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PDF LM4888 Data sheet ( Hoja de datos )
| Número de pieza | LM4888 | |
| Descripción | Dual 2.1W Audio Amplifier Plus Stereo Headphone | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM4888 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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www.DataSheet4U.com
June 2005
LM4888
Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D
Enhancement
General Description
The LM4888 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.
A user selectable “National 3D Enhancement” mode pro-
vides enhanced stereo imaging.
The LM4888SQ also has two separate HP (headphone)
enable inputs, each having different logic level thresholds.
Either HP enable input activates the single ended head-
phone mode and disables the BTL output mode. The HP
Sense input is for use with a normal stereo headphone jack.
The remaining input, HP Logic, accepts standard logic level
thresholds.
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 LM4888SQ combines dual
bridge speaker amplifiers and stereo headphone amplifiers
on one chip.
The LM4888SQ features a low-power consumption shut-
down mode and thermal shutdown protection. It also utilizes
circuitry to reduce “clicks and pops” during device turn-on.
Note 1: An LM4888SQ 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 LM4888SQ.
Note 2: An LM4888SQ 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, VDD = 5V
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)
2.7V to 5.5V
85dB (typ)
Features
n National 3D Enhancement
n Selectable headphone enable modes
n Stereo headphone amplifier mode
n Improved “click and pop” suppression circuitry
n Thermal shutdown protection circuitry
n PCB area-saving SQ package
n Micro power shutdown mode
Applications
n Cell phones
n Multimedia monitors
n Portable and desktop computers
n Portable audio systems
Connection Diagrams
LM4888SQ
LM4888SQ Top Mark
20111602
Top View
Order Number LM4888SQ
See NS Package Number SQA24A
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS201116
201116C6
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
LM4888
Typical Limit
(Note 8) (Note 9)
IDD
ISD
VIH
VIL
VIHSD
Quiescent Power Supply Current
Shutdown Current
Headphone High Input Voltage
Headphone Low Input Voltage
Shutdown, Headphone micro,
3D Control
VIN = 0V, IO = 0A (Note 10) , BTL mode
VIN = 0V, IO = 0A (Note 10) , SE mode
GND applied to the SHUTDOWN pin
4.5
2.5
0.01
2.2
1.5
1
1.4
High Input voltage
VILSD
Shutdown, Headphone micro,
3D Control
0.8 .4
Low Input voltage
TWU
Turn On Time
1µF Bypass Cap (C6)
140
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
LM4888
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)
LM4888SQ, RL = 3Ω
LM4888SQ, RL = 4Ω
LM4888SQ, RL = 8Ω
THD+N = 10%, f = 1kHz (Note 12)
.82
.70
.43
LM4888SQ, RL = 3Ω
LM4888SQ, RL = 4Ω
LM4888SQ, RL = 8Ω
1kHz
1.0
.85
.53
THD+N
Total Harmonic Distortion+Noise
LM4888SQ, RL = 4Ω, PO = 280mW
LM4888SQ, RL = 8Ω, PO = 200mW
Input Unterminated, 217Hz
0.1
0.05
90
Vripple = 200mVp-p
C6= 1µF, RL = 8Ω
Input Unterminated, 1kHz
80
PSRR Power Supply Rejection Ratio
Vripple = 200mVp-p
C6= 1µF, RL = 8Ω
Input grounded, 217Hz
65
Vripple = 200mVp-p
C6= 1µF, RL = 8Ω
Input grounded, 1kHz
73
XTALK
VNO
Channel Separation
Output Noise Voltage
Vripple = 200mVp-p
C6= 1µF, RL = 8Ω
f = 1kHz, C6 = 1.0µF, 3D Control = Low
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)
Frequency Response
5V, 8Ω, BTL
Frequency Response
3V, 8Ω, BTL
Frequency Response
5V, 32Ω, SE
20111659
Frequency Response
3V, 32Ω, SE
20111661
Crosstalk
5V, 8Ω, BTL
20111662
Crosstalk
3V, 8Ω, BTL
20111660
20111613
11
20111611
www.national.com
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LM4888.PDF ] | |
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