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LM4949TL Datasheet

  • LM4949TL

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

  • NSC

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LM4949 Stereo Class D Audio Subsystem with OCL Headphone Amplifier
September 2006
LM4949
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 ste-
reo 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
Capacitor-less (OCL) architecture that eliminates the output
coupling capacitors required by traditional headphone ampli-
fiers. Additionally, the headphone amplifiers can be config-
ured with capacitively coupled (CC)loads, or used to drive an
external headphone amplifier. When configured for an exter-
nal amplifier, the V
DD
/2 output (VOC) controls the external
amplifier鈥檚 shutdown input.
For improved noise immunity, the LM4949 features fully
differential left, right and mono inputs. The three inputs can
be mixed/multiplexed to either the speaker or headphone
amplifiers. 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 tran-
sients on power-up/down and during shutdown.
Key Specifications
j
Efficiency V
DD
= 3.6V, 400mW into 8鈩?/div>
j
Efficiency V
DD
= 5V, 1W into 8鈩?/div>
j
Quiescent Power Supply Current
@
3.6V
j
Power Output at V
DD
= 5V
86.5%
87.4%
9.36mA
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%
j
Shutdown Current
2W
1.19W
2.5W
153mW
89mW
0.1碌A(chǔ)
Features
n
n
n
n
n
n
n
n
n
n
n
n
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
n
Mobile phones
n
PDAs
n
Laptops
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2006 National Semiconductor Corporation
DS202001
www.national.com

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