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Integrated audio amplifier

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article image MAX9770 integrated audio amplifier.

MAXIM Integrated Products has released the MAX9770, an integrated audio amplifier optimised for applications including PDAs, digital cameras, and mobile phones. It is available from Arrow Electronics .

It combines the benefits of Maxim's low EMI, filterless, Class D amplifier technology with a DirectDrive headphone amplifier. This results in a low cost, low component count audio amplifier solution.

The 1.2W, low-EMI, filterless, mono Class D amp offers the audio quality typically associated with linear amps (Class AB) and the benefits of high efficiency (80%) Class D operation. The spread-spectrum modulation scheme reduces EMI emissions up to 6dB more than competing Class D solutions. This allows it to meet FCC EMI levels without additional filtering. Single 2.5V to 5.5V operation with high 85dB PSRR allows the device to operate directly from a lithium-ion (Li+) battery, saving the cost of additional regulation.

The low 0.02% THD+N ensures high quality audio playback. The 80mW DirectDrive headphone amplifier produces a ground referenced output from a single supply. This eliminates the two bulky dc-blocking capacitors typically required between the amplifier and headphone. Click-and-pop suppression eliminates audible transients on power and shutdown cycles.

The MAX9770 includes selectable gain levels and a three way input mixer. It is available in small 28 pin TQFN or TSSOP packages. It includes short-circuit and thermal overload protection and operates over the extended temperature range from -40°C to 85°C.

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