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Audio sub-system delivers 725mW output power

Posted: 14 Aug 2008     Print Version  Bookmark and Share

Keywords:audio sub-system  mono Class D  stereo headphone amplifier  analogue switch 


Maxim Integrated Products Inc. announces the availability of the industry's smallest audio sub-system. The MAX9877 combines a high-efficiency, high-power, mono Class D speaker amplifier; a DirectDrive, stereo headphone amplifier; and a low-noise, bypass analogue switch. The MAX9877 also employs Maxim's third-generation, ultra low EMI, Class D amplifier technology to provide Class AB audio performance with Class D efficiency. The device delivers 725mW of output power from a 3.7V supply into an 8Ω load with 85 per cent (max) efficiency. Providing the industry's highest output power from a lithium-ion battery, the MAX9877 is ideal for cell phones, portable media players and other applications that require high audio quality, output power and efficiency.

Maxim's patented, DirectDrive architecture produces a ground-referenced output from a single supply, thus eliminating the need for large DC-blocking capacitors. To further save cost and space, the MAX9877 utilises Maxim's active-emissions limiting and patented spread-spectrum modulation, which significantly reduce EMI and eliminate the output filters typically required by Class D amplifiers. Additionally, the integrated, low-noise, analogue DPST switch allows the Class D amplifier to be bypassed to reduce power consumption in portable devices, eliminating the need for an external switch. The MAX9877 also features input mixing, volume control, comprehensive click-and-pop suppression, and a flexible, user-defined input architecture with three preamplifier gain settings. All controls are enabled through an I2C interface.

The MAX9877 is packaged in a 2.5mm x 2mm, 20-bump WLP that is fully specified over the -40°C to +85°C extended temperature range.

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