Datasheet

Data Sheet AD5689R/AD5687R
Rev. 0 | Page 25 of 28
THERMAL HYSTERESIS
Thermal hysteresis is the voltage difference induced on the refer-
ence voltage by sweeping the temperature from ambient to cold,
to hot, and then back to ambient.
Thermal hysteresis data is shown in Figure 51. It is measured
by sweeping the temperature from ambient to −40°C, next to
+105°C, and then returning to ambient. The V
REF
delta is then
measured between the two ambient measurements and shown
in blue in Figure 51. The same temperature sweep and measure-
ments are immediately repeated and the results are shown in
red in Figure 51.
Figure 51. Thermal Hysteresis
9
8
7
6
5
4
3
2
1
0
500–50–100–150–200
HITS
DISTORTION (ppm)
FIRST TEMPERATURE SWEEP
SUBSEQUENT TEMPERATURE SWEEPS
11256-052