9.2 Long-Term Stability

One of the key parameters of the REF34-Q1 references is long-term stability. Typical characteristic expressed

as: curves shows the typical drift value for the REF34-Q1 is 25 ppm from 0 to 1000 hours. This parameter is

characterized by measuring 32 units at regular intervals for a period of 1000 hours. It is important to understand

that long-term stability is not ensured by design and that the output from the device may shift beyond the typical

25 ppm specification at any time. For systems that require highly stable output voltages over long periods of

time, the designer should consider burning in the devices prior to use to minimize the amount of output drift

exhibited by the reference over time

Hours

0

100

200

300

400

500

600

700

800

900 1000

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

D022

- DBV Package

Hours

0

100

200

300

400

500

600

700

800

900 1000

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

DGKl

DGKl

- DGK Package

9.3 Thermal Hysteresis

Thermal hysteresis is measured with the REF34-Q1 soldered to a PCB, similar to a real-world application.

Thermal hysteresis for the device is defined as the change in output voltage after operating the device at 25°C,

cycling the device through the specified temperature range, and returning to 25°C. Hysteresis can be expressed

by Equation 1:

6

PRE

POST

HYST

NOM

| V

V

|

V

10

ppm

V

§

·

u

¨

¸

©

¹

(1)

where

range of –40°C to +125°C and returns to 25°C.

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REF34-Q1

SBAS901C – JULY 2018 – REVISED OCTOBER 2020

Copyright © 2020 Texas Instruments Incorporated

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Product Folder Links: REF34-Q1