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LM4809 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4809 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page LM4809 Dual 105mW Headphone Amplifier with Active-Low Shutdown Mode General Description The LM4809 is a dual audio power amplifier capable of delivering 105mW per channel of continuous average power into a 16 Ω load with 0.1% (THD+N) from a 5V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4809 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The unity-gain stable LM4809 can be configured by external gain-setting resistors. The LM4809 features an externally controlled, active-low, micropower consumption shutdown mode, as well as an internal thermal shutdown protection mechanism. Key Specifications n THD+N at 1kHz at 105mW continuous average power into 16 Ω 0.1% (typ) n THD+N at 1kHz at 70mW continuous average power into 32 Ω 0.1% (typ) n Shutdown Current 0.4µA (typ) Features n Active-low shutdown mode n "Click and Pop" reduction circuitry n Low shutdown current n LLP, MSOP, and SO surface mount packaging n No bootstrap capacitors required n Unity-gain stable Applications n Headphone Amplifier n Personal Computers n Microphone Preamplifier n PDA’s Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 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 November 2002 © 2002 National Semiconductor Corporation DS200090 www.national.com |
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