other caps - here's my currently updated schematics. I'm a total noob at this and it's my first time ever using Eagle.

The reason for the two paralleled caps making for 69nF together and two resistors adding up to 692R in series is that I didn't have the proper values - are these close enough, you think?

Attached is also a picture of the soldering, looks ok?

hanzibal 22nd January 2012 01:00 AM

Quote:

Originally Posted by kevinkr (Post 2872798)
Decoupling caps are also recommended.

Added some, didn't change anything.

SoNic_real_one 22nd January 2012 01:53 AM

Try to use some 0.1uF on power lines.
Some more help from Google:
http://electronics-diy.com/schematic..._Audio_DAC.jpg
http://circuits.datasheetdir.com/195...1-circuits.jpg


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