SDAA203 November   2025 AFE7920

 

  1.   1
  2.   Abstract
  3. 1Introduction
  4. 2Issue Phenomenon and Observations
  5. 3Introduction to Phase Locked Loop (PLL)
  6. 4Design
  7. 5Summary
  8. 6References

Abstract

This report introduces the cause and design when the AFE7920 PLL alarm occurs at a specific temperature. Since the AFE7920 is a complex IC that integrates various digital and analog blocks, effectively identifying and resolving the cause when an alarm occurs is one of the most important factors. While there are various reasons why a PLL alarm can occur, this application report demonstrates the basic operating principles of the PLL and explains why the PLL unlock phenomenon occurs only at a specific temperature.