LT1019
Precision Reference
FEATURES
s Tight Initial Output Voltage: < 0.05%
s Ultralow Drift: 3ppm/°C Typical
s Series or Shunt Operation
s Curvature Corrected
s Ultrahigh Line Rejection: ≈ 0.5ppm/V
s Low Output Impedance: ≈ 0.02Ω
s Plug-In Replacement for Present References
s Available at 2.5V, 4.5V, 5V, and 10V
s 100% Noise Tested
s Temperature Output
s Industrial Temperature Range in SO-8
U
APPLICATIO S
s Negative Shunt References
s A/D and D/A Converters
s Precision Regulators
s Constant Current Sources
s V/F Converters
s Bridge Excitation
DESCRIPTIO
The LT®1019 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
15V 357Ω*
0.5W 5V
IN OUT
LT1019-5
GND
+
A1†
LT1637
–
Ultralinear Strain Guage
350Ω
BRIDGE
ACTIVE
ELEMENT
– 5V
357Ω*
0.5W
– 15V
R3
2M
R2
20k –
R4 A2
20k +LT1001
GAIN = 100
R5
2M R6**
2M
LT1019 • TA01
*REDUCES REFERENCE AND AMPLIFIER
LOADING TO ≈0.
**IF R6 = R3, BRIDGE IS NOT LOADED BY R2 AND R4.
†A1 VOS AND DRIFT ARE NOT CRITICAL BECAUSE A2
ACTS AS A DIFFERENTIAL AMPLIFIER.
Output Voltage Drift
1.003
1.002
1.001
1.000
10ppm/°C
FULL TEMP RANGE “BOX”
LT1019
CURVE
0.999
5ppm/°C
0°C TO 70°C “BOX”
0.998
UNCOMPENSATED
“STANDARD” BANDGAP
0.997
–50 –25
DRIFT CURVE
0 25 50 75
TEMPERATURE (˚C)
100 125
1019 TA02
1
