SM6800A

SM6800A Class-D Mono Amplifier for Mobile Telephones OVERVIEW The SM6800A is an analog-input, class-D mono amplifier. Class-D operation provides high efficiency 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, boosting 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-efficiency. The output stage has a BTL output configuration where the output waveform inverts only the modulation components, enabling direct drive connection, without using an LC filter, 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 amplifier circuit. FEATURES I I I I I PINOUT (Top view) PROT TEST TM2 TM1 VSS3 20 19 18 17 16 I I APPLICATIONS I I I Cellular phone PDA Digital still camera PACKAGE DIMENSIONS (Unit: mm) 4.20 ± 0.20 4.00 ± 0.10 ORDERING INFORMATION Device SM6800AB Package 4.20 ± 0.20 20-pin QFN 4.00 ± 0.10 20 1 0.50 VREF3 VREF2 VREF1 PDWN MUTEN Operating supply voltage: 2.7 to 4.3V Low current consumption: 4.8mA (VDD = 3.6V) Output power: 0.7W (VDD = 3.6V, 8Ω load) Output fundamental freque...