Datasheet

AD1582/AD1583/AD1584/AD1585 Data Sheet
Rev. J | Page 12 of 16
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.
80
70
60
50
–700 –450 –200 50 300 550
NUMBER OF PARTS
40
30
20
10
0
ppm
0
0701-013
Figure 13. Output Voltage Hysteresis Distribution
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
0
I
Q
(µA)
V
IN
(V)
34567891011
T
A
= +25°C
T
A
= +85°C
T
A
= –40°C
00701-014
Figure 14. 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 V
OUT
and up to 12 V. However,
if negative voltage is inadvertently applied to V
IN
with respect to
ground, or any negative transient >5 V is coupled to V
IN
, the
device can be damaged.
AC PERFORMANCE
To apply the AD1582/AD1583/AD1584/AD1585, it is important
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.
5V
5µF
1µF
2×V
OUT
10kΩ
10kΩ
2kΩ
10kΩ
±2V
±100µA
×1
V
LOAD
DC
DUT
0
0701-015
Figure 15. Output Impedance Test Circuit
100
AD1585
AD1582
10
1
0.1
10
100
1k 10k 100k 1M
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
1µF CAP
0
0701-016
Figure 16. Output Impedance vs. Frequency
5V ± 100mV
0.22µF
0.22µF
10V
10kΩ
10kΩ
±200mV
×1
DUT
V
OUT
0
0701-017
Figure 17. Ripple Rejection Test Circuit