Low distortion stereo headset amplifier

30 April 2008 Analogue, Mixed Signal, LSI

STMicroelectronics has announced a stereo headset amplifier optimised for feature-phone applications that offers enhanced audio performance, extended battery life and responsive user controls.

The TS4601's high power-supply rejection ratio of -107 dB prevents noise from the handset battery from reaching the audio output. As a result, the overall audio quality provided is close to that of a dedicated hi-fi system, while savings in overall current consumption allow end products to provide longer listening times and more functions for a given battery size. The sub 2-microamp stand-by mode is a further aid to frugal power management.

The low-profile flip-chip package measuring 2,1 x 2,1 x 0,6 mm allows designers to take advantage of the TS4601's enhanced features to create sleek, high-end mobile handsets offering advanced music features. The device can be used in many other portable and consumer products demanding high audio capabilities and system-level performance advantages, including MP3 players and notebook computers. User functions and configuration control are managed via the device's built-in I²C interface.

The TS4601's output is stable under all load conditions, which allows dependable glitch-free operation whether the user is listening via the headset or to an external hi-fi, via the phone output. In addition, built-in common-mode sensing automatically compensates for variations in headset characteristics, such as different grounding properties that may otherwise produce increased noise. Thermal shutdown and short-circuit protection are also embedded, providing mobile users with safety features typically implemented in dedicated audio equipment.

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