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Old 21st January 2012, 06:24 PM   #1
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Default dir9001 problems

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?
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Old 21st January 2012, 06:41 PM   #2
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XTI should not be grounded, should be High (disconnected). Connect CKSEL to GND for PLL mode (or to ERROR for AUTO mode).

Last edited by SoNic_real_one; 21st January 2012 at 06:47 PM.
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Old 21st January 2012, 06:53 PM   #3
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Quote:
Originally Posted by SoNic_real_one View Post
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.
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Old 21st January 2012, 09:17 PM   #4
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Disconnected GND from XTI and tied CKSEL to GND - no go. Tried CKSEL to ERROR but it still no go. Got any more ideas?
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Old 21st January 2012, 10:12 PM   #5
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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.

Last edited by SoNic_real_one; 21st January 2012 at 10:26 PM.
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Old 21st January 2012, 10:15 PM   #6
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Decoupling caps are also recommended.
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Old 21st January 2012, 10:40 PM   #7
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Originally Posted by hanzibal View Post
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.
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Old 21st January 2012, 11:07 PM   #8
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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?
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File Type: gif dir9001.GIF (18.8 KB, 227 views)
File Type: jpg dir9001_lodning.JPG (83.5 KB, 225 views)
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Old 22nd January 2012, 12:00 AM   #9
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Originally Posted by kevinkr View Post
Decoupling caps are also recommended.
Added some, didn't change anything.
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Old 22nd January 2012, 12:53 AM   #10
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Try to use some 0.1uF on power lines.
Some more help from Google:
Click the image to open in full size.
Click the image to open in full size.

Last edited by SoNic_real_one; 22nd January 2012 at 01:00 AM.
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