The AN22011A incorporates such functions as RF signal processing, servo signal processing, ADIP signal processing and laser control. This is an RF IC that can constitute the MD system using 3-beam pick-up in combination with the digital signal processing LSI MN66621. The IC allows us to achieve a considerable low power dissipation as well as its low supply voltage operation (VCC = 2.1 V to 3.6 V) due to our introduction of digital matrix (PD = 11 mW at VCC = 2.1 V). The IC can be used in a wide range of applications from a stand-alone system to a portable system.