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WM8912 Datasheet(PDF) 1 Page - Cirrus Logic |
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WM8912 Datasheet(HTML) 1 Page - Cirrus Logic |
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1 / 129 page  w WM8912 Ultra Low Power DAC with Headphone Driver for Portable Audio Applications WOLFSON MICROELECTRONICS plc Production Data, February 2013, Rev 4.1 Copyright 2013 Wolfson Microelectronics plc DESCRIPTION The WM8912 is a high performance ultra-low power stereo DAC 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 outputs eliminate headphone coupling capacitors. The outputs include common 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 Wolfson’s SilentSwitch™ technology. A dynamic range controller provides compression 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. ReTune TM Mobile 5-band parametric equaliser with fully programmable coefficients is integrated for optimization of speaker characteristics. Common audio sampling frequencies are supported from a wide range of external clocks, either directly or generated using the integrated FLL. The WM8912 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 3.8mW quiescent power consumption for DAC to headphone playback DAC SNR 96dB typical, THD -86dB typical Class W ground-referenced headphone driver - 28mW per channel into 30 at <1% THD - 32mW per channel into 15 at <1% THD Dynamic range controller ReTune™ Mobile parametric equalizer Integrated control write sequencer for pop minimised start- up and shutdown Single register write for default start-up and shutdown sequences On-chip FLL provides all necessary clocks DAC supports standard sample rates from 8kHz to 96kHz 32-pin QFN package (4x4mm, 0.4mm pitch) APPLICATIONS Portable multimedia players Multimedia handsets Handheld gaming |
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