资料介绍
Resistor potentiometers can be found in electronic cir-
cuits across a wide spectrum of applications. Most typ-
ically, they function in a voltage divider configuration in
order to execute various types of tasks, such as offset
or gain adjust. The two types of potentiometers com-
pared in this application note are the mechanical poten-
tiometer (also called a trimmer potentiometer) and the
digital potentiometer. The physical descriptions and cir-
cuit models of these two devices are shown in Figure 1. AN219
Comparing Digital Potentiometers to Mechanical
Potentiometers
Author: Bonnie C. Baker, Earlier mechanical potentiometers were built by wrap-
Microchip Technology Inc. ping a resistive wire around a cylinder. With this con-
struction, the wiper moves from one winding to the
next. As the wiper is moved across the element, there
INTRODUCTION are discrete steps in resistance. Following this style of
Resistor potentiom
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