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Wolfson has launched the world's first A/B to D convertible stereo codec. Targeted at mobile phones, MP3 players and wireless headsets, the WM8985 chip integrates a dual-mode headphone driver that dynamically converts between A/B and Class D drives. Class D technology can increase efficiency by up to 70%, while A/B class mode provides additional flexibility for designers.“Ou Sheng WM8985 is the first such product on the market. It also meets the audio quality and power saving requirements of today's consumer audio products including radios, mobile phones and RF transmission portable players.†Naosheng Microelectronics Business Manager Nat Edington said.
As Gartner analyst Stephen Ohr pointed out: "Class D amplifiers may only need a small fraction of their rated power to be audible. Just as A/B class amplifiers are a power-saving extension of Class A amplifiers, the whole The industry also wants to see Class D amplifiers as a power-saving extension of Class A/B amplifiers."
This high-performance codec is based on Wolfson's proven 897X platform and includes a built-in audio enhancement DSP for wind noise filters, notch filters, 5-band equalizers and 3D audio. The WM8985 supports up to two differential microphones and analog stereo line inputs, and supports a direct mix of FM radios with two pairs of headphone drivers to support two users on one audio player. An integrated phase-locked loop supports input clocks from 9 to 27 MHz.
The WM8985 is now available in a 32-pin QFN package (compatible with the WM8976/8978) and is priced at $2.24 in quantities of 10,000.
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