LM4982 Datasheet | National Semiconductor

Description The LM4982 is a ground referenced, variable gain audio power amplifier capable of delivering 80m W of continuous average power into a 16Ω single-ended load with less than 1% THD+N from a 3V power supply. The I2C volume control allows +18 to -76 d B gain settings. The LM4982 utilizes advanced charge pump technology to generate the LM4982’s negative supply voltage. This eliminates the need for output-coupling capacitors typically used with single-ended loads. Intelli Sense 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 ponents. The LM4982 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM4982 incorporates selectable low-power consumption 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 j Stereo Output Power at VDD = 3V, 66d B 51m W (typ) 0.1µA (typ) RL = 32Ω, THD+N = 1% j Shutdown current Features Ground referenced outputs I2C Volume and mode controls Available in space-saving micro SMD package Ultra low current shutdown mode 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 n n n n n Applications n n n n n n Notebook PCs Desktop PCs Mobile Phones PDAs Portable electronic devices MP3 Players Boomer ® is a registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor...