LT1019 Precision Reference UFEATURESDESCRIPTIO ■ Tight Initial Output Voltage: < 0.05% The LT®1019 is a third generation bandgap voltage refer- ■ Ultralow Drift: 3ppm/ ° C Typical ence utilizing thin film technology and a greatly improved ■ Series or Shunt Operation curvature correction technique. Wafer level trimming of ■ Curvature Corrected both reference and output voltage combines to produce ■ Ultrahigh Line Rejection: ≈ 0.5ppm/V very low TC and tight initial output voltage tolerance. ■ Low Output Impedance: ≈ 0.02Ω The LT1019 can both sink and source up to 10mA and can ■ Plug-In Replacement for Present References be used in either the series or shunt mode, allowing the ■ Available at 2.5V, 4.5V, 5V, and 10V reference to operate with positive or negative output ■ 100% Noise Tested voltages without external components. Minimum input/ ■ Temperature Output output voltage is less than 1V in the series mode, providing ■ Industrial Temperature Range in SO-8 improved tolerance of low line conditions and excellent ■ Available in 8-Lead N8 and S8 Packages line regulation. UAPPLICATIO S The LT1019 is available in four voltages: 2.5V, 4.5V, 5V and 10V. It is a direct replacement for most bandgap ■ Negative Shunt References references presently available including AD580, AD581, ■ A/D and D/A Converters REF-01, REF-02, MC1400, MC1404 and LM168. ■ Precision Regulators , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Constant Current Sources All other trademarks are the property of their respective owners. ■ V/F Converters ■ Bridge Excitation UTYPICAL APPLICATIONUltralinear Strain GaugeOutput Voltage Drift 15V 357Ω* 0.5W 5V 1.003 R3 IN OUT 1.002 10ppm/°C 2M 350Ω FULL TEMP RANGE “BOX” LT1019-5 BRIDGE GND R2 1.001 20k – LT1019 + 1.000 CURVE A1† A2 R4 GAIN = 100 LT1637 20k +LT1001 – 0.999 5ppm/°C ACTIVE 0°C TO 70°C “BOX” ELEMENT R5 0.998 UNCOMPENSATED 2M R6** OUTPUT VOLTAGE (NORMALIZED) (V) “STANDARD” BANDGAP 2M DRIFT CURVE 0.997 –50 –25 0 25 50 75 100 125 –5V LT1019 • TA01 TEMPERATURE (˚C) 357Ω* *REDUCES REFERENCE AND AMPLIFIER 0.5W LOADING TO ≈0. 1019 TA02 **IF R6 = R3, BRIDGE IS NOT LOADED BY R2 AND R4. –15V A1 V † OS AND DRIFT ARE NOT CRITICAL BECAUSE A2 ACTS AS A DIFFERENTIAL AMPLIFIER. 1019fd 1
