Industry's Smallest Audio Subsystem Provides Highest Output Power from a Lithium-Ion Battery
Note to Editor:
- The MAX9877 is an audio subsystem that integrates a 2.7W, Class D speaker amplifier; a DirectDrive, stereo headphone amplifier; and a bypass analog switch.
- This device uses proprietary, Class D amplifier technology to provide the industry's highest output power (725mW from 3.7V into 8Ω) from a lithium-ion battery.
- Additionally, its DirectDrive architecture eliminates multiple external components, thus providing the industry's smallest total solution size.
- The MAX9877 is ideal for cell phones, portable media players, and other applications that require high audio quality, output power, and efficiency.
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SUNNYVALE, CA—August 6, 2008—Maxim Integrated Products (PINK OTC MARKETS: MXIM) introduces the MAX9877, the industry's smallest audio subsystem. This device combines a high-efficiency, high-power, mono Class D speaker amplifier; a DirectDrive®, stereo headphone amplifier; and a low-noise, bypass analog switch. In addition to this integration, the MAX9877 employs Maxim's third-generation, ultra-low-EMI, Class D amplifier technology to provide Class AB audio performance with Class D efficiency. It thus delivers 725mW of output power from a 3.7V supply into an 8Ω load with 85% (max) efficiency. Providing the industry's highest output power from a lithium-ion battery, the MAX9877 is ideal for cellular phones, portable media players (PMPs), 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 utilizes 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, analog 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. Prices start at $1.62 (1000-up, FOB USA). An evaluation kit is available to speed designs.
Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells over $2 billion of high-performance semiconductor products annually. It was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, Maxim has developed over 5700 products serving the industrial, communications, consumer, and computing markets. For more information, go to www.maxim-ic.com.
*U.S. Patent #7,061,327
**Patent pending
†U.S. Patent #6,847,257
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