Figure 11-1 and Figure 11-2 shows an example of a PCB layout with the TMUX7436F. The following are some key considerations:
- Decouple the VDD and VSS pins with a
1-μF capacitor, placed as close to the pin as possible. Make sure that the
capacitor voltage rating is sufficient for the VDD and
VSS supplies.
- Multiple decoupling
capacitors can be used if their is a lot of noise in the system. For
example, a 0.1-μF and 1-μF can be placed on the supply pins. If multiple
capacitors are used, placing the lowest value capacitor closest to the
supply pin is recommended.
- Keep the input lines as short as possible.
- Use a solid ground plane to help distribute heat and reduce
electromagnetic interference (EMI) noise pickup.
- Do not run sensitive analog traces in parallel with digital
traces. Avoid crossing digital and analog traces if possible, and only make
perpendicular crossings when necessary.