LT1019 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LT1019

Precision Reference

Linear Technology 

LT1019

Precision Reference

FEATURES

■ Tight Initial Output Voltage: < 0.05%

■ Ultralow Drift: 3ppm/°C Typical

■ Series or Shunt Operation

■ Curvature Corrected

■ Ultrahigh Line Rejection: ≈ 0.5ppm/V

■ Low Output Impedance: ≈ 0.02Ω

■ Plug-In Replacement for Present References

■ Available at 2.5V, 4.5V, 5V, and 10V

■ 100% Noise Tested

■ Temperature Output

■ Industrial Temperature Range in SO-8

■ Available in 8-Lead N8 and S8 Packages

U

APPLICATIO S

■ Negative Shunt References

■ A/D and D/A Converters

■ Precision Regulators

■ Constant Current Sources

■ V/F Converters

■ 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

very low TC and tight initial output voltage tolerance.

The LT1019 can both sink and source up to 10mA and can

be used in either the series or shunt mode, allowing the

reference to operate with positive or 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 and excellent

line regulation.

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.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

15V 357Ω*

0.5W 5V

IN OUT

LT1019-5

GND

A1†

LT1637

Ultralinear Strain Gauge

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

DRIFT CURVE

–50 –25 0 25 50 75

TEMPERATURE (˚C)

100 125

1019 TA02

1019fd

1

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