Analog Devices has filed a lawsuit in the United States District Court for the District of Massachusetts, in Boston, against Silicon Laboratories. The complaint alleges that Silicon Labs' Si84xx family of products infringe multiple U.S. patents addressing physical construction and signaling techniques related to ADI's iCoupler digital isolation products, and that SiLabs datasheets infringe the copyright on ADI datasheets for the iCoupler products. The complaint seeks unspecified damages and a court-ordered injunction against future infringement by Silicon Labs. In addition to its U.S. patents, Analog Devices has corresponding patent applications related to its digital isolation products pending in several countries.