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Low EMI filterless audio amplifier

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MAXIM Integrated Products, represented by Arrow Electronics , has introduced the MAX9712 highly efficient, filterless Class-D audio amplifier.

The MAX9712 offers Class-AB circuit simplicity (no output filters) and Class-AB audio performance (0.06% THD+N), combined with 90% Class-D efficiency.

The device employs a patented modulation scheme that meets FCC radiated emissions standards without the need for an output filter or ferrite beads.

This results in a low-cost, ultra-compact, highly efficient audio amplifier requiring very few external components.

The MAX9712 operates over a 2.4V to 5.5V supply, has a fixed gain of 12dB, and produces up to 500mW per channel into an 8 ohm load.

High 70dB PSRR at 217Hz allows operation directly from a single lithium-ion cell without the need for additional supply conditioning.

The MAX9712 includes four clocking options to optimize the noise spectrum for a given application.

These include three internally generated clock rates and a fourth unique external-clock mode, allowing the user to control the exact placement of the switching energy.

In addition, multiple MAX9712's can operate in a master/slave configuration, making it possible to easily configure two amplifiers for stereo operation while eliminating clock noise interaction.

Comprehensive click-and-pop reduction circuitry ensures fast turn-on/turn-off times without audible glitches.

The MAX9712 is available in tiny 12-pin UCSP (1.5mm x 2mm x 0.6mm), 10-pin DFN (3mm x 3mm x 0.8mm), and 10-pin microMAX (3mm x 5mm x 1mm) packages.

The device is specified to operate over the -40ºC to +85ºC temperature range.

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