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522983B Datasheet

  • 522983B

  • IC

  • 12頁(yè)

  • ETC

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LT1019
Precision Reference
FEATURES
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DESCRIPTIO
Available at 2.5V, 4.5V, 5V, and 10V
Plug-In Replacement for Present References
Ultra-Low Drift: 3ppm/擄C Typical
Curvature Corrected
Series or Shunt Operation
Ultra-High Line Rejection:
鈮?.5ppm/V
Low Output Impedance:
鈮?/div>
0.02鈩?/div>
Tight Initial Output Voltage: < 0.05%
Can Be Heated for Drifts Below 2ppm/擄C
100% Noise Tested
Temperature Output
The LT1019 is a third generation bandgap voltage refer-
ence utilizing thin film technology and a greatly improved
curvature correction technique. Wafer level trimming of
both reference and output voltage combines to produce
units with high yields to very low TC and tight initial
tolerance of output voltage.
The LT1019 can both sink and source up to 10mA and can
be used in either the series or shunt mode. This allows the
reference to be used for both positive and negative output
voltages without external components. Minimum input/
output voltage is less than 1V in the series mode, providing
improved tolerance of low line conditions.
The LT1019 is available in four voltages: 2.5V, 4.5V, 5V,
and 10V. It is a direct replacement for most bandgap
references presently available including AD580, AD581,
REF-01, REF-02, MC1400, MC1404, and LM168.
For ultra-low drift applications (< 2ppm/擄C), the LT1019
can be operated in a heated mode by driving an internal
resistor with an external amplifier. Chip temperature can
be externally set for minimum power consumption.
APPLICATI
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A/D and D/A Converters
Precision Regulators
Constant Current Sources
V/F Converters
Bridge Excitation
TYPICAL APPLICATI
15V
357鈩?
0.5W
IN
OUT
5V
Ultralinear Strain Guage
1.003
OUTPUT VOLTAGE (NORMALIZED) (V)
LT1019-5
GND
350鈩?/div>
BRIDGE
R3
2M
R2
20k
R4
20k
+
A1
鈥?/div>
LT301A
A2
LT1001
GAIN = 100
鈥?/div>
ACTIVE
ELEMENT
R5
2M
R6**
2M
LT1019 鈥?TA01
鈥?V
357鈩?
0.5W
鈥?5V
*REDUCES REFERENCE AND AMPLIFIER
LOADING TO
鈮?.
**IF R6 = R3, BRIDGE IS NOT LOADED BY R2 AND R4.
鈥?/div>
A1 V
OS
AND DRIFT ARE NOT CRITICAL BECAUSE A2
ACTS AS A DIFFERENTIAL AMPLIFIER.
U
Output Voltage Drift
1.002
1.001
1.000
0.999
0.998
0.997
鈥?0 鈥?5
LT1019
CURVE
10ppm/擄C
FULL TEMP RANGE 鈥淏OX鈥?/div>
5ppm/擄C
0擄C TO 70擄C 鈥淏OX鈥?/div>
UNCOMPENSATED
鈥淪TANDARD鈥?BANDGAP
DRIFT CURVE
50
25
75
0
TEMPERATURE (藲C)
100
125
LT1019 鈥?TA02
+
鈥?/div>
UO
UO
1

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