3W, Stereo Audio Amplifiers with Headphone Amp and Input Mux Are Optimized for Multimedia Monitors and Notebook Computers
SUNNYVALE, CA-May 11, 2006-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX9777/MAX9778, highly integrated audio amplifiers that combine a stereo 3W bridge-tied load (BTL) audio amplifier, stereo headphone amp, headphone sensing, and a 2:1 input multiplexer. The MAX9777 has an I2C* interface and the MAX9778 has a parallel-control interface. Both devices are available in a tiny, 28-pin thin (5mm x 5mm x 0.8mm) TQFN package. The MAX9777/MAX9778 are optimized for portable and low-power-output applications such as notebook computers, multimedia monitors, and DVD players.
The MAX9777/MAX9778 operate from a 4.5V to 5.5V single supply and feature an industry-leading 100dB PSRR, which allows operation from noisy supplies without adding a linear regulator. Ultra-low 0.002% THD+N ensures clean, low-distortion amplification of the audio signal. Patented click-and-pop suppression eliminates audible transients on power and shutdown cycles.
Power-saving features include a low 10mV offset voltage to minimize DC current drain through the speakers, a low 13mA supply current, and a 10 µA shutdown mode. A MUTE function allows the outputs to be quickly enabled or disabled. For design flexibility, a headphone-sense input automatically detects the presence of a headphone jack and configures the amplifiers for either speaker or headphone mode. To compensate for limitations in the frequency response of the loudspeakers, the integrated 2:1 input multiplexer makes it easy to select from multiple audio sources or an external equalizer network. The various functions are controlled by either the I2C-compatible or simple parallel-control interface.
The MAX9777/MAX9778 are available in a thermally efficient, 28-pin QFN package. Both devices have complete thermal overload protection, and are specified over the extended -40°C to +85°C temperature range. Prices start at $1.25 (1,000-up, FOB USA).
*Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associate Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification defined by Philips.
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