LM4851 Datasheet | National Semiconductor

Description The LM4851 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 115m W (typ) per channel of continuous average power into stereo 32Ω BTL loads with 0.5% THD+N, using a 5V power supply. The LM4851 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 LM4851 has 3 inputs: one pair for a two-channel stereo signal and the third for a singlechannel mono input. The LM4851 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 five external ponents. The industry leading micro SMD package utilizes only 2mm x 2.3mm of PCB space, making the LM4851 the most space efficient audio sub system available today. Key Specifications n n n n THD+N at 1k Hz, 1.5W into 4Ω BTL (LQ) THD+N at 1k Hz, 1.1W into 8Ω BTL THD+N at 1k Hz, 115m W into 32Ω BTL Single Supply Operation 1% (typ) 1% (typ) 0.5% (typ) 2.6 to 5.0V Features n Mono 1.1W (typ) and stereo 115m W (typ) output n SPI programmable 32 step digital volume control (-40.5d B to +6d B) n Eight distinct SPI programmable output modes n micro-SMD and LLP surface mount packaging n “Click and pop” suppression circuitry n Thermal shutdown protection n Low shutdown current (0.1µA, typ) Applications n Mobile phones n PDAs Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® is a registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation DS200408 .national. Connection Diagrams 18-Bump micro SMD Marking (IBL) 18-Bump micro SMD Marking (ITL) 200408A5 200408B3 Top View XY- Date Code TT - Die Traceability G - Boomer Family 52 - LM4851IBL-1 Top...