AD1582 Analog Devices, AD1582 Datasheet - Page 10

• Manufacturer Part Number: AD1582
• Description: 2.5V Micropower, Precisions Series Mode Voltage References
• Manufacturer: Analog Devices

AD1582/AD1583/AD1584/AD1585
VOLTAGE OUTPUT NONLINEARITY VS. 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 refer-
ence 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
end point 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.
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 mini-
mize this characteristic. This phenomenon can be quantified by
measuring the change in the 25°C output voltage after tem-
perature excursions from 85°C to 25°C, and –40°C to +25°C.
Figure 12 displays the distribution of the AD1582 output volt-
age hysteresis.
250
200
150
100
–50
50
0
–50
–25
0
TEMPERATURE – C
25
50
75
100
SUPPLY CURRENT VS. TEMPERATURE
The quiescent current for the AD1582/AD1583/AD1584/AD1585
family of references will vary 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.
SUPPLY VOLTAGE
One of the ideal features of AD1582/AD1583/AD1584/AD1585 is
its low supply voltage headroom. The part can operate at
supply voltage as low as 200 mV above V
However, if negative voltage is inadvertently applied to V
respect to ground or any negative transient, >5 V is coupled to
V
IN
, the device can be damaged.
100
80
70
60
50
40
30
20
10
80
60
40
20
0
0
–700
3
4
–450
T
5
A
= +85 C
–200
T
A
6
= –40 C
V
IN
ppm
7
– Volts
50
T
A
= +25 C
8
300
OUT
9
and up to 12 V.
550
10
11
IN
with