Part # LM4809 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM4809 Boomer ® Audio Power Amplifier Series Dual 105mW Headphone Amplifier with Active-Low Shutdown Mode

Part Details:

LM4809 April 2004 Dual LM4809Dual 105mW Headphone Amplifier with Active-Low 105mW Shutdown ModeGeneral Description Key Specifications The LM4809 is a dual audio power amplifier capable of n THD+N at 1kHz at 105mW continuous average power Headphone delivering 105mW per channel of continuous average power into 16 0.1% (typ) into a 16 load with 0.1% (THD+N) from a 5V power supply. n THD+N at 1kHz at 70mW continuous average power Boomer audio power amplifiers were designed specifically to into 32 0.1% (typ) provide high quality output power with a minimal amount of n Shutdown Current 0.4µA (typ) external components. Since the LM4809 does not requirebootstrap capacitors or snubber networks, it is optimally Features suited for low-power portable systems. n Active-low shutdown mode The unity-gain stable LM4809 can be configured by external n "Click and Pop" reduction circuitry Amplifier gain-setting resistors. n Low shutdown current The LM4809 features an externally controlled, active-low, n LLP, MSOP, and SO surface mount packaging micropower consumption shutdown mode, as well as an n No bootstrap capacitors required internal thermal shutdown protection mechanism. n Unity-gain stable Applications with n Headphone Amplifier n Personal Computers n Microphone Preamplifier Active-Low n PDA s Typical Application Shutdown Mode 20009001 *Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors. FIGURE 1. Typical Audio Amplifier Application Circuit Boomer® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS200090 Connection Diagrams

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LM4809.pdf Datasheet