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AD9272 DCO

Question asked by gordondobie on Dec 7, 2012
Latest reply on Dec 11, 2012 by gordondobie



I am evaluating the AD9272, using the AD9272-EBZ evaluation board.  When I scope the DCO_P vs DCO_N I see nothing on the scope (sample interval 5ns).  I can see a 40MHz on FCO.  I have disconnected the SPI jumpers so understand that the chip should be operating in default mode.  The oscillator is enabled.  There is nothing connected to the AD9272-EBZ, i.e. no data acquisition board.


Any ideas?


I was expecting to see something similar to Figure 63 in the AD9272 datasheet.


Thanks, Gordon