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LM4681 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4681 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 19 page  LM4681 10 Watt Stereo CLASS D Audio Power Amplifier with Stereo Headphone Amplifier and I 2C/SPI Volume Control General Description The LM4681 is a fully integrated single supply, CLASS D audio power amplifier solution. The LM4681 utilizes a pro- prietary balanced pulse-width modulation technique that low- ers output noise and THD and improves PSRR when com- pared to conventional pulse width modulators. The LM4681 also features a stereo headphone amplifier that delivers 80mW into a 32 Ω headset with less than 0.5% THD. The LM4681’s I 2C/SPI (selectable) volume control has a +30dB to –48dB range when speakers are driven and a range of +13dB to –65dB when headphones are connected. All amplifiers are protected by thermal shutdown. Addition- ally, the high efficiency power amplifiers have output current limit. With a 8 Ω load, the IC’s efficiency for a 6W power level is 85%. The IC features click and pop reduction circuitry that minimizes audible popping during device turn-on and turn- off. The LM4681 is available in a 48-lead LLP package, ideal for portable and desktop computer applications. Key Specifications n P O at THD+N =10%, AV = 30dB, VDD = 14V 10W (typ) n THD+N at 1kHz at 1W into 8 Ω (Power Amp) 0.43% (typ) n Efficiency at 7W into 8 Ω 85% (min) n Total quiescent power supply current 50mA (typ) n THD+N 1kHz, 20mW, 32 Ω (Headphone) 0.02% (typ) n Single supply range 9.0V to 15.5V Features n Pulse-width modulator. n I 2C/SPI (selectable) volume control n Stereo headphone amplifier. n “Click and pop” suppression circuitry. n Micropower shutdown mode. n 48 lead LLP package (No heatsink required). Applications n Flat Panel Displays n Televisions n Multimedia Monitors Block Diagram 20118922 Block Diagram for LM4681 BOOMER™ is a trademark of National Semiconductor Corporation. March 2006 © 2006 National Semiconductor Corporation DS201189 www.national.com |
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