+VS C R C –V
參數(shù)資料
型號: AD8420ARMZ-RL
廠商: Analog Devices Inc
文件頁數(shù): 15/28頁
文件大?。?/td> 0K
描述: IC AMP INSTR RR 2.5KHZ 8MSOP
標(biāo)準(zhǔn)包裝: 3,000
放大器類型: 儀表
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 1 V/µs
-3db帶寬: 250kHz
電流 - 輸入偏壓: 20nA
電壓 - 輸入偏移: 250µV
電流 - 電源: 85µA
電流 - 輸出 / 通道: 10mA
電壓 - 電源,單路/雙路(±): 2.7 V ~ 36 V,±2.7 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 帶卷 (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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