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.
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