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National Semiconductor Electronic Components Datasheet

LM49100 Datasheet

Mono Class AB Audio Subsystem

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LM49100 pdf
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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 8bridged-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 32single-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 I2C 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
■ Power Output at VDD = 5V:
  Speaker:
  RL = 8Ω, THD+N 1%
  Headphone (VDDHP = 2.8V):
  RL = 32Ω, THD+N 1%
■ Shutdown current
1.275W
50mW
0.01µA
Features
Mono and stereo inputs
Thermal Overload Protection
True-ground Headphone Drivers
I2C 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
RF Suppression
Applications
Mobile Phones
PDAs
Laptops
Portable Electronics
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 300015
www.national.com


National Semiconductor Electronic Components Datasheet

LM49100 Datasheet

Mono Class AB Audio Subsystem

No Preview Available !

LM49100 pdf
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Typical Application
FIGURE 1. Typical Audio Amplifier Application Circuit
300015o4
www.national.com
2


Part Number LM49100
Description Mono Class AB Audio Subsystem
Maker National Semiconductor
Total Page 24 Pages
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