the output of ad9914 is abnormal

this is the specturm of ad9914 evaluation aboard

Hi xxKing ,

Yes, you're right. That's not how the output should look like. May I know what your setup looks like? What were your application aiming for? What expected output you wanted to see? Are you using an evaluation board or custom PCB? Thanks. 

All the best,

Jules

Q1.The setup of it has been attached under this answer

Q2.I just want to test the output of the board which should have a 500MHz wave

Q3.I want to have the output sine wave which is 500MHz

Q4.I am using the ad9914 evaluation board which is controlled by the evalution software

Few days ago, I could use the software to control the board and have a right output, but now I use the same settings but cannot make it have an output ; And I am considering that if the evalution board could have a problem? 

and here's the photo of the board

AD9914_Settings.stp.zip

Hi xxKing ,

Did you happen to get the board reworked or did some modifications? Also, when using the software, did it used to detect the board? 

All the best,

Jules

I don't make any  modifications or rework; when i use the software, the usb icon is green , so i guess the connection is right; but it really have no output; and when i click the cycle icon to read the board's registers; the register is all zero or full; which means the SPI communication didn't work.

Hi xxKing ,

I'm thinking the last resolution that I could give is to check the connections. Make sure your cables work fine and the pins are in the right position. Make sure each supply rails are receiving both 5V and 3.3 V respectively. Current should also give you at least 0.3 - 0.5 A. If these does not check the boxes, then it is safe to say it might have been broken. 

All the best,

Jules

The voltage of the board is right ,and if the board has broken,how i can fix it?

Hi xxKing ,

If you feel like you already checked all the pin connections and they are all connected, no shorted lines or anything, it might be that the IC is broken. You can remove the old one and install a new one. 

All the best,

Jules