STMicroelectronics Introduces Power-Saving Stereo Headphone Amplifier

STMicroelectronics, a leading provider of semiconductor solutions for mobile
devices, has introduced a stereo headphone amplifier IC that achieves
significantly higher efficiency than previous-generation devices, enabling
listeners to enjoy high-quality sound for longer between battery charges.

The TS4621 delivers the high audio performance of a traditional analog
amplifier, and saves power by operating from a lower supply voltage for the
majority of audio-signal levels. While connected to two supplies, power is drawn
from the higher-voltage rail for only those brief periods when peak audio power
levels are required. By using this principle, known as class G, the TS4621 is
among the first such headphone amplifiers targeting portable applications.

The TS4621 simplifies system design with features including an
industry-standard I2C interface enabling digital volume control from -60dB to
+4dB, and integrated switch-on/switch-off circuitry that eliminates pop and
click noise. Its ultra-small 1.65mm x 1.65mm chip-scale package allows the
amplifier to be positioned very close to the headphone connector for optimum
audio performance.

Joining ST’s portfolio of audio ICs targeting products such as cellphones,
multimedia and MP3 players, game terminals and GPS devices, the TS4621 has
four-times lower quiescent current consumption than the existing TS4601; a class
AB amplifier. This saving is valuable in energy-sensitive applications such as
battery-powered devices. At the same time, the TS4621 excels in key audio
performance parameters to deliver an outstanding listening experience for end

Major features of the TS4621:

  • 0.006% THD+N at 1kHz
  • 100dB PSRR at 217Hz (high immunity to GSM signaling noise)
  • 100dB SNR at 0dB gain
  • 0.6mA/channel quiescent current
  • 2.1mA/channel active current at 100microW audio output

The TS4621 is sampling to lead customers now and will be available for
production orders from April 2010, priced from $0.95 for orders over 1000 units.


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