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Speaker amp with 90dB PSRR

Posted: 08 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Maxim Integrated Products? MAX9787? speaker amplifier?

Maxim Integrated Products rolled out a Class AB 2.2W speaker amplifier with integrated analog volume control, a beep input, and a 90dB power-supply rejection ratio (PSRR). The analog volume control of the MAX9787 amplifier can be driven with a potentiometer, an RC-filtered PWM source or a DAC output. The beep input allows users to add alert signals from a system controller to the audio path.

The MAX9787's 90dB PSRR ensures low THD+N even when using an unregulated power supply. According to Maxim, competitive amplifiers with lower PSRR either require an expensive regulated power supply, which increases that overall solution cost, or allow power-supply noise to pass through the amplifier to the speakers, which degrades the audio quality.

Delivering audiophile audio quality with 0.01 percent THD+N, the MAX9787 is suitable for multimedia monitors, notebook computers and portable audio players. This device also offers Maxim's click-and-pop suppression, which eliminates audible transients during power and shutdown cycles. Other features include a single-supply voltage, shutdown mode, logic-selectable gain, and thermal-overload and output short-circuit protection. Four maximum gain settings range from 6dB to 10.5dB with two gain pins.

The MAX9787 is offered in a thermally efficient 28-pin thin QFN (5-by-5-by-0.8mm) package, and is specified over the extended -40C to 85C temperature range. Prices start at $1.35 (1,000-up, FOB USA).

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