0

5

10

15

20

25

30

35

40

Thermal Hysterisis - V

REF (ppm)

C013

0

5

10

15

20

25

30

35

40

Thermal Hysteresis - V

BIAS (ppm)

C014

PRE

POST

6

HYST

NOM

V

V

V

10

(ppm)

V

§

·

x

¨

¸

¨

¸

©

¹

13

REF1925, REF1930, REF1933, REF1941

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SBOS697A – SEPTEMBER 2014 – REVISED JANUARY 2017

Product Folder Links: REF1925 REF1930 REF1933 REF1941

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8.2 Thermal Hysteresis

Thermal hysteresis is measured with the REF19xx 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:

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.

(1)

Typical thermal hysteresis distribution is as shown in Figure 39 and Figure 40.

Figure 39. Thermal Hysteresis Distribution (VREF)

Figure 40. Thermal Hysteresis Distribution (VBIAS)