AD8222HACPZ-R7 datasheet(17/24 Pages) AD

17 / 24 page

AD8222

Rev. A | Page 17 of 24

both pins should be connected for specified performance and

optimum reliability.

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

46 shows an example layout.

AD8222

0.1µF

RG1

RG2

Figure 46. Example Layout

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 47.

THERMOCOUPLE

+VS

REF

–VS

AD8222

CAPACITIVELY COUPLED

+VS

REF

–VS

AD8222

TRANSFORMER

+VS

REF

–VS

AD8222

INCORRECT

CAPACITIVELY COUPLED

+VS

REF

–VS

AD8222

fHIGH-PASS = 2πRC

THERMOCOUPLE

+VS

REF

–VS

10MΩ

AD8222

TRANSFORMER

+VS

REF

–VS

AD8222

CORRECT

Figure 47. Creating an IBIAS Path

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