Datasheet

ADR293
Rev. D | Page 9 of 12
TERMINOLOGY
Line Regulation
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 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. It includes the effects of self-heating. Load regulation is
expressed in microvolts per milliampere, parts per million per
milliampere, or ohms of dc output resistance.
Long-Term Stability
Typical shift of output voltage of 25°C on a sample of parts
subjected to high temperature operating life test of 1000 hours
at 125°C.
(
)
()
1
OUT
0
OUTOUT
tVtVV −=Δ
[]
() ()
()
6
10ppm ×
−
=Δ
0
OUT
1
OUT
0
OUT
OUT
tV
tVtV
V
where:
V
OUT
(t
0
) = V
OUT
at 25°C at time 0.
V
OUT
(t
1
) = V
OUT
at 25°C after 1000 hours operation at 125°C.
NC = No Connect
There are in fact connections at NC pins, which are reserved for
manufacturing purposes. Users should not connect anything at
NC pins.
Temperature Coefficient
The change of output voltage over the operating temperature
change and normalized by the output voltage at 25°C, expressed
in ppm/°C.
[]
()
(
)
() ()
6
10Cppm/ ×
−×°
−
=°
12
OUT
1
OUT
2
OUT
OUT
TTC25V
TVΤV
VTC
where:
V
OUT
(25°C) = V
OUT
at 25°C.
V
OUT
(T
1
) = V
OUT
at Temperature 1.
V
OUT
(T
2
) = V
OUT
at Temperature 2.
Thermal Hysteresis
Thermal hysteresis is defined as 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.
(
)
TCOUTOUTHYSOUT
VC25VV
−−
−°
=
[]
()
()
6
10ppm ×
°
−°
=
−
−
C25V
VC25V
V
OUT
TCOUTOUT
HYSOUT
where:
V
OUT
(25°C) = V
OUT
at 25°C.
V
OUT-TC
= V
OUT
(25°C) after temperature cycle at +25°C to –40°C
to +85°C and back to +25°C.