SNAA320B November   2019  – January 2024 LM4040-N , LM4050-N , LM4120 , LM4128 , LM4128-Q1 , LM4132 , LM4132-Q1 , REF102 , REF1925 , REF1930 , REF1933 , REF1941 , REF20-Q1 , REF200 , REF2025 , REF2030 , REF2033 , REF2041 , REF2125 , REF2912 , REF2920 , REF2925 , REF2930 , REF2933 , REF2940 , REF3012 , REF3020 , REF3025 , REF3030 , REF3033 , REF3033-Q1 , REF31-Q1 , REF3112 , REF3120 , REF3125 , REF3130 , REF3133 , REF3140 , REF3212 , REF3212-EP , REF3220 , REF3220-EP , REF3225 , REF3225-EP , REF3230 , REF3230-EP , REF3233 , REF3240 , REF3312 , REF3318 , REF3320 , REF3325 , REF3330 , REF3333 , REF34-Q1 , REF3425 , REF3425-EP , REF3430 , REF3430-EP , REF3433 , REF3433-EP , REF3440 , REF3440-EP , REF3450 , REF35 , REF4132 , REF4132-Q1 , REF5010 , REF5020 , REF5020-EP , REF5020A-Q1 , REF5025 , REF5025-EP , REF5025-HT , REF5025A-Q1 , REF5030 , REF5030A-Q1 , REF5040 , REF5040-EP , REF5040A-Q1 , REF5045 , REF5045A-Q1 , REF5050 , REF5050-EP , REF5050A-Q1 , REF54 , REF6125 , REF6133 , REF6141 , REF6145 , REF6150 , REF6225 , REF6230 , REF6233 , REF6241 , REF6245 , REF6250 , REF70 , TL431LI , TL432LI , TLV431

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Analog-to-Digital Converter Error
  6. 3 Voltage Reference DC Error
    1. 3.1 Initial Accuracy and Solder Shift
    2. 3.2 Temperature Drift
    3. 3.3 Line Regulation
  7. 4 DC Error Calculations
  8. 5 Calibration
  9. 6 Voltage Reference Noise Error
    1. 6.1 1/f Noise
    2. 6.2 Broadband Noise
    3. 6.3 Power Supply Rejection Ratio
    4. 6.4 Noise Example
  10. 7 Dynamic Error (Voltage Reference Driving Capability)
  11. 8 Low Power Applications
  12. 9 References
  13. 10Revision History

3.3 Line Regulation

Line regulation is defined as change in the output voltage of a reference with respect to change in the supply voltage in the specified region. Line regulation error directly gets translated into gain error. This is critical for battery operated systems where input varies as the battery power goes down. A LDO with good line regulation spec is used as the supply for the reference to improve the line regulation performance of the system. This also applies to systems where the VIN varies on the input of the voltage reference due to other loads on the same rail.