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參數(shù)資料
| 型號： | LM4878IBPX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 Watt Audio Power Amplifier in micro SMD package with Shutdown Logic Low |
| 中文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| 封裝： | MICRO, SMD-8 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 515K |
| 代理商： | LM4878IBPX |
Electrical Characteristics V
DD
= 2.6V
(Notes 1, 2, 8, 9)
The following specifications apply for V
DD
= 2.6V and 8
Load unless otherwise specified. Limits apply for T
A
=
25C. (Continued)
Symbol
Parameter
Conditions
LM4878
Units
(Limits)
Typical
(Note 6)
5
0.25
0.5
0.25
Limit
(Note 7)
V
OS
P
0
Output Offset Voltage
Output Power ( 8
)
Output Power ( 4
)
Total Harmonic Distortion+Noise
V
IN
= 0V
THD = 0.3% (max); f = 1 kHz THD
= 0.5% (max); f = 1 kHz
P
o
= 0.25 Wrms; A
VD
= 2; 20 Hz
≤
f
≤
20 kHz
V
DD
= 2.5V to 2.7V
mV (max)
W
W
%
THD+N
PSRR
Power Supply Rejection Ratio
65
dB
Note 1:
All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2:
Absolute Maximum Ratings
indicate limits beyond which damage to the device may occur.
Operating Ratings
indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Electrical Characteristics
state DC andAC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 3:
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
,
θ
JA
, and the ambient temperature T
A
. The maximum
allowable power dissipation is P
DMAX
= (T
JMAX
–T
A
)/
θ
JA
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4878, T
JMAX
= 150C.
The typical junction-to-ambient thermal resistance is 150C/W.
Note 4:
Human body model, 100 pF discharged through a 1.5 k
resistor.
Note 5:
Machine Model, 220 pF–240 pF discharged through all pins.
Note 6:
Typicals are measured at 25C and represent the parametric norm.
Note 7:
Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8:
Low Voltage Circuit - See Fig. 4
Note 9:
Shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase I
SD
by a maximum of 2μA.
Electrical Characteristics V
DD
= 5/3.3/2.6V Shutdown Input
Symbol
Parameter
Conditions
LM4878
Units
(Limits)
V(min)
V(max)
Typical
Limit
1.2
0.4
V
IH
V
IL
Shutdown Input Voltage High
Shutdown Input Voltage Low
External Components Description
(
Figure 1
)
Components
1.
Functional Description
R
i
Inverting input resistance which sets the closed-loop gain in conjunction with R
f
. This resistor also forms a
high pass filter with C
i
at f
C
= 1/(2
π
R
i
C
i
).
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a
highpass filter with R
i
at f
c
= 1/(2
π
R
i
C
i
). Refer to the section,
Proper Selection of External Components
,
for an explanation of how to determine the value of C
i
.
Feedback resistance which sets the closed-loop gain in conjunction with R
i
.
Supply bypass capacitor which provides power supply filtering. Refer to the
Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
Bypass pin capacitor which provides half-supply filtering. Refer to the section,
Proper Selection of External
Components
, for information concerning proper placement and selection of C
B
.
2.
C
i
3.
4.
R
f
C
S
5.
C
B
L
www.national.com
4
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