WM8904 Datasheet | Cirrus Logic

DESCRIPTION The WM8904 is a high performance ultra-low power stereo CODEC optimised for portable audio applications. The device Features stereo ground-referenced headphone amplifiers using the Wolfson ‘Class-W’ amplifier techniques incorporating an innovative dual-mode charge pump architecture - to optimise efficiency and power consumption during playback. The ground-referenced headphone and line outputs eliminate AC coupling capacitors, and both outputs include mon mode feedback paths to reject ground noise. Control sequences for audio path setup can be pre-loaded and executed by an integrated control write sequencer to reduce software driver development and minimise pops and clicks via Silent Switch™ technology. The analogue input stage can be configured for single ended or differential inputs. Up to 3 stereo microphone or line inputs may be connected. The input impedance is constant with PGA gain setting. A stereo digital microphone interface is provided, with a choice of two inputs. A dynamic range controller provides pression and level control to support a wide range of portable recording applications. Anti-clip and quick release Features offer good performance in the presence of loud impulsive noises. Re Tune TM Mobile 5-band parametric equaliser with fully programmable coefficients is integrated for optimization of speaker characteristics. Programmable dynamic range control is also available for maximizing loudness, protecting speakers from clipping and preventing premature shutdown due to battery droop. mon audio sampling frequencies are supported from a wide range of external clocks, either directly or generated via the FLL. The WM8904 can operate directly from a single 1.8V switched supply. For optimal power consumption, the digital core can be operated from a 1.0V supply. Features - 3.0m W quiescent power consumption for DAC to headphone playback - DAC SNR 96d B typical, THD -86d B typical - ADC SNR 91d B typical, THD -80d B typical - 2.4m W quiescent power...