LM4855

LM4855 Integrated Audio Amplifier System November 2002 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 8Ω bridged-tied load (BTL) with 1% THD+N and 115mW (typ) per channel of continuous average power into stereo 32Ω BTL loads with 0.5% THD+N, using a 5V power supply. The LM4855 features a 32 step digital volume control eight distinct output modes. The digital volume control output modes are programmed through a three-wire serial control interface, that allows flexibility in routing mixing audio channels. and and SPI and Key Specifications n THD+N at 1kHz, 1.1W into 8Ω BTL n THD+N at 1kHz, 115mW into 32Ω BTL n Single Supply Operation 1.0% (typ) 0.5% (typ) 2.6 to 5.0V Features n n n n n n n n 1.1W (typ) output power with 8Ω mono BTL load 115mW (typ) output power with stereo 32Ω BTL loads SPI programmable 32 step digital volume control Eight distinct output modes micro-SMD and LLP surface mount packaging "Click and Pop" suppression circuitry Thermal shutdown protection Low shutdown current (0.1uA, typ) 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...