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AD8421 датащи(PDF) 23 Page - Analog Devices

номер детали AD8421
подробное описание детали  Precision Instrumentation Amplifier with Level Shift and Output Clamping
PDF  28 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD8421 датащи(HTML) 23 Page - Analog Devices

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LT6372-1
23
Rev. 0
For more information www.analog.com
APPLICATIONS INFORMATION
Figure 9.
V–
V+
IN+
IN–
6372-1 F09
VOUT
RG
CC
10n
CC
10n
CD
100n
R
1.54k
R
1.54k
EXTERNAL RFI
FILTER
LT6372-1
f–3dB ≈ 500Hz
Adding a Simple External RC Filter at the Inputs to
an Instrumentation Amplifier Is Effective in Further Reducing
Rectification of High Frequency Out-Of-Band Signals
To avoid any possibility of common mode to differential
mode signal conversion, match the common mode low-
pass filter on each input to 1% or better. Here are the steps
to help determine appropriate values for the filter:
1. Pick R and CD to have a low pass pole at least 10x
higher than the highest signal of interest (e.g. 500Hz for
a 50Hz signal) using:
FilterFreqDIFF =
1
2πR(2CD+CC)
=
1
2πR(2CD+0.1CD)
=
1
4.2πRCD
2. Select CC = CD/10.
If implemented this way, the common-mode pole fre-
quency is placed about 20x higher than the differential
pole frequency. Here are the differential and common-
mode low pass pole frequencies for the values shown in
Figure 9:
FilterFreqDIFF = 500Hz
FilterFreqCM = 10kHz



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