ADR4520ARZ-R7 datasheet(37/40 Pages) AD

37 / 40 page

Data Sheet

ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550

Rev. D | Page 37 of 40

–4

–2

OUTPUT VOLTAGE HYSTERESIS (ppm)

27 UNITS x 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

Figure 118. D Grade Histogram Showing the Temperature Hysteresis of the

Output Voltage (0°C to 70°C)

Measuring thermal hysteresis over the full operating temperature

range is not reflective of a typical operating environment in

most applications. Instead, smaller temperature variations are

more normal. The ADR4520/ADR4525/ADR4530/ADR4533/

ADR4540/ADR4550 were tested over 20 different temperature

cycles of increasing magnitude, centered at +25°C, starting with

+25°C ± 5°C and going up to the full operating temperature

range of −40°C to +125°C. The results are shown in Figure 119.

For a temperature delta of 100°C (that is, +25°C ± 50°C) the

thermal hysteresis is less than 20 ppm for both the full cycle

and the half cycle. Above this range, the thermal hysteresis

increases significantly. These results show that the standard

specification, which covers the full operating temperature

range, is close to the worst case performance.

100

120

140

160

–40

–20

100

TEMPERATURE DELTA (°C)

HALF LOOP

FULL LOOP

Figure 119. Thermal Hysteresis for Increasing Temperature Range

HUMIDITY SENSITIVITY

The ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/

ADR4550 is packaged in a SOIC plastic package and has a

moisture sensitivity level of MSL-1, per the JEDEC standard.

However, moisture absorption from the air into the package

changes the internal mechanical stresses on the die causing

shifts in the output voltage. Figure 120 shows the effects of a

step change in relative humidity on the output voltage over

time.

The humidity chamber is maintained at an ambient temperature

of +25°C, while the relative humidity undergoes a step change

from 20% to 80% at time zero. The relative humidity is

maintained at 80% for the duration of the testing. Note that the

output voltage shifts quickly compared to the overall settling

time, following the step change in relative humidity.

Figure 121 shows the effects of 10% increases in relative humidity

from 30% to 70% and back to 30%. Note that after the relative

humidity returns to 30%, the output voltage is settling back to

its starting point.

100

200

300

400

500

600

ELAPSED TIME (Hours)

–400

–300

–200

–100

100

200

300

400

SAMPLE 1

SAMPLE 2

SAMPLE 3

27 UNITS

TA = 25°C

RELATIVE HUMIDITY STEP

FROM 20% TO 80%

Figure 120. Change in Output Voltage vs. Time After Humidity Step Change

(20% to 80% Relative Humidity)

100

200

300

400

500

600

ELAPSED TIME (Hours)

–200

–150

–100

–50

100

150

200

SAMPLE 1

SAMPLE 2

SAMPLE 3

27 UNITS

TA = 25°C

RELATIVE HUMIDITY STEP FROM

30% TO 70% TO 30%, 10% STEPS

Figure 121. Change in Output Voltage vs. Time for 10% Humidity Steps

(30% to 70% to 30% Relative Humidity in 10% Steps)

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