The TMUX112x devices have a transmission gate topology, as shown in Figure 8-2. Any mismatch in the stray capacitance associated with the NMOS and PMOS causes an output level change whenever the switch is opened or closed.

The TMUX112x devices have special charge-injection cancellation circuitry that reduces the source-to-drain charge injection to -1.5pC at V_S = 1V as shown in Figure 8-3.

Figure 8-2 Transmission Gate Topology

Figure 8-3 Charge Injection vs Source Voltage