SNOS749G September   1995  – November 2025 LMC6772 , LMC6772-Q1

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Pin Configuration and Functions
  6. 5Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Operating Ratings
    3. 5.3 2.7V Electrical Characteristics
    4. 5.4 5.0V and 15.0V Electrical Characteristics
    5. 5.5 AC Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6Application Information
    1. 6.1 Application Information Disclaimer
    2. 6.2 Input Common-Mode Voltage Range
    3. 6.3 Low Voltage Operation
    4. 6.4 Output Short Circuit Current
    5. 6.5 Hysteresis
    6. 6.6 Spice Macromodel
    7. 6.7 Typical Applications
      1. 6.7.1 Universal Logic Level Shifter
      2. 6.7.2 One-Shot Multivibrator
      3. 6.7.3 Bi-Stable Multivibrator
      4. 6.7.4 Zero Crossing Detector
      5. 6.7.5 Oscillator
  8. 7Device and Documentation Support
    1. 7.1 Documentation Support
    2. 7.2 Trademarks
    3. 7.3 Electrostatic Discharge Caution
    4. 7.4 Glossary
  9. 8Revision History
  10. 9Mechanical, Packaging, and Orderable Information

6.7.4 Zero Crossing Detector

LMC6772 Zero Crossing DetectorFigure 6-7 Zero Crossing Detector

A voltage divider of R4 and R5 establishes a reference voltage V1 at the non-inverting input. By making the series resistance of R1 and R2 equal to R5, the comparator will switch when VIN = 0. Diode D1 insures that V3 never drops below −0.7V. The voltage divider of R2 and R3 then prevents V2 from going below ground. A small amount of hysteresis is setup to ensure rapid output voltage transitions.