The AD1881 is the first audio Codec to meet the Audio Codec ’97 2.0 and 2.1 Extensions. In addition, the AD1881 SoundMAX® Codec is designed to meet all requirements of the Audio Codec ’97, Component Specification, Revision 1.03, © 1996, Intel Cor-poration, found at www.Intel.com. The AD1881 also includes some other Codec enhanced features such as communicating to three Codecs on the same link, a DSP serial port mode, modem sample rates and filtering, and built-in Phat Stereo 3D enhancement.