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AD9834 output magnitude

Question asked by Huya on May 12, 2014
Latest reply on May 12, 2014 by LouijieC

Hi all,

 

I have a question about the output magnitude of AD9834.

 

I use two AD9834s and they worked fine, but one of them provides weird output suddenly.

 

scope_19.png

 

For the yellow wave, there's 47k ohm resistor at the FS ADJ pin, and for the green wave, there's 6.8k ohm resistor.

 

How can the green wave be 1.93V?

 

When I tested it, it was 500~600mVmax, but it was changed suddenly...

 

What can be the cause?

 

I need your help.

 

Thanks.

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