Stereo codec switches between Class A/B and D -

Stereo codec switches between Class A/B and D

A Class A/B-to-Class D switchable stereo codec is now available from Wolfson Microelectronics. The WM8985 is targeted for use in mobile phones, MP3 players, and wireless headsets and has an integrated dual-mode headphone driver, dynamically switchable between Class A/B and Class D drivers. Class D increases efficiency by up to 70% while Class A/B mode provides additional flexibility to the designer.

The high-performance codec is based on the company's 897X platform and includes a built-in audio-enhancement DSP for wind noise filter, notch filter, five-band equalizer, and 3D audio. The WM8985 supports up to two differential microphone and analog stereo line inputs, enabling direct mixing from an FM radio, and has two pair of headphone drivers enabling two users on the same audio player. An integrated PLL supports input clock between 9 to 27 MHz.

The WM8985 is sampling now in a 32-pin QFN 5X5 (pin to pin compatible with 8976/8978), priced at $2.24 in volumes of 10,000. For more information, visit

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