Stereo Power Amp Chip Creates 3D Audio Effects for Mobile Phone Platforms

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

ST’s analog 3D technology, which is integrated in the 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, minimizing 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 2.7V to 5.5V power supply, providing excellent immunity to supply interference with 85dB PSRR. Signal-to-noise ratio (SNR) is a high 106dB(A), and pop and click interference is suppressed. The device is part of ST’s large portfolio of audio amplifiers designed for portable applications such as mobile phones and laptop PCs.

The TS4997 is available now in a QFN16 4x4mm package, with 0.65mm pad pitch, priced at $1.20 in quantities of 1,000 pieces.