First developed about 25 years ago, integrated analog switches often form the interface between analog signals and a digital controller. This tutorial presents the theoretical basis for analog switches and describes some common applications for standard types. The special features of calibration multiplexers (cal-muxes), fault-protected switches, and force-sense switches are discussed as well. In recent years, integrated analog switches have offered better switching characteristics, lower supply voltages, and smaller packages. Because so many performance options and special functions are available, the well-informed product designer has a good chance of finding just the right part for a particular application.
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