ADR5040/ADR5041/ADR5043/ADR5044/ADR5045

Data Sheet

Rev. B | Page 10 of 16

TERMINOLOGY

Temperature Coefficient

The change in output voltage with respect to operating temperature

changes. It is normalized by an output voltage of 25°C. This

parameter is expressed in ppm/°C and is determined by the

following equation:

( )

( )

(

)

(

)

6

10

C

25

C

ppm

×

−

×

°

−

=









°

1

2

UT

O

1

OUT

2

OUT

OUT

T

T

V

T

V

T

V

TCV

(1)

where:

Thermal Hysteresis

The change in output voltage after the device is cycled through

temperatures ranging from +25°C to −40°C, then to +125°C, and

back to +25°C. This is common in precision reference and is

caused by thermal-mechanical package stress. Changes in envi-

ronmental storage temperature, board mounting temperature, and

the operating temperature are some of the factors that can

contribute to thermal hysteresis. The following equation

expresses a typical value from a sample of parts put through

such a cycle:

(

)

[

]

(

)

(

)

6

]

]

]

]

10

C

25

C

25

ppm

C

25

×

°

−

°

=

−

°

=

OUT

TC

OUT

OUT

HYS

OUT

TC

OUT

OUT

HYS

OUT

V

V

V

V

V

V

V

(2)

where:

−40°C, then to +125°C, and back to +25°C.