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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  28 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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AD8224
Rev. B | Page 23 of 28
The relationship between external, matched series resistors and the
internal gate capacitance is expressed as
For applications where the AD8224 encounters extreme
overload voltages, as in cardiac defibrillators, external series
resistors and low leakage diode clamps, such as BAV199Ls,
FJH1100s, or SP720s, should be used.
G
DIFF
RC
FilterFreq
π
=
2
1
TRANSFORMER
+VS
REF
–VS
AD8224
INCORRECT
TRANSFORMER
+VS
REF
–VS
AD8224
CORRECT
CAPACITIVELY COUPLED
+VS
REF
C
C
–VS
AD8224
CAPACITIVELY COUPLED
+VS
REF
C
R
R
C
–VS
AD8224
1
fHIGH-PASS = 2πRC
G
CM
RC
FilterFreq
π
=
2
1
To eliminate high frequency common-mode signals while using
smaller source resistors, a low-pass RC network can be placed at
the input of the instrumentation amplifier (see Figure 61). The
filter limits the input signal bandwidth according to the
following relationship:
)
2
(
2
1
G
C
D
DIFF
C
C
C
R
FilterFreq
+
+
π
=
)
(
2
1
G
C
CM
C
C
R
FilterFreq
+
π
=
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.
Figure 59. Creating an IBIAS Path
R
R
AD8224
+15V
+IN
–IN
0.1µF
10µF
10µF
0.1µF
REF
VOUT
–15V
CD
CC
CC
10nF
1nF
1nF
4.02kΩ
4.02kΩ
+
+
RF INTERFERENCE
RF rectification is often a problem in applications where there are
large RF signals. The problem appears as a small dc offset voltage.
The AD8224 by its nature has a 5 pF gate capacitance (CG) at its
inputs. Matched series resistors form a natural low-pass filter that
reduces rectification at high frequency (see Figure 60).
AD8224
VOUT
CG
CG
–VS
REF
–VS
R
R
+IN
–IN
+15V
–15V
0.1µF
10µF
0.1µF
10µF
+
+
Figure 61. RFI Suppression
COMMON-MODE INPUT VOLTAGE RANGE
The 3-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 24 through Figure 27 show the
allowable common-mode input voltage ranges for various
output voltages, supply voltages, and gains.
Figure 60. RFI Filtering Without External Capacitors



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