应用功能: 1-/2-/4-Channel Digital Potentiometers The AD8400/AD8402/AD8403 provide a single, dual or quadchannel, 256 position digitally controlled variable resistor (VR) device.These devices perform the same electronic adjustment function as a potentiometer or variable resistor. The AD8400 contains a singlevariable resistor in the compact SO-8 package.