0

10

20

30

40

50

-80

-60

-40

-20

0

20

40

60

Thermal hysteresis - Cycle 1 (ppm)

C030

0

10

20

30

40

50

-20

-15

-10

-5

0

5

15

20

Thermal hysteresis - Cycle 2 (ppm)

C031

PRE

POST

6

HYST

NOM

V

V

V

10

(ppm)

V

§

·

x

¨

¸

¨

¸

©

¹

15

REF6025, REF6030, REF6033, REF6041, REF6045, REF6050

www.ti.com

SBOS708B – MAY 2016 – REVISED AUGUST 2016

Product Folder Links: REF6025 REF6030 REF6033 REF6041 REF6045 REF6050

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Copyright © 2016, Texas Instruments Incorporated

8.2 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 REF60xx 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

•

VHYST = thermal hysteresis (in units of ppm).

•

VNOM = the specified output voltage.

•

VPRE = output voltage measured at 25°C pretemperature cycling.

•

VPOST = output voltage measured after the device has cycled from 25°C through the specified temperature

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

(1)

Typical thermal hysteresis distribution is shown in Figure 42 and Figure 43.

Figure 42. Thermal Hysteresis Distribution (Cycle 1)

Figure 43. Thermal Hysteresis Distribution (Cycle 2)