Output Pin

Meter

V

OUT

+

-

Sense Line

Force Line

Load

I

L

Contact and

Trace Resistance

20

0

-20

-40

-60

-80

-100

-120

0

100

200

300 400

500

600

700

800 900 1000

Time (Hrs)

12

REF3112, REF3120, REF3125

REF3130, REF3133, REF3140

SBVS046D – DECEMBER 2003 – REVISED MARCH 2016

www.ti.com

Product Folder Links: REF3112 REF3120 REF3125 REF3130 REF3133 REF3140

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Copyright © 2003–2016, Texas Instruments Incorporated

Feature Description (continued)

8.3.5 Long-Term Stability

Long-term stability refers to the change of the output voltage of a reference over a period of months or years.

This effect lessens as time progresses, as is shown by the long-term stability curves. The typical drift value for

the REF31xx is 70 ppm from 0 to 1000 hours. This parameter is characterized by measuring 30 units at regular

intervals for a period of 1000 hours.

Figure 22. REF3112 Long-Term Stability

8.3.6 Load Regulation

Load regulation is defined as the change in output voltage due to changes in load current. The load regulation of

the REF31xx is measured using force and sense contacts as pictured in Figure 23. The force and sense lines

reduce the impact of contact and trace resistance, resulting in accurate measurement of the load regulation

contributed solely by the REF31xx. For applications requiring improved load regulation, force and sense lines

must be used.

Figure 23. Accurate Load Regulation of REF31xx