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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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WM8912 데이터시트(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8912 데이터시트(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 128 page  w WM8912 Ultra Low Power DAC with Headphone Driver for Portable Audio Applications WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews Production Data, September 2010, Rev 4.0 Copyright ©2010 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. ReTuneTM 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 Ω at <1% THD - 32mW per channel into 15 Ω 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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