This note shows how an X9312 can be used to implement a remote, adjustable regulator. The LM317 is probably the most common adjustable three- terminal voltage regulator in use today. Often it would be desirable to adjust these regulators remotely, but extending the adjustment rheostat any distance introduces noise and instability. Xicor’s X9312 XDCP can provide a simple solution. By using this XDCP, the voltage output of the LM317 can be set using a simple 3-wire digital interface over practically any distance.