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21st January 2012, 06:24 PM
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#1 |
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diyAudio Member
Join Date: Jan 2012
Location: Malmoe
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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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21st January 2012, 06:41 PM
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#2 |
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diyAudio Member
Join Date: Jan 2008
Location: Virginia
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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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21st January 2012, 06:53 PM
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#3 | |
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diyAudio Member
Join Date: Jan 2012
Location: Malmoe
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Quote:
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21st January 2012, 10:12 PM
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#5 |
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diyAudio Member
Join Date: Jan 2008
Location: Virginia
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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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21st January 2012, 10:15 PM
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#6 |
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diyAudio Moderator
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Decoupling caps are also recommended.
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www.kta-hifi.net |
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21st January 2012, 11:07 PM
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#8 |
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diyAudio Member
Join Date: Jan 2012
Location: Malmoe
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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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22nd January 2012, 12:53 AM
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#10 |
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diyAudio Member
Join Date: Jan 2008
Location: Virginia
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Try to use some 0.1uF on power lines.
Some more help from Google:  
Last edited by SoNic_real_one; 22nd January 2012 at 01:00 AM. |
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