SNOS792E May   1999  – December 2024 LM6172

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics ±15V
    6. 5.6 Electrical Characteristics ±5V
    7. 5.7 Typical Characteristics: D (SOIC, 8) Package
    8. 5.8 Typical Characteristics: P (PDIP, 8) Package
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Slew Rate
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Circuit Operation
      2. 7.1.2 Reduce Settling Time
      3. 7.1.3 Drive Capacitive Loads
      4. 7.1.4 Compensation for Input Capacitance
      5. 7.1.5 Termination
    2. 7.2 Typical Application
      1. 7.2.1 Application Circuits
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Power Supply Bypassing
      2. 7.3.2 Power Dissipation
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 Printed Circuit Boards and High-Speed Op Amps
        2. 7.4.1.2 Using Probes
        3. 7.4.1.3 Components Selection and Feedback Resistor
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.1.3 Drive Capacitive Loads

Amplifiers that drive capacitive loads can oscillate or ring at the output. To eliminate oscillation or reduce ringing, place an isolation resistor as shown in Figure 7-1. The combination of the isolation resistor and the load capacitor forms a pole to increase stability by adding more phase margin to the overall system. The desired performance depends on the value of the isolation resistor; the bigger the isolation resistor, the more damped (slow) the pulse response becomes. For the LM6172, a 50Ω isolation resistor is recommended for initial evaluation.

LM6172 Isolation Resistor Used to Drive Capacitive LoadFigure 7-1 Isolation Resistor Used to Drive Capacitive Load
LM6172 The LM6172 Driving a 510pF Load With a 30Ω Isolation ResistorFigure 7-2 The LM6172 Driving a 510pF Load With a 30Ω Isolation Resistor
LM6172 The LM6172 Driving a 220pF Load With a 50Ω Isolation ResistorFigure 7-3 The LM6172 Driving a 220pF Load With a 50Ω Isolation Resistor