Data Sheet AD8422
–20
–10
0
10
20
30
40
50
60
70
10 100 1k
10k
100k 1M
10M
GAI N (dB)
FREQUENC
Y
(Hz)
G
AI
N =
1
GA
I
N = 10
GAIN = 100
G
A
IN
=
1000
11197-023
Figure 22. Gain vs. Frequency
40
60
80
100
120
140
160
180
CMRR (dB)
FREQUENCY
(Hz)
G
A
I
N
= 1
G
AI
N =
10
G
A
I
N
=
10
0
G
A
IN
=
100
0
11197-024
0.1 1
10 100
1k
10k 100k
Figure 23. CMRR vs. Frequency
40
60
80
100
120
140
160
180
CMRR (dB)
FREQUENCY (Hz)
GAIN = 1
GAIN = 10
GAIN = 100
GAIN = 1000
11197-025
0.1 1 10 100 1k 10k 100k
Figure 24. CMRR vs. Frequency, 1 kΩ Source Imbalance
–0.5
–0.4
–0.3
–0.2
–0.1
0
0.1
0.2
0.3
0.4
0.5
0 10 20 30 40 50 60 70 80 90 100
CHANGE IN INPUT OFFSET VOLTAGE (µV)
TIME (s)
11197-026
Figure 25. Change in Input Offset Voltage (V
OSI
) vs. Warm-Up Time
–0.4
–0.3
–0.2
–0.1
0
0.1
0.2
0.3
0.4
–2.0
–1.5
–1.0
–0.5
0
0.5
1.0
1.5
2.0
–
40
–
25
–
10
5
20 35 50 65
80 95 1
10
125
INPUT O FF SE T CURRENT (n A)
INPUT BI AS CURRE NT (n A)
TEMPER
ATURE ( °C)
V
S
= ±15V
NORMALIZED
AT 25° C
11197-027
Figure 26. Input Bias Current and Input Offset Current vs. Temperature
–100
–80
–60
–40
–20
0
20
40
60
80
100
–40 –25 –10
5
20 35 50 65 80 95 110
125
GAI N E RROR (µV/ V )
TEMPERA
TURE ( °C)
REPRESENTATIVE S
AM
PL
E
S
NO
R
MA
LIZ
E
D A
T
25°C
11197-028
Figure 27. Gain vs. Temperature (G = 1)
Rev. A | Page 13 of 24
