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PDF ( 数据手册 , 数据表 ) X60008D-25

零件编号 X60008D-25
描述 (X60008x-25) Precison 2.5V FGA Voltage Reference
制造商 Xicor
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X60008D-25 数据手册, 描述, 功能
Precision 2.5V FGA™ Voltage Reference
X60008B-25
X60008C-25
X60008D-25
FEATURES
DESCRIPTION
• Output Voltage: 2.500V
The X60008-25 FGA™ voltage references are very
• Absolute Initial Accuracy Options:
high precision analog voltage references fabricated in
±0.5mV & ±1.0mV
Xicor’s proprietary Floating Gate Analog technology,
• Ultra Low Power Supply Current: 500nA
• Low Temperature Coefficient options:
3, 5 & 10ppm/°C
m• 10 mA Source & Sink Current Capability
o• 10 ppm/1000hrs Long Term Stability
• Supply Voltage Range: 4.5V to 6.5V
.c• 5kV ESD (Human Body Model)
• Standard Package: SOIC-8
t4U• Temp Range: -40°C to +85°C
which achieves superior levels of performance when
compared to conventional band gap, buried zener, or
XFET™ technologies.
FGA™ voltage references feature very high initial
accuracy, very low temperature coefficient, excellent
long term stability, low noise and excellent line and
load regulation, at the lowest power consumption
currently available. These voltage references enable
advanced applications for precision industrial &
portable systems operating at significantly higher
accuracy and lower power levels than can be achieved
with conventional technologies.
eAPPLICATIONS
e• High Resolution A/Ds & D/As
• Digital Meters
h• Calibration Systems
S• V-F Converters
• Precision Current Sources
• Precision Regulators
• Precision Oscillators
• Battery Management Systems
• Smart sensors
• Strain Gage Bridges
• Threshold Detectors
• Servo Systems
ataTYPICAL APPLICATION
.DVIN = +5.0V
wVIN VOUT
w X60008-25
w heet4U.comGND
0.1µF
Serial
Bus
10µF
0.001µF(*)
REF IN
Enable
SCK
SDAT
16 to 24-bit
A/D Converter
www.DataSREV 1.2.6 4/22/04
www.xicor.com
(*)Also see Figure 3 in Applications Information
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X60008D-25 pdf, 数据表
X60008B-25, X60008C-25, X60008D-25
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.
400
350
300
250
200
150
100
50
0
1
X60008-25 NOISE REDUCTION
CL = 0
CL = .001µF
CL = .1µF
CL = .01µF & 10µF + 2kohm
10 100 1000 10000 100000
Figure 3.
VIN = 6.5V
.1µF
10µF
VIN
VO
X60008-25
GND
.01µF
2K
10µF
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.
X60008 TURN-ON TIME (25°C)
6
VIN
5
4
690 nA
3
VOUT
2
520 nA
1 320 nA
0
-1 1
35
TIME (mSec)
7
9
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, (VHIGH
VLOW), and divide by the temperature extremes of
measurement (THIGH – TLOW). The result is divided by
the nominal reference voltage (at T=25°C) and multi-
plied by 106 to yield ppm/°C. This is the “Box” method.
REV 1.2.6 4/22/04
www.xicor.com
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