A multiplexer (or MUX) is an electronic device with multiple inputs (analog or digital) from which it can select one to forward as an output. In other words, a MUX allows a circuit to switch between inputs for a signal line. A MUX can reduce cost and part count in many applications by enabling multiple signals to “time-share” a single resource, such as an Analog-to-Digital Converter (ADC) or a microprocessor.
