Resolver to Digital Converters (HSDC/HRDC27 Series) is the digital to synchro converters or resolver to digital converters for continuous tracking of type II servo loop, it parallelly latches and outputs 12-bit or 14-bit natural binary coded data with 32-line dual-in-line metal package, features the advantages of small volume, light weight and high reliability etc., it is widely applied in such automatic control system as Radar system, navigation system, etc. The operating power adopts ±15V and + 5V DC power. There are two types of output signal: three-line synchro and reference signal (SDC converter) or four-line resolver and reference signal (RDC converter); the output adopts parallel digital codes of binary system.