WM8912 w Ultra Low Power DAC with Headphone Driver for Portable Audio Applications DESCRIPTION FEATURES 3.8mW quiescent power consumption for DAC to The WM8912 is a high performance ultra-low power stereo headphone playback DAC optimised for portable audio applications. DAC SNR 96dB typical, THD -86dB typical The device features stereo ground-referenced headphone Class W ground-referenced headphone driver amplifiers using the Wolfson Class-W amplifier techniques - - 28mW per channel into 30 at <1% THD incorporating an innovative dual-mode charge pump architecture - to optimise efficiency and power consumption - 32mW per channel into 15 at <1% THD during playback. The ground-referenced outputs eliminate headphone coupling capacitors. The outputs include Dynamic range controller common mode feedback paths to reject ground noise. ReTune Mobile parametric equalizer Control sequences for audio path setup can be pre-loaded and executed by an integrated control write sequencer to Integrated control write sequencer for pop minimised start- reduce software driver development and minimise pops and up and shutdown clicks via Wolfsons SilentSwitch technology. Single register write for default start-up and shutdown A dynamic range controller provides compression and level sequences control to support a wide range of portable recording applications. Anti-clip and quick release features offer good On-chip FLL provides all necessary clocks performance in the presence of loud impulsive noises. TM DAC supports standard sample rates from 8kHz to 96kHz ReTune Mobile 5-band parametric equaliser with fully programmable coefficients is integrated for optimization of speaker characteristics. 32-pin QFN package (4x4mm, 0.4mm pitch) Common audio sampling frequencies are supported from a APPLICATIONS wide range of external clocks, either directly or generated using the integrated FLL. Portable multimedia players Multimedia handsets The WM8912 can operate directly from a single 1.8V switched supply. For optimal power consumption, the digital Handheld gaming core can be operated from a 1.0V supply. WOLFSON MICROELECTRONICS plc Production Data, February 2013, Rev 4.1 Copyright 2013 Wolfson Microelectronics plc WM8912 Production Data BLOCK DIAGRAM PD, Rev 4.1, February 2013 w 2