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Audio amp integrates automatic level control

Sunnyvale, Calif. — Maxim Integrated Products Inc. rolled out an integrated 2-W class AB audio amplifier for notebook PCs, small flat-panel displays, and portable DVD/media players, that is said to boost output power while minimizing distortion.

The MAX9756 features Maxim's automatic level control, which increases average output power while reducing distortion and protecting the loud speakers, the company said. It combines a 150-mA low dropout regulator (LDO) and Maxim's DirectDrive headphone amplifier technology.

The amplifier's 150-mA LDO provides a clean power source for external components such as a digital-to-analog (D/A) converter or codec, according to Maxim. A dc volume-control input provides full gain control. The DirectDrive technology produces a ground-referenced output from a single supply, eliminating the two bulky dc-blocking capacitors typically required between the amplifier and headphone. In addition, click-and-pop suppression is said to eliminate audible transients on power and shutdown cycles.

The amplifier operates from a single 4.5-V to 5.5-V supply, produces up to 2 W per channel, and features 90 dB power supply rejection ratio (PSRR) and 0.02 percent total harmonic distortion plus noise (THD+N).

The MAX9756 is available in a small, 36-pin TQFN (6 x 6mm) package and includes complete short-circuit and thermal-overload protection. Specifications are guaranteed over the extended -40°C to +85°C temperature range.

Pricing for the MAX9756ETX start at $1.10 (100,000-up, FOB USA). Click here for the MAX9756ETX data sheet.

Maxim , 1-800-998-8800, www.Maxim-ic.com.

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