Digital parallel and serial converters change input streams of parallel data into output streams of serial bits, or vice versa. A digital parallel converter converts data in parallel form into a serial sequence of bits that are at same frequency. A serial converter is an interfacing device that is used to interconnect two serial standards such as USB to RS232. There are many different types of digital parallel converters and serial converters. Examples include a parallel to serial converter, serial to parallel converter, and an analog to digital converter (ADC).