Datasheet

Data Sheet ADR512
Rev. A | Page 7 of 12
PARAMETER DEFINITIONS
TEMPERATURE COEFFICIENT
This 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:
( ) ( )
( ) ( )
6
12
12
10
25
×
−×°
−
=






° TTCV
TVTV
C
ppm
TCV
O
OO
O
(1)
where:
V
O
(25°C) = V
O
at 25°C
V
O
(T
1
) = V
O
at Temperature 1
V
O
(T
2
) = V
O
at Temperature 2
THERMAL HYSTERESIS
Thermal hysteresis is defined as the change of output voltage
after the device is cycled through the temperature 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.
[ ]
( )
( )
6
_
_
__
10
25
25
)25(
×
°
−°
=
−°=
CV
VCV
ppmV
VCVV
O
TCOO
HYSO
TCOOHYSO
(2)
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