I found the ad9833 have the 50~60HZ noise on the output. How do I fix it? Here is my setup information.
Do you have a schematic of your board ? Also do you have scope plots of this noise ?
Here you are.
I noticed you don't have any low ESR 1uF to 10uF caps to decouple the supplies. These are used to filter out low frequency ripple. Might be worth adding these to your solution. See Figure 34 on datasheet for details.
We add the 10uF on the PIN2 but still could see the noise on the output.
Maybe including on the MCLK pin also. Otherwise the layout seems to be the issue. Check groundings etc.
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