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Ultralow-power audio DAC extends playback time

Posted: 01 Feb 2010 ?? ?Print Version ?Bookmark and Share

Keywords:audio DAC? amplifier? capacitor?

WM8912 DAC

From Wolfson Microelectronics comes the WM8912, an ultralow-power DAC designed to significantly extend playback time, reduce system cost and dramatically enhance audio performance in portable applications, including media players, headsets, multimedia phones and navigation devices.

The WM8912 is the latest addition to the company's portfolio of ultralow-power audio solutions, delivering Wolfson-quality audio performance and low-power consumption in an ultrathin, cost-competitive package.

The WM8912 features Wolfson's SmartDAC technology, a low-power DAC capacitor switching architecture, which enables DAC to headphone power consumption of less than 4mW. Also incorporated into the WM8912 is Wolfson's Class W amplifier technology, an evolution of class G, which includes an adaptive dual drive charge pump and DC servo circuit architecture.

The Class W ground referenced amplifier technology uses an adaptive dual drive charge pump to optimize power dissipation and eliminate the need for large DC blocking capacitors on both headphone and line outputs, resulting in significant savings in PCB space and the audio subsystem BOM.

The WM8912 also features a control write sequencer to ensure ease of system design by enabling and disabling the DAC with a single register write. Flexible clocking options are provided by a low power Frequency Locked Loop. A programmable dynamic range controller compresses the output signal, ensuring maximum volume is achieved when desired. Used in conjunction with ReTune Mobile parametric equalizer, the WM8912 offers powerful features to optimize the performance of an output transducer, such as a headphone or speaker. The total package allows consumer electronics designers to develop highly differentiated end products at a reduced cost.

Duncan Macadie, Wolfson's low power audio product line manager said: "The WM8912 brings together the key features required by system designers in one complete solutionlow component count, ultra low power consumption, increased battery life and world-class audio " all in a cost competitive package."

The WM8912 is available for sampling now in a 32-pin 4x4 mm QFN package. In 1K quantities, the WM8912 is priced at $1.52.

WM8912 customer evaluation boards with the Wolfson Interactive Setup and Configuration Environment (WISCE) are available to aid device evaluation and development. WISCE connects to the evaluation board over USB and offers a unique interactive register map interface. This interface provides unprecedented control and overview of the device settings.

- Green SupplyLine





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