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AD9858 Serial programming

Question asked by fussylogia on Mar 22, 2012
Latest reply on Mar 26, 2012 by DSB

Hi,

I'm trying to program an AD9858 through spi interface. However, it seems to be unsuccesfull. I am following below step:

 

Sent 8 bit instruction word-----(0x03) ;

Sent 4 byte FTW------------------(0x40 0x00 0x00 0x00); %this is for 250 MHZ frequency for 1GHZ clock

Make FUD high

Make FUD low

 

Is this programming scheme correct. Or what is the corect scheme and timing? Using above algorithm i canot program the 9858

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