ADR391A AD [Analog Devices], ADR391A Datasheet - Page 13

• Manufacturer Part Number: ADR391A
• Description: Micropower, Low Noise Precision Voltage References with Shutdown
• Manufacturer: AD [Analog Devices]

TERMINOLOGY
Temperature Coefficient
The change of output voltage with respect to operating temperature
changes 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 output voltage 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 volt change 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 milliampere,
parts-per-million per milliampere, or ohms of dc output resistance.
O
O
O
(25°C) is V
( T
( T
TCV
1
2
) is V
) is V
O
[
O
O
ppm/
at Temperature 1.
at Temperature 2.
O
at 25°C.
°
C
]
=
V
O
(
V
25
O
°
( )
T
C
2
)
×
–
V
(
T
O
2
( )
T
–
1
T
1
)
×
10
6
Rev. H | Page 13 of 20
(1)
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
Thermally Induced Output Voltage Hysteresis
The change of output voltage after the device cycles through
the 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.
O
O
O
O_TC
( t
( t
(25°C) is V
Δ V
V
0
1
V
Δ
) is V
) is V
is V
O_HYS
O
V
O
_
O
HYS
[
= V
O
ppm
O
O
= V
at 25°C after a temperature cycle from +25°C to
[
at 25°C at Time 0.
at 25°C after 1000 hours operation at 25°C.
ppm
O
( t
O
]
O
0
at 25°C.
(25°C) − V
=
) − V
]
⎛
⎜
⎜
⎝
=
V
V
O
O
(
O
( t
t
V
0
(
ADR391/ADR392/ADR395
1
25
)
)
O
V
−
(
O
O_TC
t
o
V
0
C
(
25
)
O
)
(
−
o
t
1
C
V
)
)
O
×
_
10
TC
6
×
⎞
⎟
⎟
⎠
10
6
(2)
(3)
(4)