8.7 Layout Recommendation

This section provides a brief description of layout hints for a proper system design.

The PCB layout requirements for MXG3141 follow the general rules for a mixed signal design. In addition, there are certain requirements to be considered for the sensor signals and electrode feeding lines.

A two layer PCB layout is sufficient to enable analog and digital signals to be separated from each other to minimize crosstalk. The individual electrode feeding lines should be kept apart as far as possible from each other.

V_DD lines should be routed as wide as possible.

MXG3141 requires a proper ground connection on all V_SS pins, including the exposed pad.

PCB RXn feeding lines are extremely sensitive to external electric fields. They must be kept as short and straight as possible. Track width must be the minimum allowed by the process used. RXn tracks must be kept at least 2 mm distant from any other kind of signal (power supply, analog, digital) and must not cross over other signals. Keep a minimum of 1 mm between every RXn line. To avoid strong signal attenuation, ground planes below RXn lines must be completely avoided if possible. And they must be kept at a minimum of 1.2 mm distance.