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Send til en ven   Udskriv23/6 2011 kl. 15:41
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Low power D/A-konverter til audioapplikationer

Wolfson lancerer ny D/A konverter, der er optimeret med hensyn til lavt effektforbrug og højest mulige audiokvalitet i konsumerprodukter (in english).

Wolfson Microelectronics has announced the WM8918, its latest high performance ultra-low power stereo digital-to-analogue converter (DAC) which delivers superior audio to portable applications including mobile phones, tablet PCs, wireless headsets, multimedia players and handheld gaming devices.

The WM8918 features stereo ground-referenced headphone amplifiers, using Wolfsons Class-W amplifier and an innovative dual-mode charge pump architecture to optimise efficiency and power consumption during playback, eliminate AC coupling capacitors to reduce PCB area, BOM cost and also improve bass response.

The WM8918 also features Wolfsons SilentSwitch(TM) technology which minimises audible pops and clicks and shortens software driver development. The integrated dynamic range controller provides compression and level control to enhance the playback experience.

It can also be used to ensure high quality record performance when used to process signals captured by the on-chip digital microphone interface. The WM8918 also features Wolfsons ReTune(TM) Mobile 5-band parametric equaliser with fully programmable coefficients to optimise speaker characteristics and further enhance the playback experience.

With 3.8mW quiescent power consumption for DAC to headphone playback and a DAC signal-to-noise ratio of 96dB typical, the WM8918 can operate directly from a 1.8V switched supply. The digital core can also be operated from a 1.0V supply for optimal power consumption.

The WM8918 is available for sampling now in a 4mm x 4mm 32-pin QFN package.

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