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LM4881 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4881 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page LM4881 Dual 200 mW Headphone Amplifier with Shutdown Mode General Description The LM4881 is a dual audio power amplifier capable of deliv- ering 200 mW of continuous average power into an 8 Ω load with 0.1% (THD) 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 using surface mount packaging. Since the LM4881 does not require bootstrap capacitors or snub- ber networks, it is optimally suited for low-power portable systems. The LM4881 features an externally controlled, low power consumption shutdown mode which is virtually clickless and popless, as well as an internal thermal shutdown protection mechanism. The unity-gain stable LM4881 can be configured by external gain-setting resistors. Key Specifications n THD at 1 kHz at 125 mW continuous average output power into 8 Ω 0.1% (max) n THD at 1 kHz at 75 mW continuous average output power into 32 Ω 0.02% (typ) n Output power at 10% THD+N at 1 kHz into 8 Ω 300 mW (typ) n Shutdown Current 0.7 µA (typ) Features n MSOP surface mount packaging n Unity-gain stable n External gain configuration capability n Thermal shutdown protection circuitry n No bootstrap capacitors, or snubber circuits are necessary Applications n Headphone Amplifier n Personal Computers n Microphone Preamplifier Typical Application Connection Diagrams Boomer® is a registered trademark of National Semiconductor Corporation. DS100005-1 *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 MSOP Package DS100005-2 SOP and DIP Package DS100005-38 Top View Order Number LM4881MM, LM4881M, or LM4881N See NS Package Number MUA08A, M08A, or N08E September 1997 © 1999 National Semiconductor Corporation DS100005 www.national.com |
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