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AD9826 strange waveform

Question asked by sborden on Oct 7, 2014
Latest reply on Oct 19, 2014 by sborden

We are using an AD9826 with an FFT-CCD detector.  All timing seems to be OK, but the data is unstable.  Attached is waveforms of the 9826 timing and the "right" side of the 0.1uF capacitor.  Any suggestions, anyone?  I have tried all sorts of timing combinations and can't seem to get anything stable.

 

Yellow line is RG

Burgundy is ADCCLK

Green is CDSCLK2

Magenta is CDSCLK1

Cyan is the capacitor "right" side

 

Notice the spike when ADCCLK transitions from high to low.

 

TEK00011.jpg

Here are some other "right" side waveforms for different timing arrangements.

TEK00012.PNG

TEK00014.PNG

Last image is for CDSCLK1 falling at same time as ADCCLK falling

TEK00013.PNG

 

Best regards,

Stuart Borden

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