5

NOTES

1. Maximum errors over all ranges are guaranteed based on

the known behavior characteristic of the AD590.

assumed that the device is trimmed at the midpoint.

other spans, the specified trims are at the endpoints.

4. In precision applications, the actual errors encountered

are usually dependent upon sources of error which are

often overlooked in error budgets. These typically

include:

a. Trim error in the calibration technique used

b. Repeatability error

c. Long term drift errors

Trim Error is usually the largest error source. This error

arises from such causes as poor thermal coupling between

the device to be calibrated and the reference sensor; refer-

ence sensor errors; lack of adequate time for the device

being calibrated to settle to the final temperature; radically

different thermal resistances between the case and the sur-

device.

Repeatability Errors arise from a strain hysteresis of the

package. The magnitude of this error is solely a function of

the magnitude of the temperature span over which the

repeatability errors of less than

will typIcally exhibit a repeatability error of

guaranteed maximum).

Long Term Drift Errors are related to the average operat-

ing temperature and the magnitude of the thermal-shocks

experienced by the device. Extended use of the AD590 at

of

per month. Continuous operation at temperatures below

the effects of operating temperature, the severity of thermal

shocks incurred will also affect absolute stability. For

the device may drift by as much as

such shocks. If severe, quick shocks are necessary in the

application of the device, realistic simulated life tests are rec-

ommended for a thorough evaluation of the error introduced

NUMBER OF

TRIMS

TEMPERATURE

LOWEST TEMPERATURE IN SPAN (×oC)

-55

-25

0

255075

100

125

None

10

4.2

4.6

5.0

5.4

5.8

6.2

6.6

7.2

None

25

5.0

5.2

5.5

5.9

6.0

6.9

7.5

8.0

None

50

6.5

6.5

6.4

6.9

7.3

8.2

9.0

-

None

100

7.7

8.0

8.3

8.7

9.4

-

-

-

None

150

9.2

9.5

9.6

-----

None

205

10.0

-------

One

10

0.3

0.2

0.2

0.2

0.2

0.2

0.2

0.3

One

25

0.9

0.6

0.5

0.5

0.5

0.6

0.8

0.9

One

50

1.9

1.5

1.0

1.0

1.0

1.5

1.9

-

One

100

2.3

2.2

2.0

2.0

2.3

-

-

-

One

150

2.5

2.4

2.5

-----

One

205

3.0

-------

Two

10

0.1

(Note 10)

(Note 10)

(Note 10)

(Note 10)

(Note 10)

(Note 10)

0.1

Two

25

0.2

0.1

(Note 10)

(Note 10)

(Note 10)

(Note 10)

0.1

0.2

Two

50

0.4

0.2

0.1

(Note 10)

(Note 10)

0.1

0.2

(Note 10)

Two

100

0.7

0.5

0.3

0.7

1.0

-

-

-

Two

150

1.0

0.7

1.2

-----

Two

205

1.6

-------

NOTE:

10. Less than

AD590