ADR127 Analog Devices, Inc., ADR127 Datasheet - Page 15

• Manufacturer Part Number: ADR127
• Description: Precision, Micropower Ldo Voltage References In Tsot
• Manufacturer: Analog Devices, Inc.

TERMINOLOGY
Temperature Coefficient
The change of output voltage with respect to operating
temperature change normalized by the output voltage at 25°C.
This parameter is expressed in ppm/°C and can be determined
as follows:
where:
V
V
V
Line Regulation
The change in the output due to a specified change in input
voltage. This parameter accounts for the effects of self-heating.
Line regulation is expressed in either percent per volt, parts-
per-million per volt, or microvolts per voltage changes in input
voltage.
Load Regulation
The change in output voltage due to a specified change in load
current. This parameter accounts for the effects of self-heating.
Load regulation is expressed in either microvolts per milliam-
pere, parts-per-million per milliampere, or ohms of dc output
resistance.
OUT
OUT
OUT
(25°C) = V
(T
(T
TCV
1
2
) = V
) = V
OUT
[
OUT
OUT
ppm/
OUT
at Temperature 1.
at Temperature 2.
°
at 25°C.
C
]
=
V
OUT
V
O
UT
(
25
( )
T
°
2
C
−
) (
×
V
OUT
T
2
( )
−
T
1
T
1
)
×
10
6
Rev. A | Page 15 of 20
Long-Term Stability
Typical shift of output voltage at 25°C on a sample of parts
subjected to a test of 1000 hours at 25°C.
where:
V
V
Thermal Hysteresis
The change of output voltage after the device is cycled through
temperatures from +25°C to −40°C to +125°C and back to
+25°C. This is a typical value from a sample of parts put
through such a cycle.
where:
V
V
−40°C to +125°C and back to +25°C.
OUT
OUT
OUT
OUT_TC
(t
(t
(25°C) = V
V
V
Δ
Δ
0
1
OUT
OUT
V
V
) = V
) = V
= V
O
OUT
UT
_
_
HYS
HYS
[
OUT
V
ppm
OUT
OUT
OUT
[
ppm
=
at 25°C after temperature cycle at +25°C to
OUT
at 25°C at Time 0.
at 25°C after 1000 hours operating at 25°C.
( )
V
]
t
=
0
OUT
]
at 25°C.
V
=
−
OUT
(
V
V
25
O
O
ADR121/ADR125/ADR127
UT
( )
UT
V
°
t
C
0
OUT
( )
(
V
t
)
25
1
−
−
OUT
( )
V
°
t
V
0
C
OUT
OUT
(
25
)
−
( )
_
°
t
V
1
TC
C
OUT
)
×
10
_
TC
6
×
10
6