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Class-D amplifier targets FPDs

Sunnyvale, Calif. — Maxim Integrated Products Inc. said this high-power device is the lowest cost filterless Class-D amplifier available for flat-panel applications.

Maxim's MAX9741 delivers continuous output power of 12 W per channel into 8-ohm loads. It features a power supply rejection ratio (PSRR) of 80 dB, low total harmonic distortion plus noise (THD+N) of 0.07 percent, and signal-to-noise ratio (SNR) in excess of 100 dB.

The Class D efficiency eliminates the need for a heat sink, while the company's proprietary spread-spectrum modulation (SSM) technology reduces the external filtering required to pass FCC EMI limits, the company said. SSM saves up to 15 cents per channel (based on consumer electronics volumes) on filtering compared to competitors' Class D amplifiers, according to Maxim.

The MAX9741 also does not require Schottky diodes or large, electrolytic capacitors.

The device offers differential inputs, internal circuitry for comprehensive click-and-pop suppression, and four selectable gain settings.

Packaged in a 56-pin TQFN, the amplifier also includes short-circuit and thermal-overload protection.

The device operates over the extended temperature range (-40°C to +85°C).

Pricing for the MAX9741 starts at $2.70 (1,000-up, FOB USA). Click here for the MAX9741 data sheet.

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

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