STMicroelectronics Releases Flip-Chip Stereo Headset Amplifier for Phones, Notebook Computers
February 22, 2008 // Published as a news service by IHS
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STMicroelectronics (ST) announced the TS4601, a stereo headset amplifier for feature-phone applications that the company said improves audio performance, extends battery life and enables more responsive user controls.
The TS4601 can also be used in other portable and consumer products, including MP3 players and notebook computers.
The TS4601's power-supply rejection ratio of -107 dB (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, ST said.
The sub 2 microamp stand-by mode adds to power management.
The low-profile flip-chip package measures 2.1 millimeters by 2.1 millimeters by 0.6 millimeter. User functions and configuration control are managed via a built-in inter-integrated circuit (I2C) interface.
According to ST, TS4601 output is stable under all load conditions, which allows glitch-free operation whether the user is listening via the headset or to an external hi-fi, via the phone output.
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.
Source: STMicroelectronics (ST).