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Build Your Own Function Generator Using Analog Devices’ AD9833

Build Your Own Function Generator Using Analog Devices’ AD9833

Ideally, this circuit should be built on a PCB designed specifically for this application and not on a prototype board. I will provide you with an already designed PCB in KiCad via the files below. However, if you want to make your own, keep these things in mind:



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  • Place the decoupling capacitor for all of the integrated circuits as close as possible to the power supply pins.
  • Try to use a ground plane (if using only two layers, make the bottom layer to consist mostly of ground).
  • Separate the analog part of the circuit (the output of the AD9833, the amplifying circuit, and the output BNC connector) from the digital part (microcontroller and communication side of the AD9833). You can split the ground plane right below the AD9833. This can be done easily as the IC has two separate pins for analog and digital ground.
  • As the datasheet of the AD9833 suggests, avoid running digital traces under the AD9833.

All the necessary components to build this can be found in the BOM included in the zip file at the bottom of the article.

Now that we are done with building the circuits let’s dive into programming.

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