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LM4851 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4851 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 22 page  LM4851 Integrated Audio Amplifier System General Description The LM4851 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 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 single- channel 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 components. 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 THD+N at 1kHz, 1.5W into 4 Ω BTL (LQ) 1% (typ) n THD+N at 1kHz, 1.1W into 8 Ω BTL 1% (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 Mono 1.1W (typ) and stereo 115mW (typ) output n SPI programmable 32 step digital volume control (-40.5dB to +6dB) 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 Boomer® is a registered trademark of National Semiconductor Corporation. 20040831 FIGURE 1. Typical Audio Amplifier Application Circuit December 2002 © 2002 National Semiconductor Corporation DS200408 www.national.com |
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