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LM4883SQ Datasheet

  • LM4883SQ

  • Dual 2.1W Audio Amplifier Plus Stereo Headphone

  • 23頁

  • NSC

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LM4883 Dual 2.1W Audio Amplifier Plus Stereo Headphone Function
November 2004
LM4883
Dual 2.1W Audio Amplifier Plus Stereo Headphone
Function
General Description
The LM4883 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.1W
to a 4鈩?load (Note 1) or 2.4W to a 3鈩?load (Note 2) with less
than 1.0% THD+N. In addition, the headphone input pin
allows the amplifiers to operate in single-ended mode when
driving stereo headphones. A MUX control pin allows selec-
tion between the two stereo sets of amplifier inputs. The
MUX control can also be used to select two different closed-
loop responses.
Boomer audio power amplifiers were designed specifically to
provide high quality output power from a surface mount
package while requiring few external components. To sim-
plify audio system design, the LM4883SQ combines dual
bridge speaker amplifiers and stereo headphone amplifiers
on one chip.
The LM4883SQ features an internally controlled, low-power
consumption shutdown mode, a stereo headphone amplifier
mode, and thermal shutdown protection. It also utilizes cir-
cuitry to reduce 鈥渃licks and pops鈥?during device turn-on.
Note 1:
An LM4883SQ that has been properly mounted to a circuit board
will deliver 2.1W into 4鈩? See the Application Information sections for further
information concerning the LM4883SQ.
Note 2:
An LM4883SQ that has been properly mounted to a circuit board
and forced-air cooled will deliver 2.4W into 3鈩?
Key Specifications
j
P
O
at 1% THD+N
R
L
= 3鈩?/div>
R
L
= 4鈩?/div>
R
L
= 8鈩?/div>
j
Single-ended mode THD+N
2.4W (typ)
2.1W (typ)
1.3W (typ)
0.01% (typ)
0.04碌A(chǔ) (typ)
2.4V to 5.5V
85dB (typ)
at 75mW into 32鈩?(5V, 1kHz)
j
Shutdown current
j
Supply voltage range
j
PSRR at 217Hz
Features
n
n
n
n
n
Input mux control and two separate inputs per channel
Stereo headphone amplifier mode
Improved 鈥渃lick and pop鈥?suppression circuitry
Thermal shutdown protection circuitry
PCB area-saving SQ package
Applications
n
Multimedia monitors
n
Portable and desktop computers
n
Portable audio systems
Connection Diagrams
LM4883SQ
LM4883SQ Top Mark
200887C6
Top View
U = Fab Code
Z = Assembly Plant Code
XY = Date Code
TT = Die Traceability
200887A3
Top View
Order Number LM4883SQ
See NS Package Number SQA24B
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2004 National Semiconductor Corporation
DS200887
www.national.com

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