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LM4982TL Datasheet

  • LM4982TL

  • National Semiconductor [Ground-Referenced, Ultra Low Noise,...

  • NSC

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LM4982 Ground-Referenced, Ultra Low Noise, 80mW Stereo Headphone Amplifier with
IntelliSense and I2C Volume Control
February 2006
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鈩?single-ended load with less than
1% THD+N from a 3V power supply. The I
2
C volume control
allows +18 to -76 dB gain settings.
The LM4982 utilizes advanced charge pump technology to
generate the LM4982鈥檚 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
j
Stereo Output Power at V
DD
= 3V,
66dB
51mW (typ)
0.1碌A(chǔ) (typ)
R
L
= 32鈩? THD+N = 1%
j
Shutdown current
Features
Ground referenced outputs
I
2
C Volume and mode controls
Available in space-saving micro SMD package
Ultra low current shutdown mode
Advanced pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n
1.6 鈥?4.0V operation
n
No output coupling capacitors, snubber networks,
bootstrap capacitors or gain-setting resistors required
n
Mono/Stereo headphone detect
n
n
n
n
n
Applications
n
n
n
n
n
n
Notebook PCs
Desktop PCs
Mobile Phones
PDAs
Portable electronic devices
MP3 Players
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2006 National Semiconductor Corporation
DS201614
www.national.com

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