Figure 9-1 shows an application that demonstrates how the TMUX720x can be used to select the gain of a TIA amplifier. Here R_F is used to prevent any open loop configuration. For the lowest error, the R_ON of the switch should be much smaller than R_{F_S}, as this will scale linearly with the potential error.

The TMUX720x can support 1.8 V logic signals on the control input, allowing the device to interface with low logic controls of an FPGA or MCU. The TMUX720x can operate without any external components except for the supply decoupling capacitors. The select pin has an internal Pull-Down resistor to prevent floating input logic. All inputs to the switch must fall within the recommend operating conditions of the TMUX720x including signal range and continuous current. For this design with a positive supply of 15 V on V_DD and negative supply of -15 V on V_SS, the signal range can be 15 V to -15 V. The maximum continuous current (I_DC) can be up to 330 mA (for wide-range current measurement, see the Recommended Operating Conditions section).