STMicroelectronics developed a compact audio power amplifier chip - intended for mobile phones and for other 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 while its high-efficiency design and ultra-low standby power help to extend battery life.
With the device, no signal pre-processing is required, and it needs no external components to be added to the compact 4 mm square package, 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 10 nA per channel.
The amplifier chip operates on a 2,7 V to 5,5 V power supply, providing excellent immunity to supply interference with 85 dB PSRR. Signal-to-noise ratio (SNR) is a high 106 dB(A), and pop and click interference is suppressed.
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