JAJSJI8E November 2020 – July 2024 TMUX6208 , TMUX6209
PRODUCTION DATA
Figure 8-1 shows that the TMUX620x have a transmission gate topology. 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 TMUX620x contain specialized architecture to reduce charge injection on the Drain (D). To further reduce charge injection in a sensitive application, a compensation capacitor (Cp) can be added on the Source (Sx). This will ensure that excess charge from the switch transition will be pushed into the compensation capacitor on the Source (Sx) instead of the Drain (D). As a general rule of thumb, Cp should be 20x larger than the equivalent load capacitance on the Drain (D). Figure 8-2 shows charge injection variation with different compensation capacitors on the Source side. This plot was captured on the TMUX6219 as part of the TMUX62xx family with a 100pF load capacitance.