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

Introduction

For SAR ADCs, poor design of reference voltage circuits leads to inaccurate conversions of sampled signals. It is therefore necessary to evaluate the circuits that are driving the ADC References when designing a system that utilizes the ADCs included in C2000 real-time MCUs. This application report recommends a few reference circuit topologies and briefly highlights the ideas presented in the video series on ADC Reference Circuits by TI Precision Labs - Driving the reference input on a SAR ADC in the specific context of the ADCs on C2000 real-time MCUs.