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AD8224ACPZ-R7 数据表(PDF) 23 Page - Analog Devices

部件名 AD8224ACPZ-R7
功能描述  Precision, Dual-Channel, JFET Input Rail-to-Rail Instrumentation Amplifier
PDF  27 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8224ACPZ-R7 数据表(HTML) 23 Page - Analog Devices

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Preliminary Technical Data
AD8224
1
FilterFreq
DIFF = 2πRC
G
1
FilterFreq
CM = 2πRC
G
+15V
1
FilterFreq
CM = 2πR(CC + C
G )
Mismatched CC capacitors result in mismatched low-pass filters.
The imbalance causes the AD8224 to treat what would have
been a common-mode signal as a differential signal. To reduce
the effect of mismatched external CC capacitors, select a value of
CD greater than 10 times CC. This sets the differential filter
frequency lower than the common-mode frequency.
+15V
AD8224
CG
CG
–VS
REF
–VS
R
R
+IN
–IN
0.1µF
10µF
0.1µF
10µF
+
+
R
R
AD8224
+IN
–IN
0.1µF
10µF
10µF
0.1µF
REF
VOUT
–15V
CD
CC
CC
10nF
1nF
1nF
4.02kΩ
4.02kΩ
+
+
Figure 62. RFI Suppression
COMMON-MODE INPUT VOLTAGE RANGE
VOUT
–15V
Figure 61. RFI Filtering Without External Capacitors
To eliminate high frequency common-mode signals while using
smaller source resistors, a low-pass R-C network can be placed
at the input of the instrumentation amplifier (see Figure 62).
The filter limits the input signal bandwidth according to the
following relationship:
1
FilterFreq
DIFF = 2πR(2 CD + CC + C
G )
The three op amp architecture of the AD8224 applies gain and
then removes the common-mode voltage. Therefore, internal
nodes in the AD8224 experience a combination of both the
gained signal and the common-mode signal. This combined
signal can be limited by the voltage supplies even when the
individual input and output signals are not. Figure 26, Figure 27,
Figure 28, and Figure 29 show the allowable common-mode
input voltage ranges for various output voltages, supply voltages,
and gains.
Rev. PrB | Page 23 of 27



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