AnsweredAssumed Answered

AD9833 Comms

Question asked by plasmaphase on Jan 28, 2013
Latest reply on Jan 30, 2013 by plasmaphase

I believe (though I'm not entirely sure) that I'm communicating to the AD9833 via SPI.  Below is the transmission I send to the device:

 

0x2100

0x50C7

0xC000

0x2000

 

setup_4.png

I expect the output clock to be 400Hz per the AN-1070 application note, but below is what I see out of the Vout:

 

setup_5.png

 

As you can see I have a frequency of around 3.33kHz.

 

I am currently powering the EVAL-AD9833SDZ board via the DVDD with 3.3V.  I have the LK2 jumper connected to Port B.  I am connected to SLK, SCLK, FSYNC, and DGND.  I am not feeding a clk beyond the SCLK.  Could that be the issue?  Any obvious flaws here?

Outcomes