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Maxim Integrated Products has introduced the MAX9791/MAX9792, the industry's first Windows Vista-compliant, audio-subsystem ICs for notebook computers.
The devices combine a stereo 2W (or mono 3W) Class D speaker amplifier, a stereo DirectDrive headphone amplifier, and a 120mA low-dropout (LDO) regulator in a single 4mm x 4mm chip. Consequently, the MAX9791/MAX9792 consume 36 percent less board space and 37 percent less power than competitive solutions, while enabling a richer audio experience. These audio-subsystem ICs are ideal for notebook PCs, docking stations, and other space-constrained applications.
Combining low power consumption with an efficient Class D speaker amplifier, the MAX9791/MAX9792 maximize battery life in all operating modes. Additionally, the high efficiencies delivered by the devices eases the PCB thermal-design constraints that would be encountered utilizing Class AB amplifiers in confined spaces, such as notebook PCs. The ICs' low-EMI design reduces interference with the many radios found in today's notebooks, while their low RF susceptibility ensures robust operation in close proximity to wireless applications.
The headphone amplifiers employ Maxim's patented DirectDrive technology, which produces a ground-referenced output from a single supply. The technology eliminates the need for bulky and expensive DC-blocking capacitors, while improving bass response and minimizing audio distortion. To further improve headphone performance, the MAX9791/MAX9792 incorporate ground-sense circuitry at the headphone jack. The feature enhances crosstalk performance and rejects ground-loop-induced noise at the output jack.
The integrated 120mA LDO can be used to power the analog portion of the PC's audio codec, thereby improving system PSRR and reducing unwanted noises, buzzes, and clicks.
Availability and Pricing
The MAX9791 features a stereo 2W speaker amplifier, and the MAX9792 has a mono 3W speaker amplifier. Both devices are fully specified over the -40 to +85 degrees C extended temperature range, and are available in a space-saving, 4mm x 4mm, 28-pin TQFN package. Prices start at $0.98 (1000-up, FOB USA).
Datasheet of MAX9791, MAX9792
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