AD5671R datasheet(29/32 Pages) AD

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Data Sheet

AD5671R/AD5675R

Rev. B | Page 29 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 66. It is measured by

sweeping the temperature from ambient to −40°C, then to +125°C,

and returning to ambient. The VREF delta is then measured

between the two ambient measurements and shown in blue in

Figure 66. The same temperature sweep and measurements

were immediately repeated, and the results are shown in red in

Figure 66.

Figure 66. Thermal Hysteresis

Table 17. 24-Bit Input Shift Register Contents for Internal Reference and Amplifier Gain Setup Command1

DB23 (MSB)

DB22

DB21

DB20

DB19

DB18

DB17

DB16

DB1 to DB3

DB2

DB1

DB0 (LSB)

1/0

Command bits (C3 to C0)

Address bits (A3 to A0)

Don’t care

Amplifier

gain

Reserved

Reference setup

X means don’t care.

–130 –110

–90

–70

–50

–30

–10

DISTORTION (ppm)

FIRST TEMPERATURE SWEEP

SUBSEQUENT TEMPERATURE SWEEPS

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