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Audio CODECs enable great sound in portable multimedia products

Posted: 18 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:wolfson microelectronics? audio codec chip? codec? wm8980? wm8982?

Wolfson Microelectronics has announced a line of audio CODEC chips to address the increasing need for great sounding handheld multimedia. The new chips feature enhanced audio processing, a video buffer and a new powerful speaker driver and follow on from Wolfson's existing range of solutions for this market.

Two of the new Wolfson audio CODEC devices, the stereo WM8980 and the mono WM8982, feature a video buffer to allow direct connection to a television set for display of images. This feature, which is increasingly popular in a wide range of portable devices offering image-based as well as audio functions, previously required an external video op-amp.

The third device, the WM8978, is a full-featured stereo version of the WM8974 introduced in October 2004. The video buffer is designed to support both AC or DC coupled video connections and provides high quality video reproduction with an optional 6dB gain and 3rd order low pass filter architecture. With the current mode design, it eliminates the need for sag correction and large DC blocking capacitors.

The three new products feature DSP cores to filter wind noise and improve audio recording especially in video systems, a five-band equalizer with 3D audio enhancement to improve audio output and a programmable notch filter to eliminate zoom and focus motor noise.

The devices also include integrated PLLs supporting a frequency range from 12MHz to 19MHz. Integrated support for a differential or single-ended microphone and drivers for speakers and headphones further reduce component count in the final system.

The three CODECS produce up to 900mW of speaker power for high quality sound and are capable of driving piezo speakers. A digital playback limiter prevents excessive speaker output. The CODECS operate at power supplies as low as 2.5V for analogue and 1.62V for the digital core. The WM8978 and WM8982 both come in a 32-pin QFN package, while the WM8980 is available in 40-pin QFN package.

Electronics Express Europe

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