Class D amp cuts audio component count

20W stereo Class D speaker amplifier is ideal for portable audio systems, MP3 docking stations, gaming consoles and flat-panel televisions.

Avnet Memec is now offering the new MAX9744 from Maxim Integrated Products.

This industry's first 20W stereo Class D speaker amplifier operates from a 4.5 to 14V power supply.

The wide supply range minimises the cost of portable designs by reducing component count and allowing the use of a smaller battery pack.

The MAX9744 provides ample output power throughout the power-supply voltage range, making it ideal for portable audio systems, MP3 docking stations, gaming consoles and flat-panel televisions.

Additionally, the MAX9744 integrates 64-step analogue and digital volume control.

To ramp up or down the volume digitally, the system microcontroller can program a 6bit register through the MAX9744's I2C bus interface.

Class D amplifiers are known for high power efficiency, and the MAX9744 does not disappoint with its 93% efficiency while delivering 20W into an 8ohm load.

Achieving high 75dB PSRR, low 0.04% THD+N, and greater than 90dB SNR, this stereo amplifier offers Class AB performance with Class D efficiency.

The MAX9744 includes a low-power shutdown mode, a mute function and integrated click-and-pop suppression.

Available in a 7 x 7 x 0.8mm, 44-pin TQFN package, the device is fully specified over the -40 to +85C extended temperature range.

An evaluation kit which is also available at Avnet Memec speeds design implementation.

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