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PDF LM4883 Data sheet ( Hoja de datos )
| Número de pieza | LM4883 | |
| Descripción | Dual 2.1W Audio Amplifier Plus Stereo Headphone | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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 4Ω load (Note 1) or 2.4W to a 3Ω 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 “clicks and pops” during device turn-on.
Note 1: An LM4883SQ that has been properly mounted to a circuit board
will deliver 2.1W into 4Ω. 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 3Ω.
Key Specifications
j PO at 1% THD+N
RL = 3Ω
RL = 4Ω
RL = 8Ω
j Single-ended mode THD+N
at 75mW into 32Ω (5V, 1kHz)
j Shutdown current
j Supply voltage range
j PSRR at 217Hz
2.4W (typ)
2.1W (typ)
1.3W (typ)
0.01% (typ)
0.04µA (typ)
2.4V to 5.5V
85dB (typ)
Features
n Input mux control and two separate inputs per channel
n Stereo headphone amplifier mode
n Improved “click and pop” suppression circuitry
n Thermal shutdown protection circuitry
n PCB area-saving SQ package
Applications
n Multimedia monitors
n Portable and desktop computers
n Portable audio systems
Connection Diagrams
LM4883SQ
LM4883SQ Top Mark
200887A3
Top View
Order Number LM4883SQ
See NS Package Number SQA24B
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200887
200887C6
Top View
U = Fab Code
Z = Assembly Plant Code
XY = Date Code
TT = Die Traceability
www.national.com
1 page  
Electrical Characteristics (3V) (Notes 3, 7, 13)
The following specifications apply for VDD = 3V unless otherwise noted. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4883
Typical Limit
(Note 8) (Note 9)
IDD
ISD
VIH
VIL
VIHSD
VILSD
TWU
Quiescent Power Supply Current
Shutdown Current
Headphone High Input Voltage
Headphone Low Input Voltage
Shutdown High Input Voltage
Shutdown Low Input Voltage
Turn On Time
VIN = 0V, IO = 0A (Note 10) , HP-IN = 0V
VIN = 0V, IO = 0A (Note 10) , HP-IN = 4V
VDD applied to the SHUTDOWN pin
1µF Bypass Cap (C5)
4.5
2.5
0.01
2.2
1.5
140
0.7VDD
0.3VDD
Units
(Limits)
mA
mA
µA
V
V
V (min)
V (max)
ms
Electrical Characteristics for Bridged-Mode Operation (3V) (Notes 3, 7, 13)
The following specifications apply for VDD = 3V unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4883
Typical Limit
(Note 8) (Note 9)
VOS Output Offset Voltage
VIN = 0V
THD+N = 1%, f = 1kHz (Note 12)
5
PO Output Power (Note 11)
LM4883SQ, RL = 3Ω
LM4883SQ, RL = 4Ω
LM4883SQ, RL = 8Ω
THD+N = 10%, f = 1kHz (Note 12)
.82
.70
.43
LM4883SQ, RL = 3Ω
LM4883SQ, RL = 4Ω
LM4883SQ, RL = 8Ω
1kHz
1.0
.85
.53
THD+N
Total Harmonic Distortion+Noise
LM4883SQ, RL = 4Ω, PO = 280mW
LM4883SQ, RL = 8Ω, PO = 200mW
Input Floating, 217Hz
0.1
0.05
90
Vripple = 200mVp-p
CB = 1µF, RL = 8Ω
Input Floating, 1kHz
80
PSRR Power Supply Rejection Ratio
Vripple = 200mVp-p
CB = 1µF, RL = 8Ω
Input grounded, 217Hz
65
Vripple = 200mVp-p
CB = 1µF, RL = 8Ω
Input grounded, 1kHz
73
XTALK
VNO
Channel Separation
Output Noise Voltage
Vripple = 200mVp-p
CB = 1µF, RL = 8Ω
f = 1kHz, CB = 1.0µF
1kHz, A-weighted
85
21
Units
(Limits)
mV
W
W
W
W
W
W
%
%
dB
dB
dB
dB
dB
µV
5 www.national.com
5 Page 
Typical Performance Characteristics (Continued)
PSRR
3V, 32Ω, SE, Input Unterminated
PSRR
3V, 32Ω, SE, Input Terminated
Frequency Response
5V, 8Ω, BTL
20088765
Frequency Response
3V, 8Ω, BTL
20088766
Frequency Response
5V, 32Ω, SE
20088759
Frequency Response
3V, 32Ω, SE
20088761
20088762
11
20088760
www.national.com
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet LM4883.PDF ] | |
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