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AD8231 데이터시트(PDF) 16 Page - Analog Devices

부품명 AD8231
상세설명  Zero Drift, Digitally Programmable Instrumentation Amplifier
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AD8231 데이터시트(HTML) 16 Page - Analog Devices

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AD8231
Rev. 0 | Page 16 of 20
R
R
AD8231
+VS
+INA
–INA
0.1µF
10µF
10µF
0.1µF
REF
VOUT
–VS
CD
10nF
CC
1nF
CC
1nF
4.02kΩ
4.02kΩ
Figure 33. RFI Suppression
Figure 33 shows an example where the differential filter
frequency is approximately 2 kHz, and the common-mode filter
frequency is approximately 40 kHz.
Values of R and CC should be chosen to minimize RFI. Mismatch
between the R × CC at the positive input and the R × CC at
negative input degrades the CMRR of the AD8231. By using a
value of CD ten times larger than the value of CC, the effect of
the mismatch is reduced and performance is improved.
COMMON-MODE INPUT VOLTAGE RANGE
The 3-op amp architecture of the AD8231 applies gain and then
removes the common-mode voltage. Therefore, internal nodes
in the AD8231 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. To determine whether the signal could
be limited, refer to Figure 3 through Figure 5 or use the following
formula:
V
04
.
0
2
V
04
.
0
+
<
×
±
<
+
S
DIFF
CM
S
V
Gain
V
V
V
If more common mode range is required, the simplest solution is to
apply less gain in the instrumentation amplifier. The extra op amp
can be used to provide another gain stage after the in-amp. Because
the AD8231 has good offset and noise performance at low gains,
applying less gain in the instrumentation amplifier generally has a
limited impact on the overall system performance.


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