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AD8553 Datasheet(PDF) 22 Page - Analog Devices

Part No. AD8553
Description  Wide Supply Range, Micropower,
Download  28 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD8553 Datasheet(HTML) 22 Page - Analog Devices

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AD8420
Data Sheet
Rev. 0 | Page 22 of 28
CAPACITIVELY COUPLED
+VS
C
R
R
C
–VS
AD8420
1
fHIGH-PASS = 2πRC
THERMOCOUPLE
+VS
–VS
10MΩ
AD8420
TRANSFORMER
+VS
–VS
AD8420
CORRECT
VOUT
VOUT
THERMOCOUPLE
+VS
–VS
AD8420
CAPACITIVELY COUPLED
+VS
C
C
–VS
AD8420
TRANSFORMER
+VS
–VS
AD8420
INCORRECT
VOUT
VOUT
VOUT
VOUT
Figure 65. Creating an IBIAS Path
INPUT BIAS CURRENT RETURN PATH
The input bias current of the AD8420 must have a return path
to ground. When the source, such as a thermocouple, cannot
provide a return current path, create one, as shown in Figure 65.
RADIO FREQUENCY INTERFERENCE (RFI)
All instrumentation amplifiers can rectify high frequency out-of-
band signals. Once rectified, these signals appear as dc offset errors
at the output. High frequency signals can be filtered with a low-pass
RC network placed at the input of the instrumentation amplifier, as
shown in Figure 66. The filter limits the input signal bandwidth
according to the following relationship:
)
2
(
π
2
1
C
D
DIFF
C
C
R
uency
FilterFreq
+
=
C
CM
RC
uency
FilterFreq
π
2
1
=
where CD ≥ 10 C
VOUT
R1
R2
+IN
+VS
–VS
CC
330pF
5%
CC
330pF
5%
10µF
10µF
CD
3300pF
0.1µF
0.1µF
R
20kΩ
1%
R
20kΩ
1%
AD8420
–IN
Figure 66. Suggested RFI Suppression Filter
CD affects the differential signal and CC affects the common-mode
signal. Values of R and CC are chosen to minimize out of band
RFI at the expense of reduced signal bandwidth. Mismatch
between the R × CC at the positive input and the R × CC at the
negative input degrades the CMRR of the AD8420. By using a
value of CD that is at least one magnitude larger than CC, the
effect of the mismatch is reduced and performance is improved.
C
.


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