AD8222
200
150
INPUT BIAS CURRENT (pA)
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0.1
BANDWIDTH
LIMITED
GAIN = 1000
100
50
0
V
S
= ±15V
+PSRR (dB)
V
S
= ±5V
–50
–100
–150
–200
–15
GAIN = 100
GAIN = 10
GAIN = 1
05947-009
–10
–5
0
5
10
15
1
10
100
1k
10k
100k
1M
COMMON-MODE VOLTAGE (V)
FREQUENCY (Hz)
Figure 9. I
BIAS
vs. Common-Mode Voltage
2.0
CHANGE IN INPUT OFFSET VOLTAGE (µV)
Figure 12. Positive PSRR vs. Frequency, RTI (G = 1 to 1000)
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0.1
–PSRR (dB)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
05947-010
GAIN = 1000
GAIN = 100
GAIN = 10
GAIN = 1
1
10
100
1k
10k
100k
1M
05947-013
05947-014
0
0
2
4
6
8
10
WARM-UP TIME (Minutes)
FREQUENCY (Hz)
Figure 10. Change in Input Offset Voltage vs. Warm-Up Time
1000
800
600
INPUT BIAS CURRENT (pA)
Figure 13. Negative PSRR vs. Frequency, RTI (G = 1 to 1000)
10k
NEGATIVE
TOTAL DRIFT: 25°C TO 85°C RTI (µV)
1k
GAIN = 1
100
GAIN = 10
GAIN = 100
400
200
0
–200
–400
–600
–800
05947-011
POSITIVE
OFFSET CURRENT
10
GAIN = 1000
–1000
–55
–35
–15
5
25
45
65
85
105
125
1
1
10
100
1k
10k
100k
1M
10M
TEMPERATURE (°C)
SOURCE RESISTANCE (Ω)
Figure 11. Input Bias Current and Offset Current vs. Temperature
Figure 14. Total Drift vs. Source Resistance
Rev. A | Page 9 of 24
05947-012
AD [ ANALOG DEVICES ]
