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LM4851ITL Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM4851ITL
Descripción Electrónicos  Integrated Audio Amplifier System
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4851ITL Datasheet(HTML) 1 Page - National Semiconductor (TI)

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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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