When I was debugging the LDC1614, I found that the use of common mode inductors would affect the measurement performance of the LDC1614. Specifically, when the LDC1614 collected data under the same environmental changes, there was a relatively large standard deviation. However, when the LDC1614EVM was used for collection, the standard deviation of the data collected by the EVM under the same environment was relatively small. After comparing the PCB layout I drew with that of the EVM, I found that there was a common mode inductor close to the LDC1614 chip in my PCB layout, which had a significant impact on the performance of the LDC1614. Based on this, I would like to ask what aspects should be noted when laying out the PCB for the LDC1614, including the type of components, the placement of components, and even the distance, placement, and connection method of the LDC1614 coil?
