AD1582/AD1583/AD1584/AD1585
OUTPUT VOLTAGE HYSTERESIS
High performance industrial equipment manufacturers can
require the
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
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.
output voltage hysteresis.
80
70
60
NUMBER OF PARTS
Data Sheet
SUPPLY VOLTAGE
One of the ideal features of the
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
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
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
to attenuate line voltage ripple.
V
LOAD
DC
10kΩ
×1
10kΩ
±100µA
10kΩ
1µF
2kΩ
DUT
5µF
00701-015
50
40
30
20
10
00701-013
5V
2 × V
OUT
0
–700
–450
–200
50
ppm
300
550
±2V
Figure 13. Output Voltage Hysteresis Distribution
Figure 15. Output Impedance Test Circuit
SUPPLY CURRENT VS. TEMPERATURE
The quiescent current for the
varies slightly over temperature and input supply range.
Figure 14 illustrates the typical performance for the
reference when varying
both temperature and supply voltage. As is evident from
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
100
1µF CAP
OUTPUT IMPEDANCE (Ω)
10
AD1585
AD1582
1
100
80
T
A
= +85°C
1k
10k
FREQUENCY (Hz)
100k
1M
Figure 16. Output Impedance vs. Frequency
60
I
Q
(µA)
T
A
= +25°C
10V
10kΩ
×1
5V ± 100mV
0.22µF
V
OUT
0.22µF
00701-017
40
T
A
= –40°C
20
±200mV
10kΩ
DUT
Figure 17. Ripple Rejection Test Circuit
3
4
5
6
7
V
IN
(V)
8
9
10
11
00701-014
0
Figure 14. Typical Supply Current over Temperature
Rev. J | Page 12 of 16
00701-016
0.1
10
AD [ ANALOG DEVICES ]
