One application of the TMUX720x is to configure the feedback on a discrete transimpedance amplifier (TIA) implementation. Often, TIAs are used in applications such as photodiode inputs, which then feeds into an ADC or MCU/processor. Depending on the expected strength of the photodiode input, and the needed accuracy, multiple gain levels are needed. A switch like the TMUX720x allows for different gain values to be selected, changing the level of amplifications. This solution can be scaled, but as much as needed for multiple gain options.

Figure 9-1 shows the TMUX720x configured with a precision op amp to enable multiple gains.

Figure 9-1 TIA Feedback Control