AD8422 Data Sheet
–20
–16
–12
–8
–4
0
4
8
12
16
20
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
–35 –30 –25 –20 –15 –10 –5
0 5 10 15 20 25 30 35 40
INPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
V
S
= 5V
G = 100
V
REF
= 2.5V
V
IN–
= 2.5V
V
OUT
I
IN
11197-017
Figure 16. Input Overvoltage Performance; G = 100, V
S
= 5 V
–20
20
–15
–10
–5
0
5
10
15
–20
20
–15
–10
–5
0
5
10
15
–20
–25 –15 –10
–5
0 5
10 15 20
25
INPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
V
S
= ±15
V
G = 100
V
RE
F
= 0V
V
IN–
= 0V
V
O
UT
I
IN
11197-018
Figure 17. Input Overvoltage Performance; G = 100, V
S
= ±15 V
–0.25
–0.20
–0.15
–0.10
–0.05
0
0.05
0.10
0.15
0.20
0.25
–15
–10
–5
0 5
10 15
INPUT BI AS CURRE NT (n A)
COMMON-MODE VOLTAGE (V)
11197-019
V
S
= ±15V
Figure 18. Input Bias Current vs. Common-Mode Voltage, V
S
= ±15 V
–0.20
–0.15
–0.10
–0.05
0
0.05
0.10
0.15
0.20
INPUT BI AS CURRE NT (n A)
COMMON-MODE VO
LT
AGE (V)
11197-020
V
S
=
5V
1.0 1.5 2.0 2.5 3.0 3.5 4.0
Figure 19. Input Bias Current vs. Common-Mode Voltage, V
S
= 5 V
0
20
40
60
80
100
120
140
160
180
0.1 1 10 100 1k 10k 100k
POSITI VE PSRR (dB)
FREQUENCY (Hz)
GAIN = 1
GAIN = 10
GAIN = 100
GAIN = 1000
11197-021
Figure 20. Positive PSRR vs. Frequency
0
20
40
60
80
100
120
140
160
180
0.1 1 10 100 1k 10k 100k
NEGAT I VE PSRR (dB)
FREQUENCY (Hz)
GAIN = 1
GAIN = 10
GAIN = 100
GAIN = 1000
11197-022
Figure 21. Negative PSRR vs. Frequency
Rev. A | Page 12 of 24
