STMicroelectronics has developed a compact audio power amplifier chip, intended for portable audio products, which creates 3D audio effects in the stereo speaker outputs to add impact and a surround-sound feel to MP3 and video files. The TS4997 can deliver 1,2 W per channel of continuous average output power into 8 Ω loads, from a supply range between 2,7 and 5,5 V, while its high-efficiency design and ultra-low standby power will help extend battery life. No signal pre-processing is required, and no external components need to be added to the compact package. 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 10 nA per channel. Signal-to-noise ratio (SNR) is 106 dB(A), and pop and click interference is suppressed. The TS4997 is available in a QFN16 4 x 4 mm package, with 0,65 mm pad pitch.
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