SNOSB21E May   2008  – July 2024 LMH6518

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
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Input Preamplifier
        1. 6.3.1.1 Primary Output Amplifier
        2. 6.3.1.2 Auxiliary Amplifier
      2. 6.3.2 Overvoltage Clamp
      3. 6.3.3 Attenuator
      4. 6.3.4 Digital Control Block
    4. 6.4 Device Functional Modes
      1. 6.4.1 Primary Amplifier
      2. 6.4.2 Auxiliary Output
    5. 6.5 Programming
      1. 6.5.1 Logic Functions
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Oscilloscope Front End
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1 Settings and ADC SPI Code (ECM)
          2. 7.2.1.2.2 Input and Output Considerations
            1. 7.2.1.2.2.1 Output Swing, Clamping, and Operation Beyond Full Scale
          3. 7.2.1.2.3 Oscilloscope Trigger Applications
        3. 7.2.1.3 Application Curves
      2. 7.2.2 JFET LNA Implementation
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
          1. 7.2.2.2.1 Attenuator Design
        3. 7.2.2.3 Application Curve
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
      2. 8.1.2 Device Nomenclature
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RGH|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3.2 Overvoltage Clamp

The LMH6518 features two levels of clamps used to protect the amplifier and the ADC from voltage transients. These clamps are placed after the input preamplifier and also after the final output amplifier. The clamp voltages are set by the preamp and ladder attenuator logic functions. The SPI bus is used to set and control the preamp (HG or LG) and ladder attenuator (0-dB to 20-dB, 10 states) logic functions.