AD1582/AD1583/AD1584/AD1585 Data Sheet
Rev. J | Page 8 of 16
TERMINOLOGY
Temperature Coefficient (TCV
O
)
The change of output voltage over the operating temperature
change and normalized by the output voltage at 25°C, expressed
in ppm/°C. The equation follows
[ ]
( )
(
)
( )
(
)
6
10
25
C
ppm/
×
−
×°
−
=
°
1
2
O
1
O
2
O
O
T
TC
V
T
V
T
V
TCV
where:
V
O
(25°C) = V
O
@ 25°C.
V
O
(T
1
) = V
O
@ Temperature 1.
V
O
(T
2
) = V
O
@ Temperature 2.
Line Regulation (ΔV
O
/ΔV
IN
) Definition
The change in output voltage due to a specified change in input
voltage. It includes 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 (ΔV
O
/ΔI
LOAD
)
The change in output voltage due to a specified change in load
current. It includes 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.
Long-Term Stability (ΔV
O
)
Typical shift of output voltage at 25°C on a sample of parts
subjected to an operation life test of 1000 hours at 125°C.
( )
( )
1
O
0
OO
tVtVV −=∆
[ ]
(
)
( )
( )
6
10ppm ×
−
=∆
0
O
1
O
0
O
O
tV
t
VtV
V
where:
V
O
(t
0
) = V
O
@25°C at Time 0.
V
O
(t
1
) = V
O
@ 25°C after 1000 hours of operation at 125°C.
Thermal Hysteresis (V
O_HYS
)
The change of output voltage after the device is cycled through
temperatures from +25°C to −40°C to +85°C and back to +25°C.
This is a typical value from a sample of parts put through
such a cycle
(
)
TCO
OHYSO
VCVV
_
_
25 −°=
[ ]
( )
( )
6
_
_
10
25
25
ppm ×
°
−°
=
CV
VCV
V
O
TCO
O
HYSO
where:
V
O
(25°C) = V
O
at 25°C.
V
O_TC
= V
O
at 25°C after temperature cycle at +25°C to −40°C to
+85°C and back to +25°C.
Operating Temperature
The temperature extremes at which the device can still function.
Parts can deviate from their specified performance outside the
specified temperature range.
