10.1 Layout Guidelines

Figure 30 and Figure 31 show an example layout for the LMP91002. Figure 30 shows the top layer, and Figure 31 shows the bottom layer. Figure 30 shows that the sensor electrodes may be arranged around the LMP91002 so that the sensor sets directly over the LMP91002, creating a compact layout. There are very few components needed for the LMP91002: one or more bypass capacitors attached to VDD, and one or two optional external components attached to pins C1 or C2 of the TIA that can provide extra filtering or gain. In the layout shown here, the VDD bypass capacitor is on the top layer, close to the LMP91002, while the optional components for the TIA are placed on the bottom layer. However, these components may also be placed on the top layer.

10.2 Layout Example

Figure 30. Layout Example – Top Layer

Figure 31. Layout Example – Bottom Layer