ADR550_15 Datasheet, PDF (7/16 Pages) Analog Devices – High Precision Shunt Mode Voltage References

ADR520/ADR525/ADR530/ADR540/ADR550
PARAMETER DEFINITIONS
TEMPERATURE COEFFICIENT
Temperature coefficient is defined as the change in output
voltage with respect to operating temperature changes and is
normalized by the output voltage at 25°C. This parameter is
expressed in ppm/°C and is determined by the following
equation:
TCV_O
⎡
⎢⎣
ppm
°C
⎤
⎥⎦
=
V_OUT (T₂ ) −
V_OUT (25° C)
V_OUT
× (T₂
(T₁ )
− T₁
)
×
10
6
(1)
where:
VOUT(T2) = VOUT at Temperature 2.
VOUT(T1) = VOUT at Temperature 1.
VOUT(25°C) = VOUT at 25°C.
THERMAL HYSTERESIS
Thermal hysteresis is defined as the change in output voltage
after the device is cycled through temperatures ranging from
+25°C to −40°C, then to +85°C, and back to +25°C. The
following equation expresses a typical value from a sample of
parts put through such a cycle:
V_{OUT _ HYS} = V_OUT (25° C) − V_{OUT _ END}
V_OUT
_
HYS ^[ppm]
=
V_OUT
(25° C) − V_OUT
V_OUT (25° C)
_
END
× 10⁶
(2)
where:
VOUT(25°C) = VOUT at 25°C.
VOUT_END = VOUT at 25°C after a temperature cycle from +25°C to
−40°C, then to +85°C, and back to +25°C.
Rev. E | Page 7 of 16