LM4856LQ

Manufacturer Part NumberLM4856LQ
ManufacturerNational Semiconductor
LM4856LQ datasheets
 


Specifications of LM4856LQ

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LM4856
Integrated Audio Amplifier System
General Description
The LM4856 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
60mW (typ) per channel of continuous average power into
stereo 32Ω single-ended (SE) loads with 0.5% THD+N, us-
ing a 5V power supply.
The LM4856 features a 32 step digital volume control and
eight distinct output modes. The digital volume control and
output modes are programmed through a two-wire I
patible control interface, that allows flexibility in routing and
mixing audio channels.
The LM4856 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
eight external components.
The industry leading micro SMD package only utilizes 2mm
x 2.3mm of PCB space, making the LM4856 the most space
efficient audio sub system available today.
Typical Application
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
Key Specifications
n THD+N at 1kHz, 1.1W into 8Ω BTL
n THD+N at 1kHz, 60mW into 32Ω SE
n Single Supply Operation
Features
n 1.1W (typ) output power with 8Ω mono BTL load
n 60mW (typ) output power with stereo 32Ω SE loads
2
n I
C programmable 32 step digital volume control
2
C com-
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
DS200607
May 2004
1.0% (typ)
0.5% (typ)
2.6 to 5.0V
20060732
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