The TMUX1101 or TMUX1102 switch is used in conjunction with the voltage holding capacitors (C_H) to implement the sample-and-hold circuit. The basic operation is:

1. When the switch is closed, it samples the input voltage and charges the holding capacitors (C_H) to the input voltage values.
2. When the switch is open, the holding capacitors (C_H) holds its previous value, maintaining stable voltage at the amplifier output (V_OUT).

Due to switch and capacitor leakage current, as well as amplifier bias current, the voltage on the hold capacitors droops with time. The TMUX1101 and TMUX1102 minimize the droops due to its ultra-low leakage performance. At 25°C, the TMUX1101 and TMUX1102 have extremely low leakage current of 3pA typical.

Refer to Sample and Hold Glitch Reduction for Precision Outputs Reference Design for more information on sample-and-hold circuits.