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Formatting ADC data in blackfin

Question asked by les.humphris@gmail.com on May 15, 2014
Latest reply on Aug 11, 2014 by SachinV

Hi,

 

Currently, I am working with the BF526 EZ-KIT. I have an AD9629 eval board streaming 12-bit data in to the BF through the PPI ports. The data is being captured in memory via DMA, and I am plotting the ADC data to display the input signal (which is a sinewave  Fc = 1.02MHz, Fs = 1MHz). The problem is when I plot the data in CCES the sinewave is only observed at low input signal strengths (around -25dbm). when increased to near full scale input power the plotted sinewave then "wraps around" at the sinewave peak shown in the graph attached.

 

The data transfer type is 16-bit. I'm not sure but I think the problem could be something to do with the data alignment. Could anyone suggest how to debug this problem?

 

Kind regards,

Les.

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