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參數(shù)資料
| 型號： | ADM1014 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual PCI Hot-PlugTM Controller |
| 中文描述： | 雙PCI熱PlugTM控制器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 167K |
| 代理商： | ADM1014 |
AD1582/AD1583/AD1584/AD1585
–11–
REV. A
TURN-ON TIME
Many low power instrument manufacturers are becoming
increasingly concerned with the turn-on characteristics of the
components being used in their systems. Fast turn-on compo-
nents often enable the end user to save power by keeping power
off when it is not needed. Turn-on settling time is defined as the
time required, after the application of power (cold start), for the
output voltage to reach its final value within a specified error.
The two major factors affecting this are the active circuit settling
time and the time required for the thermal gradients on the chip
to stabilize. Figure 18a shows the turn-on settling and transient
response test circuit. Figure 18b displays the turn-on character-
istic of the AD1582. This characteristic is generated from cold-
start operation and represents the true turn-on waveform after
power up. Figure 18c shows the fine settling characteristics of
the AD1582. Typically, the reference settles to within 0.1% of
its final value in about 100
μ
s.
The device can momentarily draw excessive supply current
when V
SUPPLY
is slightly below the minimum specified level.
Power supply resistance must be low enough to ensure reliable
turn-on. Fast power supply edges minimize this effect.
0V OR 10V
0V TO 10V
5V OR 10V
0V OR 5V
0.22 F
DUT
0.22 F
V
OUT
10k
10k
X1
Figure 18a. Turn-On/Transient Response Test Circuit
10
0%
100
90
20 s
5V
20 s
1V
Figure 18b. Turn-On Characteristics
10
0%
100
90
20 s
5V
20 s
1mV
Figure 18c. Turn-On Settling
DYNAMIC PERFORMANCE
Many A/D and D/A converters present transient current loads
to the reference, and poor reference response can degrade the
converter’s performance. The AD1582/3/4/5 family of refer-
ences has been designed to provide superior static and dynamic
line and load regulation. Since these series references are
capable of both sourcing and sinking large current loads, they
exhibit excellent settling characteristics.
Figure 19 displays the line transient response for the AD1582.
The circuit utilized to perform such a measurement is displayed
in Figure 18a, where the input supply voltage is toggled from
5 V to 10 V and the input and output capacitors are each 0.22
μ
F.
Figures 20 and 21 show the load transient settling characteris-
tics for the AD1582 when load current steps of 0 mA to 5 mA
and 0 mA to –1 mA are applied. The input supply voltage
remains constant at 5 V, the input decoupling and output load
capacitors are 4.7
μ
F and 1
μ
F respectively, and the output current
is toggled. For both positive and negative current loads, the
reference responses settle very quickly and exhibit initial voltage
spikes less than 10 mV.
10
0%
100
90
50 s
5V
50 s
200mV
Figure 19. Line Transient Response
10
0%
100
90
20 s
5V
20 s
5mV
Figure 20. Load Transient Response (0 mA to 5 mA Load)
10
0%
100
90
20 s
5V
20 s
5mV
Figure 21. Load Transient Response
(0 mA to –1 mA Load)
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