Class-D Mono Amplifier

The SM6800A is an analog-input, class-D mono amplier. Class-D operation provides high efciency and low power consumption. The device also incorporates a selectable real-time operation dynamic range compression function that effectively suppresses the distortion in the saturation level region output by soft-clipping, boost- ing the average sound pressure from the speaker during playback. It also incorporates an input equalizer pin for output speaker frequency characteristics adjustment. These features make the device ideal for use in mobile telephones and speaker applications requiring miniaturization and high-efciency. The output stage has a BTL output conguration where the output waveform inverts only the modulation components, enabling direct drive connection, without using an LC lter, to a dynamic speaker. The device is available in miniature 20-pin QFN packages, and requires only a peripheral chip capacitor to form a miniature amplier circuit. By Seiko NPC Corp.