Codec switches between Class AB and Class D

Edinburgh, Scotland — Wolfson Microelectronics plc today announced what it claims is the first Class AB-to-Class D switchable stereo codec for portable applications.

Wolfson's WM8985 is targeted for use in mobile phones, MP3 players and wireless headsets. The codec has an integrated dual mode headphone driver, which is dynamically switchable between Class AB and Class D drivers. Class D increases efficiency by up to 70 percent while Class AB mode provides additional flexibility to the designer, said Nat Edington, Wolfson Microelectronics Business Unit Manager.

“The WM8985 is the first product of its kind on the market to tap into the need for both audio quality and power savings needed for today's consumer audio products, including radios, mobile phones and RF-transmitting portable players,” Edington said.

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

The WM8985 is sampling now in a 5 x 5 mm 32-pin QFN (pin compatible with 8976/8978). Volume is slated for Q2. The WM8985 codec is priced at $2.24 in 10,000-piece quantities. Click here for the WM8985 data sheet.

Wolfson Microelectronics , 1-858-676-5090,

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