| Products : CODECs |
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| WM8903 |
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Further information |
| Ultra low power CODEC for portable audio applications | |
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FEATURES
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DESCRIPTION
The WM8903 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 outputs eliminate headphone coupling capacitors. Both headphone and line 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 sequencer to reduce software driver development and eliminate pops and clicks via Wolfson’s SilentSwitch™ technology. The analogue input stage can be configured for single ended, pseudo-differential or fully 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, which can also be mixed with the mic/line signals at the output mixers. 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. Common audio sampling frequencies are supported from a range of external clocks, including 3MHz, 12MHz or 24MHz. The WM8903 can operate directly from a single 1.8V switched supply. For optimal power consumption, the digital core can be operated from a 1.2V supply. |
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DATA SHEET WM8903 Product Brief Rev 2.0 (245 k ) PRODUCT FLYER WM8903 Product Flyer RELATED PRODUCTS WM8900 WM9001 WM8903 WM8990 APPLICATION NOTES Application Mobile handsets PRESENTATIONS The fine art of caplessness LINUX SOFTWARE Click here for more information
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