Datasheet

Data Sheet ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550
Rev. B | Page 33 of 37
THERMAL HYSTERESIS
In addition to stability over time, as described in the Long-Term
Drift section, it is useful to know the thermal hysteresis, that is,
the stability vs. cycling of temperature. Thermal hysteresis is an
important parameter because it tells the system designer how
closely the signal returns to its starting amplitude after the
ambient temperature changes and subsequent return to room
temperature. Figure 87 shows the change in output voltage as
the temperature cycles three times from room temperature to
+125°C to −40°C and back to room temperature.
In the three full cycles, the output hysteresis is typically −13 ppm.
The histogram in Figure 88 shows that the hysteresis is larger
when the device is cycled through only a half cycle, from room
temperature to 125°C and back to room temperature, typically
−97 ppm.
–40 –20 0 20 40 60 80 100 120
TEMPERATURE (°C)
CHANGE IN OUTPUT VOLTAGE (ppm)
V
SY
= 5V
CYCLE 1
CYCLE 2
CYCLE 3
10203-799
–250
–200
–150
–100
–50
50
0
100
150
200
250
Figure 88. Change in Output Voltage over Three Full Temperature Cycles
(−40°C to +125°C )
–200 –160 –120 –80 –40 0 40 80 100
OUTPUT VOLT
AGE HYSTERESIS (ppm)
0
10
20
30
40
50
60
70
80
NUMBER OF UNITS
V
SY
= 5V
27 UNITS × 3 CYCLES
HALF CYCLE = +26°C, +125°C, +26°C
FULL
CYCLE = +26°C, +125°C, +26°C, –40°C, +26°C
HALF CYCLE
FULL CYCLE
10203-801
Figure 89. Histogram Showing the Temperature Hysteresis of the Output
Voltage (−40°C to +125°C)
Figure 89 shows the change in input offset voltage as the
temperature cycles three times from room temperature to
+70°C to 0°C and back to room temperature. In the three full
cycles, the output hysteresis is typically −8 ppm. The histogram
in Figure 90 shows that the hysteresis is larger when the device
is cycled through only a half cycle, from room temperature to
+70°C and back to room temperature, typically −17 ppm.
0 10 20 30 40 50 60 70
TEMPERATURE (°C)
CHANGE IN OUTPUT VOLTAGE (ppm)
V
SY
= 5V
CYCLE 1
CYCLE 2
CYCLE 3
10203-800
Figure 90. Change in Output Voltage over Three Full Temperature Cycles
(0°C to 70°C)
–80 –70 –60 –50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80
OUTPUT VOLTAGE HYSTERESIS (ppm)
0
10
20
30
40
50
60
NUMBER OF UNITS
V
SY
= 5V
27 UNITS × 3 CYCLES
HALF CYCLE = 25°C, 70°C, 25°C
FULL CYCLE = 25°C, 70°C, 25°C, 0°C, 25°C
HALF CYCLE
FULL CYCLE
10203-802
Figure 91. Histogram Showing the Temperature Hysteresis of the Output
Voltage (0°C to 70°C)
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