Maxim has introduced a highly efficient, filterless Class-D audio amplifier device. The new MAX9712 offers Class-AB circuit simplicity (no output filters) and Class-AB audio performance (0,06% THD+N), combined with 90% Class-D efficiency, claims the company. It uses a patented modulation scheme that meets FCC radiated emissions standards without needing an output filter or ferrite beads. This results in a low-cost, ultra-compact, efficient audio amplifier requiring very few external components. The MAX9712 operates over 2,4 to 5,5 V, has a fixed gain of 12 dB, and produces up to 500 mW per channel into an 8 Ω load. High 70 dB PSRR at 217 Hz allows operation directly from a single lithium-ion cell without any supply conditioning. It also includes four clocking options to optimise 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.
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