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LM4982TL Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4982TL Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 21 page LM4982 Ground-Referenced, Ultra Low Noise, 80mW Stereo Headphone Amplifier with IntelliSense and I2C Volume Control General Description The LM4982 is a ground referenced, variable gain audio power amplifier capable of delivering 80mW of continuous average power into a 16 Ω single-ended load with less than 1% THD+N from a 3V power supply. The I 2C volume control allows +18 to -76 dB gain settings. The LM4982 utilizes advanced charge pump technology to generate the LM4982’s negative supply voltage. This elimi- nates the need for output-coupling capacitors typically used with single-ended loads. IntelliSense is a new circuit technology that allows the LM4982 to detect whether a mono or stereo headphone plug has been inserted into the output jack. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4982 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage appli- cations where minimal power consumption is a primary re- quirement. The LM4982 incorporates selectable low-power consump- tion shutdown and channel select modes. The LM4982 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. Key Specifications j Improved PSRR at 217Hz 66dB j Stereo Output Power at VDD = 3V, R L =32 Ω, THD+N = 1% 51mW (typ) j Shutdown current 0.1µA (typ) Features n Ground referenced outputs n I 2C Volume and mode controls n Available in space-saving micro SMD package n Ultra low current shutdown mode n Advanced pop & click circuitry eliminates noises during turn-on and turn-off transitions n 1.6 – 4.0V operation n No output coupling capacitors, snubber networks, bootstrap capacitors or gain-setting resistors required n Mono/Stereo headphone detect Applications n Notebook PCs n Desktop PCs n Mobile Phones n PDAs n Portable electronic devices n MP3 Players Boomer® is a registered trademark of National Semiconductor Corporation. February 2006 © 2006 National Semiconductor Corporation DS201614 www.national.com |
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