AD5941 4-Layer PCB Review
Hello everyone!
I recently finished designing my first 4-layer PCB, and before I send it off for fabrication, I would really appreciate some experienced eyes on it.
The board is based around the AD5941 and is intended for an Electrochemical Impedance Spectroscopy (EIS) experiment. I designed it myself primarily because the commercially available development/evaluation boards are expensive and relatively large for our application.
This is my first time designing a 4-layer board, and while I have tried to follow the AD5941 datasheet and evaluation-board recommendations as closely as I could, I am sure there are things I have overlooked.
In particular, I would be interested in hearing from anyone who has worked with the AD5940/AD5941 IC.
I have attached the schematic and PCB layout. Please feel free to point out anything that looks wrong, even if it seems minor. I would much rather catch a mistake now than discover it after receiving a box of useless PCBs.
NOTE: The Back Copper layer is used to separate the AGND and DGND regions. They are kept separated on this layer and ultimately connect at the GND layer.
I don’t have any prior experience designing mixed-signal circuits, so I have tried to follow the AD5941 datasheet, schematic available on the Analog Devices website and other layout recommendations as closely as possible.
I would especially appreciate any feedback on whether my approach to the analog/digital grounding is appropriate.