1 Introduction

Modern systems often rely on numerous sensors to monitor various subsystems, making efficient signal processing essential. To manage and simplify the routing of signals from many sensors to an ADC, a typical design is to use a multiplexer. However, when the mux switches to different channels, a short delay occurs when the drain is floating causing the output signal to slightly drop. During this time the ADC continues sampling which can lead to an error if a sample occurs in this down period when the drain is floating. This application is often seen in automotive, specifically in zone & body control modules, which involves managing the overvoltage risk from short to battery conditions that exceed the mux voltage limitations. To protect this and reduce signal distortion, resistors and capacitors are implemented on the inputs, resulting in an increased RC delay. The TMUX1308-Q1 is commonly used for this use case due to the configuration. Recently the TMUX1308A-Q1 was released as a direct replacement, but with improved functionality; greatly reducing settling time and ADC error count.