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Class G headphone amp suits portable apps

Posted: 31 Mar 2010     Print Version  Bookmark and Share

Keywords:headphone amplifier  portable amplifier  analogue 

TS4621 amplifier

The TS4621 a stereo headphone amplifier IC joins STMicroelectronics portfolio of audio ICs targeting products such as cell phones, multimedia and MP3 players, game terminals and GPS devices. It 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 analogue 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 ultrasmall 1.65mm x 1.65mm chip-scale package allows the amplifier to be positioned very close to the headphone connector for optimum audio performance.

The TS4621 has 4x 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 users.

Additional features of the TS4621 include 0.006 per cent THD+N at 1kHz; 100dB PSRR at 217Hz (high immunity to GSM signalling noise); 100dB SNR at 0dB gain; 0.6mA/channel quiescent current; and 2.1mA/channel active current at 100µW audio output.

The TS4621 is sampling to lead customers now and will be available for production orders from April 2010, priced from Rs.43.87 ($0.95) for orders over 1,000 units.

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