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AD8553 датащи(PDF) 14 Page - Analog Devices

номер детали AD8553
подробное описание детали  Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
PDF  20 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD8553 датащи(HTML) 14 Page - Analog Devices

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AD8426
Preliminary Technical Data
Rev. PrD | Page 14 of 20
limiting resistors and low leakage diode clamps such as the
BAV199, the FJH1100s, or the SP720 should be used.
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 13). The filter limits both the differential
and common-mode bandwidth, as shown in the following
equations:
)
2
(
π
2
1
C
D
DIFF
C
C
R
uency
FilterFreq
C
CM
RC
uency
FilterFreq
π
2
1
where CD  10 CC.
R
R
AD8426
+VS
+IN
–IN
0.1µF
10µF
10µF
0.1µF
REF
VOUT
–VS
RG
CD
10nF
CC
1nF
CC
1nF
4.02kΩ
4.02kΩ
Figure 13. RFI Suppression
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.



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