–7–

OP90

+18V

–18V

2

3

4

6

7

OP90

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 k

Ω load.

FREQUENCY – Hz

120

100

20

11k

10

100

60

80

40

POSITIVE SUPPLY

NEGATIVE SUPPLY

TPC 10. Power Supply Rejection

vs. Frequency

FREQUENCY – Hz

100

0.1

0.1

1k

110

10

1

100

TPC 13. Current Noise Density

vs. Frequency

FREQUENCY – Hz

140

120

40

11k

10

100

80

100

60

TPC 11. Common-Mode Rejection

vs. Frequency

TPC 14. Small-Signal Transient

Response

FREQUENCY – Hz

1000

1

0.1

1k

110

100

10

100

TPC 12. Noise Voltage Density

vs. Frequency

TPC 15. Large-Signal Transient

Response

REV. C