ad1582crt-reel7 Analog Devices, Inc., ad1582crt-reel7 Datasheet - Page 12

• Manufacturer Part Number: ad1582crt-reel7
• Description: 2.5 V To 5.0 V Micropower, Precision Series Mode Voltage References
• Manufacturer: Analog Devices, Inc.

AD1582/AD1583/AD1584/AD1585
OUTPUT VOLTAGE HYSTERESIS
High performance industrial equipment manufacturers can
require the AD1582/AD1583/AD1584/AD1585 to maintain a
consistent output voltage error at 25°C after the references are
operated over the full temperature range. All references exhibit
a characteristic known as output voltage hysteresis; however, the
AD1582/AD1583/AD1584/AD1585 are designed to minimize
this characteristic. This phenomenon can be quantified by mea-
suring 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 13 displays the distribution of the AD1582/AD1583/
AD1584/AD1585 output voltage hysteresis.
SUPPLY CURRENT VS. TEMPERATURE
The quiescent current for the AD1582/AD1583/AD1584/
AD1585 varies slightly over temperature and input supply
range. Figure 14 illustrates the typical performance for the
AD1582/AD1583/AD1584/AD1585 reference when varying
both temperature and supply voltage. As is evident from
Figure 14, the AD1582/AD1583/AD1584/AD1585 supply
current increases only 1.0 μA/V, making this device extremely
attractive for use in applications where there can be wide
variations in supply voltage and a need to minimize power
dissipation.
100
80
60
40
20
80
70
60
50
40
30
20
10
0
0
–700
3
Figure 14. Typical Supply Current over Temperature
Figure 13. Output Voltage Hysteresis Distribution
4
–450
T
5
A
= +85°C
–200
T
A
6
= –40°C
V
IN
ppm
7
(V)
50
T
A
= +25°C
8
300
9
550
10
11
Rev. H | Page 12 of 16
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 V
if negative voltage is inadvertently applied to V
ground, or any negative transient >5 V is coupled to V
device can be damaged.
AC PERFORMANCE
To apply the AD1582/AD1583/AD1584/AD1585, it is impor-
tant to understand the effects of dynamic output impedance
and power supply rejection. In Figure 15, a voltage divider
is formed by the AD1582/AD1583/AD1584/ AD1585 output
impedance and by the external source impedance. Figure 16
shows the effect of varying the load capacitor on the reference
output. Power supply rejection ratio (PSRR) should be determined
when characterizing the ac performance of a series voltage
reference. Figure 17 shows a test circuit used to measure PSRR,
and Figure 18 demonstrates the ability of the AD1582/AD1583/
AD1584/AD1585 to attenuate line voltage ripple.
2 × V
100
±2V
0.1
10
1
OUT
±200mV
10
10V
10kΩ
10kΩ
Figure 16. Output Impedance vs. Frequency
Figure 15. Output Impedance Test Circuit
Figure 17. Ripple Rejection Test Circuit
10kΩ
10kΩ
100
×1
×1
FREQUENCY (Hz)
±100µA
1k
AD1585
0.22µF
10kΩ
OUT
V
AD1582
5V ± 100mV
LOAD
10k
1µF
and up to 12 V. However,
1µF CAP
DUT
2kΩ
DC
DUT
V
100k
5V
OUT
IN
0.22µF
with respect to
IN
5µF
, the
1M