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VoIP codec delivers rich audio, voice

Posted: 14 Aug 2008 ?? ?Print Version ?Bookmark and Share

Keywords:mono audio codec? VoIP? DAC? ADC?

Nuvoton Technology Corp. has introduced the WAU8812, a cost-effective mono audio codec designed for VoIP phones, hands-free kits and general-purpose speakerphones. It delivers flexibility in performance and optimization of power consumption, while providing designers with development and test tools that can accelerate time to market, said the company.

Rich voice, audio
Under the emPowerAudio portfolio, the WAU8812 features a robust, high fidelity, 24bit signal architecture delivering 93dB DAC SNR and 91dB ADC SNR at audio sampling rates from 8kHz to 48kHz. The device operates at 6?A standby current, which greatly reduces power consumption and extends battery life in hand-held applications.

The codec reduces external component requirements by integrating a speaker driver, headset driver and a configurable low-noise, microphone-biasing circuit. It also includes two microphone inputs, a single auxiliary input and two dedicated analog outputs. The digital filter block includes a soft mute and a notch filter to reduce out-of-band noise. The WAU8812's speaker and mono outputs have a dedicated supply of 2.5V to 5.5V, which enable increased output power as required. Industry-standard digital interfaces include I?S and PCM with programmable time slot assignments. In addition, the codec is AEC-Q100-compliant for automotive applications.

The WAU8812's development platform and simple GUI development tools enable designers to efficiently generate new designs, giving them interactive programmability and predefined configuration paths for test and development.

The WAU8812 comes to market with a rich pedigree of voice and audio achievements. Nuvoton was founded earlier this year as a wholly owned subsidiary of Winbond Electronics Corp. Nuvoton's new emPowerAudio line extends that legacy and provides voice-based designs with unprecedented performance, power-consumption and time-to-market advantages.

"As one of the leading supplier of voice and audio solutions for more than 20 years, Nuvoton's new emPowerAudio family is designed to enable designers to successfully develop high-fidelity audio applications," said Ike Saeed, VP of marketing at Nuvoton. "The WAU8812 inaugurates the emPowerAudio family, which will expand into a broad range of devices for portable audio, in-vehicle infotainment systems and VoIP telephones. Voice and audio system designers can look forward to a steady stream of emPowerAudio products from Nuvoton for these applications."

The WAU8812 is available in a 28-SSOP and a 32-QFN (5mm x 5mm) package. The 32-QFN package supports read/write capability via SPI, 2-Wire. Samples and evaluation boards are available today. The packaged part is priced below $1 in quantities of 25,000.

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