AD5686R datasheet(27/32 Pages) AD

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Data Sheet

AD5686R/AD5685R/AD5684R

Rev. 0 | Page 27 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 59. 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 59. The same temperature sweep

and measurements were immediately repeated and the

results are shown in red in Figure 59.

Figure 59. Thermal Hysteresis

Table 15. 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

1 X = don’t care.

–50

–100

–150

–200

DISTORTION (ppm)

FIRST TEMPERATURE SWEEP

SUBSEQUENT TEMPERATURE SWEEPS

AD5686R Datasheet(PDF) 27 Page - Analog Devices