SPRABY5 January   2024 TMS320F2800132 , TMS320F2800133 , TMS320F2800135 , TMS320F2800137 , TMS320F2800152-Q1 , TMS320F2800153-Q1 , TMS320F2800154-Q1 , TMS320F2800155 , TMS320F2800155-Q1 , TMS320F2800156-Q1 , TMS320F2800157 , TMS320F2800157-Q1 , TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1 , TMS320F280033 , TMS320F280034 , TMS320F280034-Q1 , TMS320F280036-Q1 , TMS320F280036C-Q1 , TMS320F280037 , TMS320F280037-Q1 , TMS320F280037C , TMS320F280037C-Q1 , TMS320F280038-Q1 , TMS320F280038C-Q1 , TMS320F280039 , TMS320F280039-Q1 , TMS320F280039C , TMS320F280039C-Q1 , TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1 , TMS320F28075 , TMS320F28075-Q1 , TMS320F28076 , TMS320F28374D , TMS320F28374S , TMS320F28375D , TMS320F28375S , TMS320F28375S-Q1 , TMS320F28376D , TMS320F28376S , TMS320F28377D , TMS320F28377D-EP , TMS320F28377D-Q1 , TMS320F28377S , TMS320F28377S-Q1 , TMS320F28378D , TMS320F28378S , TMS320F28379D , TMS320F28379D-Q1 , TMS320F28379S

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Symptoms of an Unreliable Reference
    2. 1.2 ADC Principle of Operation
    3. 1.3 Layout Guidelines
    4. 1.4 Key Reference Buffer Specifications
    5. 1.5 VREFHI Example for C2000 MCUs
  5. 2Unbuffered Reference
  6. 3Buffered Reference
  7. 4VDDA as Reference Voltage for ADC
  8. 5Summary
  9. 6References
  10. 7ADC Related Collateral

2 Unbuffered Reference

GUID-20231220-SS0I-MZWT-P5JX-MNRB3X5QCJ9L-low.svg Figure 2-1 Unbuffered Reference

This topology uses a single voltage reference part to drive multiple C2000 ADCs. This topology is sufficient for driving up to three ADCs in 12-bit single-ended and differential modes. It is also acceptable for driving up to three 16-bit single-ended ADCs, but it is recommended to use a buffered reference to drive 16-bit differential ADCs. It is important to use a sufficient bypass capacitor on the output of the reference IC for the best performance.