OP90 Datasheet, PDF (7/12 Pages) Analog Devices – Precision Low-Voltage Micropower Operational Amplifier

120
T_A = 25؇C
100
NEGATIVE SUPPLY
80
POSITIVE SUPPLY
60
40
20
1
10
100
1k
FREQUENCY – Hz
TPC 10. Power Supply Rejection
vs. Frequency
140
V_S = ؎15V
T_A = 25؇C
120
100
80
60
40
1
10
100
1k
FREQUENCY – Hz
TPC 11. Common-Mode Rejection
vs. Frequency
100
V_S = ؎15V
T_A = 25؇C
10
OP90
1000
V_S = ؎15V
T_A = 25؇C
100
10
1
0.1
1
10
100
1k
FREQUENCY – Hz
TPC 12. Noise Voltage Density
vs. Frequency
1
0.1
0.1
1
10
100
1k
FREQUENCY – Hz
TPC 13. Current Noise Density
vs. Frequency
T_A = 25؇C
V_S = ؎15V
A_V = +1
R_L = 10k⍀
C_L = 500pF
TPC 14. Small-Signal Transient
Response
T_A = 25؇C
V_S = ؎15V
A_V = +1
R_L = 10k⍀
C_L = 500pF
TPC 15. Large-Signal Transient
Response
+18V
2
7
6
OP90
3
4
–18V
Figure 2. Burn-In Circuit
APPLICATION INFORMATION
Battery-Powered Applications
The OP90 can be operated on a minimum supply voltage of 1.6 V,
or with dual supplies ± 0.8 V, and draws only 14 pA of supply
current. In many battery-powered circuits, the OP90 can be
continuously operated for thousands of hours before requiring
battery replacement, reducing equipment down time and
operating cost.
High-performance portable equipment and instruments frequently
use lithium cells because of their long shelf-life, light weight, and
high-energy density relative to older primary cells. Most lithium
cells have a nominal output voltage of 3 V and are noted for a
flat discharge characteristic. The low-supply voltage requirement
of the OP90, combined with the flat discharge characteristic of
the lithium cell, indicates that the OP90 can be operated over
the entire useful life of the cell. Figure 1 shows the typical dis-
charge characteristic of a 1Ah lithium cell powering an OP90
which, in turn, is driving full output swing into a 100 kΩ load.
REV. A
–7–