ADR121 Analog Devices, Inc., ADR121 Datasheet - Page 7

• Manufacturer Part Number: ADR121
• 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
by
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.
O
O
O
(25°C) = V
(T
(T
1
2
TCV
) = V
) = V
O
O
O
>
at Temperature 1.
at Temperature 2.
ppm/
O
at 25°C.
q
C
@
V
O
V
O
25
T
q
2
C

u
V
T
O
2
T

1
T
1
u
10
6
Rev. 0 | Page 7 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
+125°C and back to +25°C.
O
O
O
OTC
(t
(t
(25°C) = V
0
1
) = V
) = V
= V
'
'
V
V
O
O
O
O
O
at 25°C after temperature cycle at +25°C to −40°C to
>
ppm
at 25°C at Time 0.
at 25°C after 1000 hours operating at 25°C.
V
O
O
at 25°C.
t
@
O
V

O
V
t
O
V
O
ADR121/ADR125/ADR127
O
t
1

t
O
V
O
t
1
u
10
6