参数资料
型号: AD8420ARMZ-RL
厂商: Analog Devices Inc
文件页数: 15/28页
文件大小: 0K
描述: IC AMP INSTR RR 2.5KHZ 8MSOP
标准包装: 3,000
放大器类型: 仪表
电路数: 1
输出类型: 满摆幅
转换速率: 1 V/µs
-3db带宽: 250kHz
电流 - 输入偏压: 20nA
电压 - 输入偏移: 250µV
电流 - 电源: 85µA
电流 - 输出 / 通道: 10mA
电压 - 电源,单路/双路(±): 2.7 V ~ 36 V,±2.7 V ~ 18 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 带卷 (TR)
AD8420
Data Sheet
Rev. 0 | Page 22 of 28
CAPACITIVELY COUPLED
+VS
C
R
C
–VS
AD8420
1
fHIGH-PASS = 2πRC
THERMOCOUPLE
+VS
–VS
10M
AD8420
TRANSFORMER
+VS
–VS
AD8420
CORRECT
VOUT
THERMOCOUPLE
+VS
–VS
AD8420
CAPACITIVELY COUPLED
+VS
C
–VS
AD8420
TRANSFORMER
+VS
–VS
AD8420
INCORRECT
VOUT
09
94
5-
06
1
Figure 65. Creating an IBIAS Path
INPUT BIAS CURRENT RETURN PATH
The input bias current of the AD8420 must have a return path
to ground. When the source, such as a thermocouple, cannot
provide a return current path, create one, as shown in Figure 65.
RADIO FREQUENCY INTERFERENCE (RFI)
All instrumentation amplifiers can rectify high frequency out-of-
band signals. Once rectified, these signals appear as dc offset errors
at the output. High frequency signals can be filtered with a low-pass
RC network placed at the input of the instrumentation amplifier, as
shown in Figure 66. The filter limits the input signal bandwidth
according to the following relationship:
)
2
(
π
2
1
C
D
DIFF
C
R
uency
FilterFreq
+
=
C
CM
RC
uency
FilterFreq
π
2
1
=
where CD ≥ 10 C
VOUT
R1
R2
+IN
+VS
–VS
CC
330pF
5%
CC
330pF
5%
10F
CD
3300pF
0.1F
R
20k
1%
R
20k
1%
AD8420
–IN
09
945
-06
4
Figure 66. Suggested RFI Suppression Filter
CD affects the differential signal and CC affects the common-mode
signal. Values of R and CC are chosen to minimize out of band
RFI at the expense of reduced signal bandwidth. Mismatch
between the R × CC at the positive input and the R × CC at the
negative input degrades the CMRR of the AD8420. By using a
value of CD that is at least one magnitude larger than CC, the
effect of the mismatch is reduced and performance is improved.
C
.
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