The CS4299-BQ is an AC '97 2.1 compatible stereo audio codec designed for PC multimedia systems. Using the industry leading CrystalClear delta-sigma and mixed signal technology, the CS4299-BQ enables the design of PC 99-compliant desktop, portable, and entertainment PCs. Coupling the CS4299-BQ with a PCI audio accelerator or core logic supporting the AC '97 interface, implements a cost effective, superior quality, audio solution. The CS4299-BQ surpasses PC 99 and AC '97 2.1 audio quality standards.