參數(shù)資料
型號: X60008D-25
英文描述: Precision 2.5V FGA Voltage Reference(2.5V FGA 精密電壓基準)
中文描述: FGA中2.5V的精密電壓基準電壓(2.5V FGA中精密電壓基準)
文件頁數(shù): 8/10頁
文件大?。?/td> 587K
代理商: X60008D-25
X60008B-25, X60008C-25, X60008D-25
8 of 10
REV 1.2.6 4/22/04
www.xicor.com
filter with a corner frequency at 1/10 of the center
frequency and 1-pole low-pass filter with a corner
frequency at 10 times the center frequency. Figure 2
also shows the noise in the 10KHz to 1MHz band can
be reduced to about 50μVp-p using a .001μF capacitor
on the output. Noise in the 1KHz to 100KHz band can
be further reduced using a 0.1μF capacitor on the
output, but noise in the 1Hz to 100Hz band increases
due to instability of the very low power amplifier with a
0.1μF capacitance load. For load capacitances above
.001μF the noise reduction network shown in fig. 3 is
recommended. This network reduces noise sig-
nificantly over the full bandwidth. As shown in fig. 2,
noise is reduced to less than 40μVp-p from 1Hz to
1MHz using this network with a .01μF capacitor and a
2Kohm resistor in series with a 10μF capacitor.
Figure 2.
Figure 3.
Turn-On Time
The X60008 devices have ultra-low supply current and
thus the time to bias up internal circuitry to final values
will be longer than with higher power references. Nor-
mal turn-on time is typically 7ms. This is shown in the
graph, Figure 4. Since devices can vary in supply cur-
rent down to 300nA, turn-on time can last up to about
12ms. Care should be taken in system design to
include this delay before measurements or conver-
sions are started.
Figure 4.
Temperature Coefficient
The limits stated for temperature coefficient (tempco)
are governed by the method of measurement. The
overwhelming standard for specifying the temperature
drift of a reference is to measure the reference voltage
at two temperatures, take the total variation, (V
HIGH
V
LOW
), and divide by the temperature extremes of
measurement (T
HIGH
– T
LOW
). The result is divided by
the nominal reference voltage (at T=25°C) and multi-
plied by 10
6
to yield ppm/°C. This is the “Box” method.
CL = 0
CL = .001μF
CL = .1μF
CL = .01μF & 10μF + 2kohm
400
350
300
250
200
150
100
50
0
1
10
100
1000
10000
100000
X60008-25 NOISE REDUCTION
N
V
IN
= 6.5V
V
IN
V
O
GND
X60008-25
.01μF
10μF
2K
.1μF
10μF
0
1
2
3
4
5
6
-1
1
3
5
7
9
690 nA
520 nA
320 nA
V
IN
V
OUT
X60008 TURN-ON TIME (25
°
C)
TIME (mSec)
V
I
O
相關(guān)PDF資料
PDF描述
X60008B-41(中文) Precision 4.096V FGA Voltage Reference(4.096V FGA 精密電壓基準)
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X60008B-41 Precision 4.096V FGA Voltage Reference(4.096V FGA 精密電壓基準)
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