The WM8993 is a highly integrated, ultra low power hi-fi codec with a stereo 1 W per channel speaker driver that can operate in Class D or AB mode. Low leakage and high PSRR enable direct battery connection for the speaker supply and a Class W headphone drivers are ground referenced and provide a dramatic reduction in playback power. Active ground loop noise rejection and DC offset correction help prevent pop noise and ground noise from degrading headphone output quality. A highly flexible input configuration supports multiple microphone or line inputs (mono or stereo, single-ended or differential). A fully differential internal architecture, active ground noise rejection and on-chip RF filtering ensure a very high degree of noise immunity. ReTune™ Mobile provides powerful parametric equalization for optimizing speaker characteristics. Programmable dynamic range control is also available for maximizing loudness, protecting speakers from clipping and preventing premature shutdown due to battery droop.