AD8222 View Datasheet(PDF) - Analog Devices
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AD8222 Datasheet PDF : 24 Pages
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Data Sheet
The AD8222 should be decoupled with 0.1 μF bypass capacitors,
one for each supply. The positive supply decoupling capacitor
should be placed near Pin 16, and the negative supply decoupl-
ing capacitor should be placed near Pin 8. Each supply should
also be decoupled with a 10 μF tantalum capacitor. The tantalum
capacitor can be placed further away from the AD8222 and can
generally be shared by other precision integrated circuits. Figure 47
shows an example layout.
0.1µF
16 15 14 13
AD8222
1
12
2
RG1
3
11
RG2
10
4
9
5 6 78
0.1µF
Figure 47. Example Layout
AD8222
INPUT BIAS CURRENT RETURN PATH
The input bias current of the AD8222 must have a return path
to common. When the source, such as a thermocouple, cannot
provide a return current path, one should be created, as shown
in Figure 48.
INCORRECT
+VS
CORRECT
+VS
AD8222
REF
–VS
TRANSFORMER
+VS
AD8222
REF
–VS
TRANSFORMER
+VS
AD8222
REF
–VS
THERMOCOUPLE
AD8222
REF
10MΩ
–VS
THERMOCOUPLE
+VS
C
+VS
C
AD8222
fHIGH-PASS
=
1
2πRC
R
AD8222
C
REF
C
REF
R
–VS
CAPACITIVELY COUPLED
–VS
CAPACITIVELY COUPLED
Figure 48. Creating an IBIAS Path
Rev. B | Page 17 of 24
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