Stereo Headset Amp promotes feature-phone audio quality.

Press Release Summary:

Supplied in 2.1 x 2.1 x 0.6 mm flip-chip package, TS4601 offers typical power-supply rejection ratio of -107 dB that prevents handset battery noise from reaching audio output. User functions and configuration control are managed via built-in I²C interface, and sub-2 µA stand-by mode promotes power conservation. Output is stable under all load conditions, allowing glitch-free operation whether user is listening via headset or external hi-fi via phone output.

Original Press Release:

Flip-Chip Stereo Headset Amplifier from STMicroelectronics Brings Premium Handhelds Closer to Audio Nirvana

Low power, low distortion, and enhanced user controls enable virtuoso performance for music on the go

Geneva, February 12, 2008 - STMicroelectronics (NYSE: STM), a leader in delivering high-performance, low-power multimedia solutions for next-generation mobile products, has announced the TS4601, a stereo headset amplifier optimized for feature-phone applications that improves audio performance, extends battery life and enables more responsive user controls compared to existing solutions.

The TS4601's class-leading power-supply rejection ratio of -107dB (typical) 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 2.1x2.1x0.6mm allows designers to take advantage of the TS4601's enhanced features to create sleek, high-end mobile handsets offering advanced music features. The TS4601 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, enabling enhanced flexibility and an improved user experience compared to other devices on the market.

Ease of use and versatility are further enhanced since 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.

The TS4601 is available from February 2008, at $1.30 in quantities of 1000 upwards.

About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence markets. The Company's shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2007, the Company's net revenues were $10 billion. Further information on ST can be found at

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