Data Sheet
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 50. It is measured
by sweeping the temperature from ambient to −40°C, next to
+105°C, and then returning to ambient. The VREF delta is then
measured between the two ambient measurements and shown
in blue in Figure 50. The same temperature sweep and measure-
ments are immediately repeated and the results are shown in
red in Figure 50.
AD5689R/AD5687R
9
FIRST TEMPERATURE SWEEP
8 SUBSEQUENT TEMPERATURE SWEEPS
7
6
5
4
3
2
1
0
–200
–150
–100
–50
0
50
DISTORTION (ppm)
Figure 50. Thermal Hysteresis
Rev. B | Page 25 of 28