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LM4982TL Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM4982TL
Descripción Electrónicos  Ground-Referenced, Ultra Low Noise, 80mW Stereo Headphone Amplifier with IntelliSense and I2C Volume
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4982TL Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM4982
Ground-Referenced, Ultra Low Noise, 80mW Stereo
Headphone Amplifier with IntelliSense and I2C Volume
Control
General Description
The LM4982 is a ground referenced, variable gain audio
power amplifier capable of delivering 80mW of continuous
average power into a 16
Ω single-ended load with less than
1% THD+N from a 3V power supply. The I
2C volume control
allows +18 to -76 dB gain settings.
The LM4982 utilizes advanced charge pump technology to
generate the LM4982’s negative supply voltage. This elimi-
nates the need for output-coupling capacitors typically used
with single-ended loads.
IntelliSense is a new circuit technology that allows the
LM4982 to detect whether a mono or stereo headphone plug
has been inserted into the output jack.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4982 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4982 incorporates selectable low-power consump-
tion shutdown and channel select modes.
The LM4982 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
Key Specifications
j Improved PSRR at 217Hz
66dB
j Stereo Output Power at VDD = 3V,
R
L =32
Ω, THD+N = 1%
51mW (typ)
j Shutdown current
0.1µA (typ)
Features
n
Ground referenced outputs
n
I
2C Volume and mode controls
n
Available in space-saving micro SMD package
n
Ultra low current shutdown mode
n
Advanced pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n
1.6 – 4.0V operation
n
No output coupling capacitors, snubber networks,
bootstrap capacitors or gain-setting resistors required
n
Mono/Stereo headphone detect
Applications
n
Notebook PCs
n
Desktop PCs
n
Mobile Phones
n
PDAs
n
Portable electronic devices
n
MP3 Players
Boomer® is a registered trademark of National Semiconductor Corporation.
February 2006
© 2006 National Semiconductor Corporation
DS201614
www.national.com


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