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LM4855 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4855 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 24 page  LM4855 Integrated Audio Amplifier System General Description The LM4855 is an audio power amplifier system capable of delivering 1.1W (typ) of continuous average power into a mono 8 Ω bridged-tied load (BTL) with 1% THD+N and 115mW (typ) per channel of continuous average power into stereo 32 Ω BTL loads with 0.5% THD+N, using a 5V power supply. The LM4855 features a 32 step digital volume control and eight distinct output modes. The digital volume control and output modes are programmed through a three-wire SPI serial control interface, that allows flexibility in routing and mixing audio channels. The LM4855 is designed for cellular phone, PDA, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only six external components. The industry leading micro SMD package only utilizes 2mm x 2.3mm of PCB space, making the LM4855 the most space efficient audio sub system available today. Key Specifications n THD+N at 1kHz, 1.1W into 8 Ω BTL 1.0% (typ) n THD+N at 1kHz, 115mW into 32 Ω BTL 0.5% (typ) n Single Supply Operation 2.6 to 5.0V Features n 1.1W (typ) output power with 8 Ω mono BTL load n 115mW (typ) output power with stereo 32 Ω BTL loads n SPI programmable 32 step digital volume control n Eight distinct output modes n micro-SMD and LLP surface mount packaging n "Click and Pop" suppression circuitry n Thermal shutdown protection n Low shutdown current (0.1uA, typ) Applications n Moblie Phones n PDAs Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 200395D1 FIGURE 1. Typical Audio Amplifier Application Circuit November 2002 © 2002 National Semiconductor Corporation DS200395 www.national.com |
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