AD8222ACPZ-R7 データシートの表示（PDF） - Analog Devices

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AD8222ACPZ-R7

Precision, Dual-Channel Instrumentation Amplifier

Analog Devices 

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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