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AD1585BRT-REEL7 Fiches technique(PDF) 10 Page - Analog Devices

No de pièce AD1585BRT-REEL7
Description  2.5 V to 5.0 V Micropower, Precision Series Mode Voltage References
Download  16 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD1585BRT-REEL7 Fiches technique(HTML) 10 Page - Analog Devices

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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.
VIN (V)
100
80
0
34
56
78
9
10
11
60
40
20
TA = +85 C
TA = +25 C
TA = –40 C
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
supply voltages as low as 200 mV above VOUT and up to 12 V.
However, if negative voltage is inadvertently applied to VIN with
respect to ground or any negative transient, >5 V is coupled to
VIN and the device may be damaged.


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