The DAC88 monolithic COMDAC D/A Converter provides a 15-segment linear approximation to the Bell System µ-255 companding law. The law is implemented by using three bits to select one of eight binarily-related chords (or segments) and four bits to select one of sixteen linearly-related steps withing each chord. A sign bit determines signal polarity and an encode/decode input determines the mode of operation. * Conforms with Bell System µ-Companding Law * Multiplying Reference Inputs * Meets D3 Compandor Tracking Specifications * Simplifies PCM System Designs * Both Encode and Decode Capability