AD5686R datasheet(27/31 Pages) AD

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Data Sheet

AD5686R/AD5685R/AD5684R

Rev. D | Page 27 of 31

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 the temperature from ambient to −40°C, then to

+105°C, and returning to ambient. The VREF 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

LONG-TERM TEMPERATURE DRIFT

Figure 58 shows the change in the VREF (ppm) value after

1000 hours at 25°C ambient temperature.

Figure 58. Reference Drift Through to 1000 Hours

Table 16. 24-Bit Input Shift Register Contents for Internal Reference Setup Command1

DB23

(MSB)

DB22

DB21

DB20

DB19

DB18

DB17

DB16

DB15 to DB1

DB0 (LSB)

1/0

Command bits (C3 to C0)

Address bits (A2 to A0)

Don’t care

Reference setup register

X means don’t care.

–50

–100

–150

–200

DISTORTION (ppm)

FIRST TEMPERATURE SWEEP

SUBSEQUENT TEMPERATURE SWEEPS

140

120

100

200

300

400

500

600

700

800

900

1000

–20

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