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robot  
#1 Posted : Sunday, April 24, 2011 6:53:11 PM(UTC)
robot

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Hi there,

can anyone tell me if this data is acceptable? My DAC is giving me a digital signal on the audio output. Data and FS signals are perfect but the BCK seems pretty f****d.

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Edited by user Sunday, April 24, 2011 6:55:40 PM(UTC)  | Reason: Not specified

Russ White  
#2 Posted : Monday, April 25, 2011 2:42:16 PM(UTC)
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Not sure what to tell you here. Its coming directly from the WM8804, you may need to add some series resistance if your probes present a capacitive load.

Try say 100R.

Also its difficult to say since I have no details of your test setup which is f****d your measurment or the output. :)
robot  
#3 Posted : Monday, April 25, 2011 4:40:27 PM(UTC)
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thanks for the reply Russ,

I tried 100R in series with similar results.

I removed the WM8804 from the DAC and have it running separately using the optical module and 3 AA batteries as a power supply. I'm using A 12 Mhz BW scope.
Russ White  
#4 Posted : Monday, April 25, 2011 8:28:23 PM(UTC)
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Honestly your at the end of the useful limits of your scope for this type of measurement.
robot  
#5 Posted : Tuesday, April 26, 2011 10:03:50 AM(UTC)
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i tested it with a 200 Mhz scope today and it seems fine. back to trouble shooting. Think
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