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Codec expands portable features

Edinburgh, Scotland — Wolfson Microelectronics plc introduced a stereo codec for portable multimedia apps, including cellular phones — that is said to integrate high-quality audio performance and enhanced mixing capabilities, with low-power consumption.

The stereo-audio codec enables flexible new usage modes for mobile phones, the company said. These include initiating normal mobile phone functions while continuing to listen to MP3 or FM radio, as well as audio playback during calls, allowing the called party to hear playback as well as the caller's voice. Other modes include karaoke during voice calls, with full mixing capability for headphone playback as well as recording in I2S format.

The WM8983 high-resolution codec includes a dedicated input and output audio mixer with audio loopback for hi-fi recording, two microphone amplifiers, and output drivers for speaker, headphones and differential or stereo line outputs.

By integrating a five-band equalizer, 3D audio enhancement, automatic level control and record limiter, the on-chip DSP is able to reduce the Mips demand on the device’s main multimedia processor, for enhanced performance and lower overall power consumption.

Digital-to-analog converter (D/A converter) performance is 98 dB signal-to-noise ratio (SNR) and –84 dB total harmonic distortion (THD), while performance of the analog-to-digital converter (A/D converter) is 95 dB SNR and –84 dB THD. The WM8983 operates at analog supply voltages from 2.5 V to 3.3 V, although the digital core can operate at voltages down to 1.71 V.

The WM8983 is available to sample now in a 5mm x 5mm, 32-pin QFN package and is priced at $2.85 in 10,000-piece quantities.www.Wolfsonmicro.com.

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