AD587
ΔV
OUT
(µV)
10V
V
L
100
90
1mV
2µs
1000
500
2
4
6
8
10
LOAD (mA)
V
OUT
–6
–4
–2
0
–500
–1000
00530-015
10
0%
00530-012
Figure 15. Typical Load Regulation Characteristics
Figure 12. Fine-Scale Setting for Transient Load
TEMPERATURE PERFORMANCE
The AD587 is designed for precision reference applications
where temperature performance is critical. Extensive tempera-
ture testing ensures that the device’s high level of performance is
maintained over the operating temperature range.
Some confusion exists in the area of defining and specifying
reference voltage error over temperature. Historically, references
have been characterized using a maximum deviation per degree
Celsius, such as ppm/°C. However, because of nonlinearities in
temperature characteristics that originated in standard Zener
references (such as S-type characteristics), most manufacturers
have begun to use a maximum limit error-band approach to
specify devices. This technique involves the measurement of the
output at three or more temperatures to specify an output
voltage error band.
In some applications, a varying load may be both resistive and
capacitive in nature, or the load may be connected to the
AD587 by a long capacitive cable.
1000 pF, 0 mA to 10 mA load.
V
OUT
7.0V
C
L
1000pF
1kΩ
Figure 13. Capacitive Load Transient/Response Test Circuit
10V
C
L
= 0
100
90
200mV
1µs
C
L
= 1000pF
10
0%
00530-014
V
L
Figure 14. Output Response with Capacitive Load
LOAD REGULATION
The AD587 has excellent load regulation characteristics.
changes the output by only a few microvolts.
00530-013
AD587
V
L
10V
0V
Rev. H | Page 8 of 12
AD [ ANALOG DEVICES ]
