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LM49120TLX Datasheet

  • LM49120TLX

  • Audio Sub-System with Mono Class AB Loudspeaker Amplifier an...

  • 720.30KB

  • 28頁

  • NSC

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LM49120 Audio Sub-System with Mono Class AB Loudspeaker Amplifier and Stereo OCL/SE
Headphone Amplifier
July 15, 2008
LM49120
Audio Sub-System with Mono Class AB Loudspeaker
Amplifier and Stereo OCL/SE Headphone Amplifier
General Description
The LM49120 is a compact audio subsystem designed for
portable handheld applications such as cellular phones. The
LM49120 combines a mono 1.3W speaker amplifier, stereo
85mW/ch output capacitorless headphone amplifier, 32 step
volume control, and an input mixer/multiplexer into a single
16鈥揵ump micro SMD package.
The LM49120 has three input channels: two single-ended
stereo inputs and a differential mono input. Each input fea-
tures a 32-step digital volume control. The headphone output
stage features an 8 step (-18dB 鈥?0dB) attenuator, while the
speaker output stage has two selectable (0dB/+6dB) gain
settings. The digital volume control and mode control are pro-
grammed through a two-wire I
2
C compatible interface.
鈥?/div>
Speaker:
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R
L
= 8鈩?
BTL, THD+N
鈮?/div>
1%
鈥?/div>
Headphone:
鈥傗€?/div>
R
L
= 32鈩?
OCL/SE, THD+N
鈮?/div>
1%
540mW (typ)
35mW (typ)
Features
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
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鈻?/div>
鈻?/div>
鈻?/div>
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RF immunity
Selectable OCL/SE headphone drivers
32 Step volume control
Click and Pop suppression
Independent speaker and headphone gain settings
Minimum external components
Thermal over load protection
Micro-power shutdown
Space saving 16鈥揵ump mciro SMD package
Thermal shutdown protection
Micro-power shutdown
I
2
C Control Interface
Key Specifications
鈻犫€?/div>
Output power at V
DD
= 5V:
鈥?/div>
Speaker:
鈥傗€?/div>
R
L
= 8鈩?/div>
BTL, THD+N
鈮?/div>
1%
鈥?/div>
Headphone:
鈥傗€?/div>
R
L
= 32鈩?
SE, THD+N
鈮?/div>
1%
鈻犫€?/div>
Output power at V
DD
= 3.6V:
鈥?/div>
Speaker:
鈥傗€?/div>
R
L
= 8鈩?
BTL, THD+N
鈮?/div>
1%
鈻犫€?/div>
Output power at V
DD
= 3.3V:
632mW (typ)
1.3W (typ)
85mW (typ)
Applications
鈻?/div>
Mobile Phones
鈻?/div>
PDAs
鈻?/div>
Portable Electronics
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2008 National Semiconductor Corporation
300375
www.national.com

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