參數(shù)資料
型號： AD8426ACPZ-R7
廠商： Analog Devices Inc
文件頁數(shù)： 17/28頁
文件大?。?/td> 0K
描述： IC AMP INSTR RR 1.5MHZ 16LFCSP
標(biāo)準(zhǔn)包裝： 1
放大器類型： 儀表
電路數(shù)： 2
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 0.6 V/µs
-3db帶寬： 1MHz
電流 - 輸入偏壓： 20nA
電壓 - 輸入偏移： 200µV
電流 - 電源： 350µA
電流 - 輸出 / 通道： 13mA
電壓 - 電源，單路/雙路(±)： 2.2 V ~ 36 V，±1.35 V ~ 18 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 16-VQFN，CSP
供應(yīng)商設(shè)備封裝： 16-LFCSP（4x4）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： AD8426ACPZ-R7DKR
AD8426
Rev. 0 | Page 24 of 28
INPUT BIAS CURRENT RETURN PATH
The other AD8426 terminals should be kept within the supplies.
All terminals of the AD8426 are protected against ESD.
The input bias current of the AD8426 must have a return path
to ground. When the source, such as a thermocouple, cannot
provide a current return path, one should be created, as shown
For applications where the AD8426 encounters voltages beyond
the allowed limits, external current limiting resistors and low
leakage diode clamps such as the BAV199L, the FJH1100, or the
SP720 should be used.
THERMOCOUPLE
+VS
REF
–VS
AD8426
CAPACITIVELY COUPLED
+VS
REF
C
–VS
AD8426
TRANSFORMER
+VS
REF
–VS
AD8426
INCORRECT
CAPACITIVELY COUPLED
+VS
REF
C
R
C
–VS
AD8426
1
fHIGH-PASS = 2πRC
THERMOCOUPLE
+VS
REF
–VS
10M
AD8426
TRANSFORMER
+VS
REF
–VS
AD8426
CORRECT
09490-
007
RADIO FREQUENCY INTERFERENCE (RFI)
RF interference is often a problem when amplifiers are used in
applications where there are strong RF signals. The precision
circuits in the AD8426 can rectify the RF signals so that they
appear as a dc offset voltage error. To avoid this rectification,
place a low-pass RC filter at the input of the instrumentation
amplifier (see Figure 67). The filter limits both the differential
and common-mode bandwidth, as shown in the following
equations:
)
2
(
π
2
1
C
D
DIFF
C
R
uency
FilterFreq
+
=
C
CM
RC
uency
FilterFreq
π
2
1
=
where CD ≥ 10 CC.
R
AD8426
+VS
+IN
–IN
0.1F
10F
0.1F
REF
OUT
–VS
RG
CD
10nF
CC
1nF
CC
1nF
4.02k
09
49
0-
00
8
Figure 67. RFI Suppression
Figure 66. Creating an Input Bias Current Return Path
CD affects the differential signal, and CC affects the common-
mode signal. Values of R and CC should be chosen to minimize
RFI. Any mismatch between the R × CC at the positive input
and the R × CC at the negative input degrades the CMRR of the
AD8426. By using a value of CD one order of magnitude larger
than CC, the effect of the mismatch is reduced, and performance
is improved.
INPUT PROTECTION
The AD8426 has very robust inputs and typically does not
need additional input protection. Input voltages can be up to
40 V from the opposite supply rail. For example, with a +5 V
positive supply and a 8 V negative supply, the part can safely
withstand voltages from 35 V to +32 V. Unlike some other
instrumentation amplifiers, the part can handle large differen-
tial input voltages even when the part is in high gain. Figure 16,
Figure 17, Figure 19, and Figure 20 show the behavior of the
part under overvoltage conditions.
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