Vista-Compliant Audio Subsystems Save Space And Power In Notebooks December 04, 2008
Maxim Integrated Products introduced what it claims is the industry's first Windows Vista-compliant, audio-subsystem ICs for notebook computers. The MAX9791/MAX9792 devices combine a stereo 2-W (or mono 3-W) Class D speaker amplifier, a stereo DirectDrive headphone amplifier, and a 120-mA low-dropout (LDO) regulator in a 4-mm x 4-mm chip. Consequently, the audio subsystems consume 36% less board space and 37% less power than other solutions. The audio ICs are ideal for notebook PCs, docking stations, and other space-constrained applications. The headphone amplifiers employ Maxim's patented DirectDrive technology, which produces a ground-referenced output from a single supply. This technology eliminates the need for bulky and expensive DC-blocking capacitors, while improving bass response and minimizing audio distortion. The integrated 120-mA LDO can be used to power the analog portion of a PC's audio codec, thereby improving system PSRR and reducing unwanted noises, buzzes, and clicks. The MAX9791 features a stereo 2-W speaker amplifier, and the MAX9792 has a mono 3-W speaker amplifier. Both devices are fully specified over the -40ºC to +85ºC temperature range, and are available in a 28-pin TQFN package. Prices start at $0.98 in 1000-unit lots. MAXIM INTEGRATED PRODUCTS, Sunnyvale, CA. 800-998-8800.
