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Stereo Headphone Amplifiers Continuously Adjust the Supply Rails in Response to the Input

Mon, 08/16/2010 - 11:00am
austriamicrosystems has announced the AS3560 and AS3561 Stereo Headphone Amplifiers for mobile phones, portable navigation devices, music/media players and any media device that uses headphones. According to the company, these 30 mW headphone amplifiers continuously adjust the supply rails in response to the input signal, thus drastically minimizing power consumption as compared to traditional Class AB amplifiers. The AS3560 is a Class G amplifier while the AS3561 uses a Class H topology. Class G topology switches between three power rails, while the Class H adapts the power rail to whatever power is needed to drive the headphone volume. Both devices use differential line inputs to minimize the effects of ground noise and EMI susceptibility, and also feature low quiescent current of 1 mA with both channels enabled. The shutdown current is less than 5 µA. The audio performance is >100 dB SNR at 1 Vrms and THD of 0.02 percent at 16 OHgr>. The integrated charge pump generates a symmetric negative supply for true ground output signal levels, and an Isup>2/sup>C bus allows volume control with 32 gain steps as well as independent channel control. Austriamicrosystems 919-676-5292 www.austriamicrosystems.com
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