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The question of using Visual Analog to evaluate AD9874

Question asked by zjjxt on Mar 19, 2018
Latest reply on Mar 27, 2018 by zjjxt

I have downloaded the ADI Visual Analog Software and AD9864_74 SPI GUI to evaluate the AD9874. I use the test conditions as below:

IF =15.75MHz, -12dBm
LO=18MHz, 1 vp-p
the AD9874 registers are setting as below:

I use the Visual Analog software, the AD9874_16b average FFT, the data capture is setting as below:

And the result is as below, why result looks so bad?

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