SBAA591 December   2023 REF54

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Flicker Noise Measurement Method
  6. 30.1 Hz to 10 Hz Band Pass Filter Design for Reference Noise Measurement
    1. 3.1 Filter Schematic
    2. 3.2 TINA - TI simulations
    3. 3.3 Component Selection
  7. 4Measurement Setup
    1. 4.1 REF54250CDR Noise Measurement Setup
  8. 5Filter Board Design
    1. 5.1 Schematic
      1. 5.1.1 Schematics Images
    2. 5.2 Layout
    3. 5.3 Bill of Materials
  9. 6References

Abstract

This application note describes low flicker noise (0.1 Hz to 10 Hz band) measurement methodology and test setup recommendations for precision series references. Low noise measurement requires ultra-low setup noise, which can be achieved by selecting low-noise BOM for the band pass filter and proper design or layout techniques. The lowest noise reference REF54250CDR (flicker noise = 275 nV pk-pk with 100 μF capacitor on NR pin) is used to illustrate the component selection and board design to measure the noise floor with < 1.5% error from the measurement setup.