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参数资料
| 型号： | AD1587 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Precision Shunt Mode Voltage References(微功耗,精密电压基准) |
| 中文描述： | 精密并联模式电压基准（微功耗，精密电压基准） |
| 文件页数： | 2/11页 |
| 文件大小： | 107K |
| 代理商： | AD1587 |
–10–
PRELIM. B, JUNE 96
AD1586/7/8/9
NOISE PERFORMANCE AND REDUCTION
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 that affect this are the active circuit
settling time and the time required for the thermal gradients on
the chip to stabilize. Figure 15a shows the turn-on settling and
transient response test circuit. Figure 15b displays the turn-on
characteristic of the AD1586. This characteristic is generated
from cold-start operation and represents the true turn-on
waveform after power up. Figure 15c shows the fine settling
characteristics of the AD1586. Typically, the reference settles to
within 0.1% of its final value in about 25
s.
The noise generated by the AD1586 is typically less then 30
V
pk-pk over the 0.1 Hz to 10 Hz frequency band. Figure 13
shows the 0.1 Hz to 10 Hz noise of a typical AD1586. The noise
measurement is made with a high gain bandpass filter. Noise in a
10 Hz to 10 kHz region is approximately 50
V rms. Figure 14
shows the broadband noise of a typical AD1586. If further noise
reduction is desired, a 1-pole low pass filter may be added
between the output pin and ground. A time constant of X.X ms
will have a -3 dB point at roughly 800 Hz and will reduce the
high frequency noise to about X.X
V rms.
Figure 13. 0.1 - 10 Hz Voltage Noise
Figure 14. 10 Hz to 10 kHz RMS Noise
Figure 15a. Turn-On / Transient Response Test Circuit
Figure 15b. Turn-On Characteristics
Figure 15c. 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.
Figure 16 displays both the coarse and fine settling characteris-
tics of the AD1586 to load transients of +/- 50
A. The circuit
used to perform such measurements is displayed in Figure 15a,
where the input supply voltage is toggled from 3V to 5V (+50
A) and 5V to 3V (-50 A).
Figure 16a shows the settling characteristics of the device for an
increased reverse current of 50
A. Figure 16b shows the
settling characteristics when the reverse current is decreased by
50
A. In both cases, the transients settle to within 1 mV in
approximately X
s.
Attempts to drive large capacitive loads (in excess of 1,000 pF)
with the AD1586/7/8/9 family may result in the ringing shown in
Figure 17. This is due to the additional poles formed by the load
capacitor and the output impedance of the reference. A recom-
mended method of driving capacitive loads of this magnitude is
shown in Figure 15a. Here, the resistor isolates the capacitive
load from the output stage, while the capacitor provides a single
pole low pass filter that lowers the output noise.
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相关代理商/技术参数 |
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| AD1589444WG | 制造商:Analog Devices 功能描述: |
| AD158FL | 制造商:Johnson Components 功能描述:ADAPT - Bulk 制造商:EMERSON CONNECTIVITY SOLUTIONS 功能描述:Adapter, TRS Female to TRS Female, 4 Lug |
| AD-15FT4-G1 | 制造商:Pan Pacific 功能描述: |
| AD-15FT6-BK2 | 制造商:Pan Pacific 功能描述:Conn RJ-45-D-Sub Adapter F/F 6/15 POS ST 1 Port |
| AD-15FT6-G1 | 制造商:Pan Pacific 功能描述:Conn RJ-45-D-Sub Adapter F/F 6/15 POS ST 1 Port |
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