ADR5040/ADR5041/ADR5043/ADR5044/ADR5045
TERMINOLOGY
Data Sheet
Thermal Hysteresis
Temperature Coefficient
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:
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:
VOUT
(
T2
25°C
)
−VOUT
(
T1
)
ppm
°C
TCVOUT
=
×106
(1)
VO
(
)
×
(
T2 −T1
)
UT
where:
V
V
V
OUT(25°C) = VOUT at 25°C.
OUT(T1) = VOUT at Temperature 1.
OUT(T2) = VOUT at Temperature 2.
VOUT ] HYS = VOUT
(
25°C
)
−VOUT ]TC
VOUT
(
25°C −VOUT ]TC
)
(2)
VOUT ] HYS
[
ppm
]
=
×106
VOUT 25°C
( )
where:
V
V
OUT(25°C) = VOUT at 25°C.
OUT_TC = VOUT at 25°C after a temperature cycle from +25°C to
−40°C, then to +125°C, and back to +25°C.
Rev. B | Page 10 of 16
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