0

10

20

30

40

50

60

70

-40

-35

-30

-25

-20

-15

-10

-5

0

5

Thermal hysteresis - Cycle 1 (ppm)

C028

0

10

20

30

40

50

-10

-8

-6

-4

-2

0

2

4

6

8

10

Thermal hysteresis - Cycle 2 (ppm)

C027

PRE

POST

6

HYST

NOM

V

V

V

10

(ppm)

V

§

·

x

¨

¸

¨

¸

©

¹

15

REF6225, REF6230, REF6233, REF6241, REF6245, REF6250

www.ti.com

SBOS748 – SEPTEMBER 2016

Product Folder Links: REF6225 REF6230 REF6233 REF6241 REF6245 REF6250

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Copyright © 2016, Texas Instruments Incorporated

7.2 Thermal Hysteresis

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. Thermal hysteresis was

measured with the REF62xx soldered to a PCB, similar to a real-world application. The PCB was baked at 150°C

for 30 minutes before thermal hysteresis was measured. Thermal hysteresis is expressed as:

where

•

•

•

•

range of 0°C to 70°C and returns to 25°C.

(1)

Typical thermal hysteresis distribution is shown in Figure 41 and Figure 42.

Figure 41. Thermal Hysteresis Distribution (Cycle 1)

Figure 42. Thermal Hysteresis Distribution (Cycle 2)