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參數資料
| 型號： | LM4820MM-6 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Fixed Gain 1 Watt Audio Power Amplifier |
| 中文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數： | 4/18頁 |
| 文件大小： | 539K |
| 代理商： | LM4820MM-6 |
Electrical Characteristics V
DD
= 2.6V
(Notes 1, 2, 8)
The following specifications apply for V
DD
= 2.6V and 8
Load unless otherwise specified. Limits apply for T
A
= 25C.
Symbol
Parameter
Conditions
LM4820-6
Units
Typical
(Note 6)
2.6
0.1
0.2
0.4
0.08
44 (f =
217Hz)
44 (f =
1kHz)
6.0
Limit
(Note 7)
I
DD
I
SD
P
0
Quiescent Power Supply Current
Shutdown Current
Output Power ( 8
)
Output Power ( 4
)
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
V
IN
= 0V, I
o
= 0A
V
shutdown
= GND
THD = 1% (max); f = 1 kHz THD
= 1% (max); f = 1 kHz
P
o
= 0.1Wrms; f = 1kHz
V
ripple
= 200mV sine p-p
mA (max)
μA (max)
W
W
%
dB
THD+N
PSRR
A
V
Fixed Voltage Gain
.5V
in
rms, R
L
= 8
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 Characteristicsstate 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 LM4820-6, see power
derating curves for additional information.
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:
For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase I
SD
by a maximum of 2μA.
External Components Description
(Figure 1)
Components
2.
Functional Description
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
.
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
.
4.
C
S
5.
C
B
Typical Performance Characteristics
THD+N vs Frequency
at V
DD
= 5V, 8
R
L
, and PWR = 250mW
DS200106-37
THD+N vs Frequency
at V
DD
= 3.3V, 8
R
L
, and PWR = 150mW
DS200106-38
L
www.national.com
4
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