AD1582/AD1583/AD1584/AD1585

–10–

REV. D

VOLTAGE OUTPUT NONLINEARITY VERSUS

TEMPERATURE

When using a voltage reference with data converters, it is impor-

tant to understand the impact that temperature drift can have on

the converter’s performance. The nonlinearity of the reference

output drift represents additional error that cannot easily be

calibrated out of the overall system. To better understand the

impact such a drift can have on a data converter, refer to Figure 5

where the measured drift characteristic is normalized to the

endpoint average drift. The residual drift error of the AD1582

of approximately 200 ppm demonstrates that this family of

references is compatible with systems that require 12-bit

accurate temperature performance.

TEMPERATURE ( C)

250

–50

–50

100

–25

0

25

5075

200

150

100

50

0

Figure 5. Residual Drift Error

OUTPUT VOLTAGE HYSTERESIS

High performance industrial equipment manufacturers may

require the AD1582/AD1583/AD1584/AD1585 family to maintain

a consistent output voltage error at 25

°C after the references are

operated over the full temperature range. While all references

exhibit a characteristic known as output voltage hysteresis, the

AD1582/AD1583/AD1584/AD1585 family is designed to minimize

this characteristic. This phenomenon can be quantified by

measuring the change in the +25

°C output voltage after

temperature excursions from +125

°C to +25°C, and from –40°C

to +25

°C. Figure 6 displays the distribution of the AD1582

output voltage hysteresis.

ppm

–700

–450

–200

50

300

550

0

10

20

30

40

50

60

70

80

Figure 6. Output Voltage Hysteresis Distribution

SUPPLY CURRENT VERSUS TEMPERATURE

The quiescent current for the AD1582/AD1583/AD1584/AD1585

family of references varies slightly over temperature and input

supply range. Figure 7 demonstrates the typical performance

for the AD1582 reference when varying both temperature and

supply voltage. As is evident from the graph, the AD1582 supply

current increases only 1.0

µA/V, making this device extremely

attractive for use in applications where there may be wide varia-

tions in supply voltage and a need to minimize power dissipation.

100

80

0

34

56

78

9

10

11

60

40

20

Figure 7. Typical Supply Current over Temperature

SUPPLY VOLTAGE

One of the ideal features of the AD1582/AD1583/AD1584/AD1585

is low supply voltage headroom. The parts can operate at

respect to ground or any negative transient, >5 V is coupled to