Part # LM4938 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM4938 Boomer ® Audio Power Amplifier Series Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain


Part Details:

LM4938 July 2005 Stereo LM4938Stereo 2W Audio Power Amplifierswith DC Volume Control and Selectable Gain 2W General Description Key Specifications Audio The LM4938 is a monolithic integrated circuit that provides n P at 1% THD+N O DC volume control, and stereo bridged audio power amplifi- n into 3 2.2W (typ) ers capable of producing 2W into 4 (Note 1) with less than n into 4 2.0W (typ) 1.0% THD or 2.2W into 3 (Note 2) with less than 1.0% n into 8 1.3W (typ) Power THD. n Single-ended mode - THD+N at 92mW into Boomer® audio integrated circuits were designed specifically 32 1.0%(typ) to provide high quality audio while requiring a minimum n Shutdown current 0.5µA (typ) amount of external components. The LM4938 incorporates aDC volume control, stereo bridged audio power amplifiers Features Amplifiers and a selectable gain or bass boost, making it optimallysuited for multimedia monitors, portable radios, desktop, and n Improved click and pop circuitry virtually eliminates portable computer applications. noise during turn on/off transitions The LM4938 features an externally controlled, low-power n DC Volume Control Interface consumption shutdown mode, and both a power amplifier n System Beep Detect and headphone mute for maximum system flexibility and n Stereo switchable bridged/single-ended power amplifiers performance. n Selectable internal/external gain and bass boost with Note 1: When properly mounted to the circuit board, LM4938MH will deliver n Thermal shutdown protection circuitry 2W into 4. See Application Information section Exposed-DAP package n Unity gain stable PCB Mounting Considerations for more information. Note 2: An LM4938MH that has been properly mounted to the circuit board


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LM4938.pdf Datasheet