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LM4911LD Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4911LD Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 22 page  LM4911 Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL Output General Description The LM4911 is an stereo audio power amplifier capable of delivering 40mW per channel of continuous average power into a 16 Ω load or 25mW per channel into a 32Ω load at 1% THD+N from a 3V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4911 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. In addition, the LM4911 may be configured for either single-ended capaci- tively coupled outputs or for OCL outputs (patent pending). The LM4911 features a low-power consumption shutdown mode and a power mute mode that allows for faster turn on time with less than 1mV voltage change at outputs on re- lease. Additionally, the LM4911 features an internal thermal shutdown protection mechanism. The LM4911 is unity gain stable and may be configured with external gain-setting resistors. Key Specifications n PSRR at 217Hz and 1kHz 65dB (typ) n Output Power at 1kHz with V DD = 2.4V, 1% THD+N into a16 Ω load 25mW (typ) n Output Power at 1kHz with V DD = 3V, 1% THD+N into a 16 Ω load 40mW (typ) n Shutdown Current 2.0µA (max) n Output Voltage change on release from Shutdown V DD = 2.4V, RL =16 Ω (C-Coupled) 1mV (max) n Mute Current 100µA (max) Features n OCL or capacitively coupled outputs (patent pending) n External gain-setting capability n Available in space-saving MSOP and LD packages n Ultra low current shutdown mode n Mute mode allows fast turn-on (1ms) with less than 1mV change on outputs n 2V - 5.5V operation n Ultra low noise Applications n Portable CD players n PDAs n Portable electronics devices Block Diagram Boomer® is a registered trademark of National Semiconductor Corporation. 20031478 FIGURE 1. Block Diagram February 2003 © 2003 National Semiconductor Corporation DS200314 www.national.com |
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