The AD1881A meets the Audio Codec ’97 2.0 and 2.1 Extensions. In addition, the AD1881A SoundMAX Codec is designed to meet all requirements of the Audio Codec ’97, Component Specification, Revision 1.03, © 1996, Intel Corporation, found on Intel's web site. The AD1881A also includes some other Codec enhanced features such as the built-in PHAT Stereo 3D enhancement. The AD1881A is an analog front end for high performance PC audio 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 AD1881A are the high quality analog mixer section, two channels of ΣΔ ADC conversion, two channels of ΣΔ DAC conversion with Data Direct Scram-bling (D2S) rate generators. The AD1881A’s left channel ADC and DAC are compatible for modem applications supporting irra-tional sample rates and modem filtering requirements. * Four Analog Line-Level Stereo Inputs for Connection from LINE,CD,VIDEO,and AUX * Two Analog Line-Level Mono Inputs for Speakerphone and PC BEEP * Mono MIC Input Switchable from Two External Sources * High Quality CD Input with Ground Sense * Stereo Line-Level Output * Mono Output for Speakerphone or Internal Speaker * Power Management Support * Mobile Low Power Mixer Mode * Digital Audio Mixer Mode * Full Duplex Variable 8 kHz to 48 kHz Sampling Rate with 1 Hz Resolution