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参数资料
| 型号： | AD8221-EVAL |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 运动控制电子 |
| 英文描述： | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| 中文描述： | 单电源，轨至轨，低成本仪表放大器 |
| 文件页数： | 16/20页 |
| 文件大小： | 1283K |
| 代理商： | AD8221-EVAL |
AD8221
RF INTERFERENCE
RF rectification is often a problem when amplifiers are used in
applications where there are strong RF signals. The disturbance
may appear as a small dc offset voltage. High frequency signals
can be filtered with a low-pass R-C network placed at the input
of the instrumentation amplifier, as shown in Figure 49. The
filter limits the input signal bandwidth according to the
following relationship:
Rev. A | Page 16 of 20
C
D
affects the difference signal and C
C
affects the common-
mode signal. Values of R and C
C
should be chosen to minimize
RFI. Mismatch between the R × C
C
at the positive input and the
R × C
C
at negative input will degrade the AD8221’s CMRR. By
using a value of C
D
one magnitude larger than C
C
, the effect of
the mismatch is reduced, and hence, performance is improved.
PRECISION STRAIN GAGE
The AD8221’s low offset and high CMRR over frequency make
it an excellent candidate for bridge measurements. As shown in
Figure 50, the bridge can be directly connected to the inputs of
the amplifier.
)
2
R
π
2
1
C
D
Diff
C
C
FilterFreq
+
=
C
CM
RC
π
FilterFreq
2
1
=
+5V
+2.5V
0
10
μ
F
0.1
μ
F
AD8221
+IN
–IN
R
350
350
350
350
+
–
where
C
D
≥
10
C
C
.
R
R
AD8221
+15V
+IN
–IN
0.1
μ
F
10
μ
F
10
μ
F
0.1
μ
F
REF
V
OUT
–15V
R1
499
C
D
C
C
C
C
10nF
1nF
1nF
0
4.02k
4.02k
Figure 50. Precision Strain Gage
Figure 49. RFI Suppression
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