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LM4949_07 Datasheet

  • LM4949_07

  • National Semiconductor [Stereo Class D Audio Subsystem with...

  • 973.64KB

  • NSC

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LM4949 Stereo Class D Audio Subsystem with OCL Headphone Amplifier
January 2007
LM4949
鈥?/div>
Stereo Class D Audio Subsystem with OCL Headphone
Amplifier
General Description
The LM4949 is a fully integrated audio subsystem designed
for stereo cell phone applications. The LM4949 combines a
2.5W stereo Class D amplifier plus a separate 190mW stereo
headphone amplifier, volume control, and input mixer into a
single device. The filterless class D amplifiers deliver 1.19W/
channel into an 8鈩?load with <1% THD+N from a 5V supply.
The headphone amplifier features National鈥檚 Output Capaci-
tor-less (OCL) architecture that eliminates the output coupling
capacitors required by traditional headphone amplifiers. Ad-
ditionally, the headphone amplifiers can be configured with
capacitively coupled (CC)loads, or used to drive an external
headphone amplifier. When configured for an external ampli-
fier, the V
DD
/2 output (VOC) controls the external amplifier鈥檚
shutdown input.
For improved noise immunity, the LM4949 features fully dif-
ferential left, right and mono inputs. The three inputs can be
mixed/multiplexed to either the speaker or headphone ampli-
fiers. The left and right inputs can be used as separate single-
ended inputs, mixing multiple stereo audio sources. The
mixer, volume control, and device mode select are controlled
through an I
2
C compatible interface.
Output short circuit and thermal shutdown protection prevent
the device from being damaged during fault conditions. Su-
perior click and pop suppression eliminates audible transients
on power-up/down and during shutdown.
Key Specifications
鈻犫€?/div>
Efficiency V
DD
= 3.6V, 400mW
鈥?/div>
into 8鈩?/div>
鈻犫€?/div>
Efficiency V
DD
= 5V, 1W into 8鈩?/div>
鈻犫€?/div>
Quiescent Power Supply Current
鈥?/div>
@ 3.6V
鈻犫€?/div>
Power Output at V
DD
= 5V
Speaker:
R
L
= 4鈩?
THD+N
鈮?/div>
1%
R
L
= 8鈩?
THD+N
鈮?/div>
1%
R
L
= 4鈩?
THD+N
鈮?/div>
10%
Headphone:
R
L
= 16鈩?
THD+N
鈮?/div>
1%
R
L
= 32鈩?
THD+N
鈮?/div>
1%
2W
1.19W
2.5W
153mW
89mW
0.1渭A
86.5%
87.4%
9.36mA
鈻犫€?/div>
Shutdown Current
Features
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Output Short Circuit Protection
Thermal Shutdown
Stereo filterless Class D operation
Selectable OCL/CC Headphone Drivers
RF Suppression
I
2
C Control Interface
32-step digital volume control
Independent Speaker and Headphone Gain Settings
Minimum external components
Click and Pop suppression
Micro-power shutdown
Available in space-saving 25 bump 碌SMD package
Applications
鈻?/div>
Mobile phones
鈻?/div>
PDAs
鈻?/div>
Laptops
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
202001
www.national.com

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