8.3 Thermal Hysteresis

Thermal hysteresis is measured with the REF20xx 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:

PRE

POST

6

HYST

NOM

V

V

V

10

(ppm)

V

§

·

x

¨

¸

¨

¸

©

¹

(1)

where

• VHYST = thermal hysteresis (in units of ppm),

• VNOM = the specified output voltage,

• VPRE = output voltage measured at 25°C pre-temperature cycling, and

• 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.

Typical thermal hysteresis distribution is as shown in Figure 8-5 and Figure 8-6.

0

5

10

15

20

25

30

35

40

Thermal Hysterisis - VREF (ppm)

C013

Figure 8-5. Thermal Hysteresis Distribution (VREF)

0

5

10

15

20

25

30

35

40

Thermal Hysteresis - VBIAS (ppm)

C014

Figure 8-6. Thermal Hysteresis Distribution (VBIAS)

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REF2025, REF2030, REF2033, REF2041

SBOS600E – JULY 2018 – REVISED FEBRUARY 2022

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