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Tiny Class D audio subsystem touts high output power

Posted: 21 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:Class D audio subsystem? stereo headphone amplifier? receiver?

Maxim Integrated Products has introduced the MAX9796 2.3W, Class D audio subsystem that combines a mono Class D amplifier, a DirectDrive stereo headphone amplifier and a DirectDrive mono receiver amplifier.

Using Maxim's patented, DirectDrive architecture, the receiver and headphone amplifiers produce a ground-referenced output from a single supply, eliminating the need for large, DC-blocking capacitors. To further save cost and space, the MAX9796 uses Maxim's patented, active-emissions-limiting (AEL) circuitry and spread-spectrum-modulation technique, which greatly reduce EMI and eliminate the output filters typically required by Class D amplifiers. According to Maxim, MAX9796 provides the industry's highest output power and smallest total solution, making it well suited for cellphones, PMPs, handheld gaming consoles and other applications in which high audio quality, output power and efficiency are paramount.

The MAX9796 incorporates Maxim's third-generation, ultralow EMI, Class D amplifier technologies (DirectDrive, AEL, and spread-spectrum modulation) to provide Class AB performance with Class D efficiency. This subsystem, thus, delivers 2.3W of output power into a 4 load from a 5V supply, and offers efficiencies up to 79 percent. The MAX9796 also features a fully differential architecture, a full-bridged output, and comprehensive click-and-pop suppression. Multiple audio inputs increase flexibility and reduce total solution size over competitive devices, which require external switches. To further enhance flexibility, the MAX9796 utilizes a user-defined, I?C-controlled mixer architecture that includes an input mixer, volume control and output mixer.

The MAX9796 is packaged in a 3mm x 3mm, 32-bump UCSP housing that is fully specified over the -40C to 85C extended temperature range. Prices start at $1.67 for 1,000-unit pieces.

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