ADR318 Analog Devices, Inc., ADR318 Datasheet - Page 8

• Manufacturer Part Number: ADR318
• Description: Precision Low Drift Sot-23 Voltage Reference With Shutdown
• Manufacturer: Analog Devices, Inc.

ADR318
TERMINOLOGY
Temperature Coefficient
Temperature coefficient is 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 with the following equation:
where:
V
V
V
Long-Term Stability
Long-term stability is the typical shift of output voltage at 25°C
on a sample of parts subjected to a test of 1000 hours at 25°C.
O
O
O
(25°C) = V
(T
(T
Δ V
TCV
1
2
Δ
) = V
) = V
V
O
O
= V
[
O
ppm
O
O
⎡
⎢ ⎣
at Temperature 1.
at Temperature 2.
ppm
O
O
°
(t
C
]
at 25°C.
0
=
) − V
⎤
⎥ ⎦
V
=
O
V
( )
O
t
(t
V
0
O
V
O
1
(
O
)
25
−
( )
t
( )
0
T
V
°
2
C
O
( )
)
t
−
1
×
V
(
×
T
O
10
2
( )
T
−
6
1
T
1
)
×
10
6
Rev. A | Page 8 of 12
(1)
(2)
where:
V
V
Thermal Hysteresis
Thermal hysteresis is the change of output voltage after the
device is cycled through temperature 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
O_TC
(t
(t
(25°C) = V
0
1
V
) = V
) = V
V
= V
O_HYS
O
_
HYS
O
O
O
at 25°C after temperature cycle at +25°C to −40°C to
= V
at 25°C at Time 0.
at 25°C after 1000 hours of operation at 25°C.
[
ppm
O
O
at 25°C.
(25°C) − V
]
=
V
O
(
25
V
O_TC
O
°
C
(
25
)
−
°
C
V
)
O
_
TC
×
10
6
(3)