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 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:

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 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.

Typical thermal hysteresis distribution is shown in Figure 7-3 and Figure 7-4.

0

10

20

30

40

50

-80

-60

-40

-20

0

20

40

60

Thermal hysteresis - Cycle 1 (ppm)

C030

Figure 7-3. Thermal Hysteresis Distribution (Cycle

1)

0

10

20

30

40

50

-20

-15

-10

-5

0

5

15

20

Thermal hysteresis - Cycle 2 (ppm)

C031

Figure 7-4. Thermal Hysteresis Distribution (Cycle

2)

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SBOS708C – MAY 2016 – REVISED APRIL 2026

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