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Help with understanding how to configure AD5930

Question asked by lostinspacebar on Jul 24, 2013
Latest reply on Jul 11, 2014 by musach

Hi,

 

This might be a basic question, but I'm confused as to what kind of resolution is possible with the AD5930. Table 1 shows 10bits for resolution, but the FSTART and DeltaF registers are 24-bits long. But the chip itself can go up to 25MHz. And 24-bits can't quite count up to 25,000,000.

 

So what number am I supposed to be looking at? What is the number you actually set with the FSTART and DeltaF registers. Is it just the frequency as binary but with some part of the range chopped off / inaccessible? What's the shortest frequency increment I can sweep by?

 

My current application requires a sweep of about 1KHz.

 

Thanks,

Aditya

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