参数资料
型号: AD8221BR-REEL7
厂商: Analog Devices Inc
文件页数: 13/24页
文件大小: 0K
描述: IC AMP INST PREC LN 18MA 8SOIC
产品培训模块: Power Line Monitoring
Instrument Amp Primer Overview
设计资源: Low Cost, High Voltage, Programmable Gain Instrumentation Amplifier Using AD5292 and AD8221 (CN0114)
Low Cost Programmable Gain Instrumentation Amplifier Circuit Using ADG1611 and AD620 (CN0146)
标准包装: 1,000
放大器类型: 仪表
电路数: 1
转换速率: 2 V/µs
-3db带宽: 825kHz
电流 - 输入偏压: 200pA
电压 - 输入偏移: 25µV
电流 - 电源: 900µA
电流 - 输出 / 通道: 18mA
电压 - 电源,单路/双路(±): 4.6 V ~ 36 V,±2.3 V ~ 18 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SO
包装: 带卷 (TR)
AD8221
Rev. C | Page 20 of 24
RF INTERFERENCE
RF rectification is often a problem when amplifiers are used in
applications where there are strong RF signals. The disturbance
can appear as a small dc offset voltage. High frequency signals
can be filtered with a low-pass RC 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:
)
2
(
π
2
1
C
D
Diff
C
R
FilterFreq
+
=
C
CM
RC
FilterFreq
π
2
1
=
where CD ≥ 10CC.
R
AD8221
+15V
+IN
–IN
0.1F
10F
0.1F
REF
VOUT
–15V
R1
499
CD
CC
10nF
1nF
03149-
048
4.02k
4.02k
Figure 49. RFI Suppression
CD affects the difference signal, and CC affects the common-
mode signal. Values of R and CC should be chosen to minimize
RFI. Mismatch between the R × CC at the positive input and the
R × CC at the negative input degrades the CMRR of the AD8221.
By using a value of CD one magnitude larger than CC, the effect
of the mismatch is reduced, and therefore, performance is
improved.
PRECISION STRAIN GAGE
The low offset and high CMRR over frequency of the AD8221
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.
+5V
+2.5V
03149-
049
10F
0.1F
AD8221
+IN
–IN
R
350
350
350
350
+
Figure 50. Precision Strain Gage
CONDITIONING ±10 V SIGNALS FOR A +5 V
DIFFERENTIAL INPUT ADC
There is a need in many applications to condition ±10 V signals.
However, many of today’s ADCs and digital ICs operate on
much lower, single-supply voltages. Furthermore, new ADCs
have differential inputs because they provide better common-
mode rejection, noise immunity, and performance at low supply
voltages. Interfacing a ±10 V, single-ended instrumentation
amplifier to a +5 V, differential ADC can be a challenge.
Interfacing the instrumentation amplifier to the ADC requires
attenuation and a level shift. A solution is shown in Figure 51.
+12V
+IN
–IN
0.1F
10F
0.1F
10F
–12V
R3
1k
+2.5V
R4
1k
REF
R5
499
R2
10k
R1
10k
C1
470pF
+12V
0.1F
–12V
+12V
+5V
0.1F
10nF
0.1F
–12V
+12V
0.1F
–12V
R6
27.4
R7
27.4
C2
220F
10F
0.1F
22F
+5V
2.5V
220nF
10nF
AD8221
AD8022
OP27
AD8022
AD7723
VIN(+)
AVDD
AGND DGND REF1 REF2
DVDD
VIN(–)
AD780
GND
+VIN
VOUT
03149-
050
()
Figure 51. Interfacing to a Differential Input ADC
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