The AD1819 SoundPort Codec is designed to meet all requirements of the Audio Codec ’97, Component Specification, Revision 1.03, © 1996, Intel Corporation, found at www.Intel.com. In addition, the AD1819 supports multiple codec configurations (up to three per AC Link), a DSP serial mode, variable sample rates, modem sample rates and filtering, and built-in Phat Stereo 3D enhancement. The AD1819 is an analog front end for high performance PC audio, modem, or DSP applications. The AC ’97 architecture defines a 2-chip audio solution comprising a digital audio controller, plus a high quality analog component that includes Digital-to-Analog Converters (DACs), Analog-to-Digital Converters (ADCs) mixer and I/O. The main architectural features of the AD1819 are the high quality analog mixer section, two channels of ADC conversion, two channels of DAC conversion and Data Direct Scrambling (D2S) rate generators. The AD1819’s left channel ADC and DAC are compatible for modem applications supporting irrational sample rates and modem filtering requirements.