AD625
40
+V
30
S
20
10
V
OUT
0
AD625
10V
–10
–20
–30
–V
S
–40
–125
–75
–25
25
75
125
TEMPERATURE – ꢁC
Figure 12. Gain Overrange Recovery
Figure 10. Input Bias Current vs.
Temperature
Figure 11. Overrange and Gain
Switching Test Circuit (G = 8, G = 1)
100k
10k
1k
8.0
6.0
4.0
2.0
0
1000
100
10
1
G = 1
G = 10
G = 100, 1000
100
10
G = 1000
10k
0.1
1
10
100
1k
10k
100k
1
10
100
1k
100k
0
5
10
15
20
FREQUENCY – Hz
FREQUENCY – Hz
SUPPLY VOLTAGE – ꢃV
Figure 15. Input Current Noise
Figure 13. Quiescent Current vs.
Supply Voltage
Figure 14. RTI Noise Spectral
Density vs. Gain
+V
S
–V
S
AD625
DUT
16.2kꢀ
1ꢂF
+V
S
1ꢂF
AD712
1/2
1/2
AD712
9.09kꢀ
16.2kꢀ
1ꢂF
–V
S
G = 1, 10, 100
G = 1000
1.62Mꢀ
100ꢀ
1kꢀ
1.82kꢀ
Figure 18. Low Frequency Voltage
Noise, G = 1000 (System
Gain = 100,000)
Figure 16. Low Frequency Voltage
Noise, G = 1 (System Gain = 1000)
Figure 17. Noise Test Circuit
–6–
REV. D
ADI [ ADI ]
