Class-D Mono AmplifierThe 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.
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