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LM49450 Datasheet

  • LM49450

  • I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-...

  • 38頁

  • NSC

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LM49450 I
2
S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground
Referenced Headphone Amplifier, 3D Enhancement, and Headphone Sense
February 14, 2008
LM49450
鈥?/div>
I
2
S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio
Sub-System with Ground Referenced Headphone
Amplifier, 3D Enhancement, and Headphone Sense
General Description
The LM49450 is a fully integrated audio subsystem designed
for portable media player applications. The LM49450 com-
bines a 24-bit I
2
S digital-to-analog converter (DAC), 2.5W/
channel stereo Class D speaker drivers, 36mW stereo ground
referenced headphone drivers, volume control, and
National鈥檚 unique 3D sound enhancement into a single de-
vice.
The filterless Class D amplifiers deliver 1.25W/channel into
an 8鈩?load with <1% THD+N with a 5V supply. The LM49450
offers two logic selectable modulation schemes, fixed fre-
quency mode, and an EMI reducing spread spectrum mode.
The 36mW/channel headphone drivers feature National鈥檚
ground referenced architecture that creates a ground-refer-
enced output from a single supply, eliminating the need for
bulky and expensive DC-blocking capacitors, saving space
and minimizing system cost. A headphone sense input (HPS)
automatically detects the presence of a headphone, and con-
figures the device accordingly.
The LM49450 stereo, 24-bit DAC supports a wide range of
sample rates (including 192kHz, 96kHz, 48kHz, and
44.1kHz). The digital audio signal path features better than
100dB SNR, and low 0.05% THD+N when measured at the
headphone outputs. The flexible 3-wire I
2
S interface supports
left or right justified audio data.
The LM49450 features separate 32-step volume control for
the headphones and speaker outputs. 3D enhancement,
mode selection, shutdown control, and volume are controlled
through an I
2
C compatible interface.
Output short circuit and thermal overload 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. The LM49450 is
available in a space saving 32-pin LLP package.
鈻犫€?/div>
Output Power/Channel
鈥?/div>
Speaker at LSV
DD
= 5V:
R
L
= 4鈩?
THD+N
鈮?/div>
10%
R
L
= 8鈩?
THD+N
鈮?/div>
1%
2.5W (typ)
1.25W (typ)
鈥?/div>
Headphone at HPV
DD
= 2.5V:
R
L
= 16鈩?
THD+N
鈮?/div>
1%
R
L
= 32鈩?
THD+N
鈮?/div>
1%
34mW (typ)
36mW (typ)
67dB ( typ)
77dB (typ)
0.02渭A
(typ)
鈻犫€?/div>
PSRR at 1kHz
Speaker Mode
Headphone Mode
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>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
24鈥揃it Stereo DAC
Stereo Filterless Class D Operation
Selectable spread spectrum mode reduces EMI
Ground Referenced Headphone Amplifiers with 100dB
SNR
I
2
S Compatible Audio Interface
Audio Sample Rates up to 192kHz
National鈥檚 3D Enhancement
32-step Digital Volume Control
I
2
C Compatible Control Interface
Headphone Sense Input
Stereo Analog Line Inputs
Output Short Circuit Protection
Thermal Overload Protection
Minimum external components
Click and Pop suppression
Micro-power shutdown
Available in space-saving 32 pin LLP package
Key Specifications
鈻犫€?/div>
SNR at Headphone Output
鈻犫€?/div>
Speaker Amplifier Efficiency
at 3.6V, 650mW/channel into 8鈩?/div>
87% (typ)
80% (typ)
102dBA (typ)
鈻犫€?/div>
Speaker Amplifier Efficiency
at 5V, 1.1W/channel into 8鈩?/div>
Applications
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Portable Media Players
Portable Navigation Devices
Multi-Media Monitors
Laptops
Portable Gaming Devices
Mobile Handsets
鈻犫€?/div>
Quiescent Power Supply Current
Line Inputs:
鈥?/div>
Speaker Mode at LSV
DD
= 3.6V
鈥?/div>
Headphone Mode at HPV
DD
= 2.5V
7.5mA (typ)
5.3mA (typ)
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2008 National Semiconductor Corporation
300455
www.national.com

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