Datasheet

AD5696R/AD5695R/AD5694R Data Sheet
Rev. B | Page 26 of 32
THERMAL HYSTERESIS
Thermal hysteresis is the voltage difference induced on the
reference voltage by sweeping the temperature from ambient
to cold, to hot and then back to ambient.
Thermal hysteresis data is shown in Figure 57. It is measured by
sweeping temperature from ambient to 40°C, then to +105°C,
and returning to ambient. The V
REF
delta is then measured
between the two ambient measurements and shown in blue
in Figure 57. The same temperature sweep and measurements
were immediately repeated and the results are shown in red in
Figure 57.
Figure 57. Thermal Hysteresis
Table 15. 24-Bit Input Shift Register Contents for Internal Reference Setup Command
1
DB23
(MSB)
DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 to DB1 DB0 (LSB)
0 1 1 1 X X X X X 1/0
Command bits (C3 to C0) Address bits (A2 to A0) Don’t care Reference setup register
1
X = don’t care.
9
8
7
6
5
4
3
2
1
0
500–50–100–150–200
HITS
DISTORTION (ppm)
FIRST TEMPERATURE SWEEP
SUBSEQUENT TEMPERATURE SWEEPS
10486-062