The R2A20152 is an integrated circuit semiconductor of CMOS structure with 2 channels of built in D/A converters with output buffer operational amplifiers. It is the characteristic improvement version of M62332. The input interface is I²C Bus serial data method, and connects with a microcomputer with minimum wiring. It conforms FAST-MODE of I²C BUS Specifications. The output circuit is composed of buffer operational amplifier with sync and source drive capacity of 1. 0 mA or more, and it operates in the whole voltage range from VCC to ground.