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Amplifier creates 3D audio in stereo speakers

Posted: 05 Jun 2007     Print Version  Bookmark and Share

Keywords:3D audio  audio power amplifier  3D. mobile phones 

STMicroelectronics has introduced a compact audio power amplifier chip that creates 3D audio effects in the stereo speaker outputs to add impact and a surround-sound feel to MP3 and video files. Designed for mobile phones and for other portable audio products; the TS4997 can deliver 1.2W per channel of continuous average output power into 8Ω loads, from a 5V supply although it operates from supplies of as little as 2.7V. Meanwhile, its high-efficiency design and low standby power also helps extend battery life, said ST.

Mobile phones increasingly offer media features such as FM radio, MP3 player, video player and videophone. TS4997 is a suitable solution that can enhance the performance of such functions, aside from providing a high-quality stereo amplifier. It delivers an advanced stereo effect from a very small platform, and is also suitable for PDAs and for other portable audio devices.

ST's analogue 3D technology, which is integrated in TS4997, is the simplest in the market��no signal pre-processing is required and it needs no external components to be added to the compact 4mm square package, thus minimising space requirements and ensuring low production cost. A two-pin digital interface controls the 3D effect through independent gain adjustments for each audio channel, while additional left and right channel standby mode pins allow the supply current to be cut to less than 10nA per channel.

The amplifier chip operates on a 2.7-5.5V power supply, providing high immunity to supply interference with 85dB PSRR. SNR is a high 106dB(A) and pop and click interference is suppressed.

TS4997 is available now in a QFN16 4-by-4mm package, with 0.65mm pad pitch, priced at Rs.50.72 ($1.20) in quantities of 1,000 pieces.

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