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LM49100 Datasheet

  • LM49100

  • Mono Class AB Audio Subsystem with a True-Ground Headphone A...

  • 2075.50KB

  • 24頁

  • NSC

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LM49100 Mono Class AB Audio Subsystem with a True-Ground Headphone Amplifier
June 2007
LM49100
Mono Class AB Audio Subsystem with a True-Ground
Headphone Amplifier
General Description
The LM49100 is a fully integrated audio subsystem capable
of delivering 1.275W of continuous average power into a
mono 8鈩?bridged-tied load (BTL) with 1% THD+N and with a
5V power supply. The LM49100 also has a stereo true-ground
headphone amplifier capable of 50mW per channel of con-
tinuous average power into a 32鈩?single-ended (SE) loads
with 1% THD+N.
The LM49100 has three input channels. One pair of SE inputs
can be used with a stereo signal. The other input channel is
fully differential and may be used with a mono input signal.
The LM49100 features a 32-step digital volume control and
ten distinct output modes. The mixer, volume control, and de-
vice mode select are controlled through an I
2
C compatible
interface.
Thermal overload protection prevent the device from being
damaged during fault conditions. Superior click and pop sup-
pression eliminates audible transients on power-up/down and
during shutdown.
Key Specifications
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Power Output at V
DD
= 5V:
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Speaker:
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R
L
= 8鈩?
THD+N
鈮?/div>
1%
鈥傗€?/div>
Headphone (V
DD
HP = 2.8V):
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R
L
= 32鈩?
THD+N
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1%
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Shutdown current
1.275W
50mW
0.01碌A(chǔ)
Features
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Mono and stereo inputs
Thermal Overload Protection
True-ground Headphone Drivers
I
2
C Control Interface
Input mute attenuation
2nd Stage headphone attenuator
32-step digital volume control
10 Operating Modes
Minimum external components
Click and Pop suppression
Micro-power shutdown
Available in space-saving 3mm x 3mm 25 bump GR
package
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RF Suppression
Applications
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Mobile Phones
PDAs
Laptops
Portable Electronics
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
300015
www.national.com

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