SNOSB21D May   2008  – September 2016 LMH6518

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Preamplifier
        1. 7.3.1.1 Primary Output Amplifier
        2. 7.3.1.2 Auxiliary Amplifier
      2. 7.3.2 Overvoltage Clamp
      3. 7.3.3 Attenuator
      4. 7.3.4 Digital Control Block
    4. 7.4 Device Functional Modes
      1. 7.4.1 Primary Amplifier
      2. 7.4.2 Auxiliary Output
    5. 7.5 Programming
      1. 7.5.1 Logic Functions
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Oscilloscope Front End
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Settings and ADC SPI Code (ECM)
          2. 8.2.1.2.2 Input and Output Considerations
            1. 8.2.1.2.2.1 Output Swing, Clamping, and Operation Beyond Full Scale
          3. 8.2.1.2.3 Oscilloscope Trigger Applications
        3. 8.2.1.3 Application Curves
      2. 8.2.2 JFET LNA Implementation
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Attenuator Design
        3. 8.2.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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10 Layout

10.1 Layout Guidelines

Layout is critical to achieve specified performance. Circuit symmetry is necessary for good HD2 performance. Input traces must have impedance-controlled transmission lines. To reduce output to input coupling, use ground plane to fill between the amplifier input and output traces. Output termination resistors are provided on chip internally to the LMH6518. When driving an ADC, the ADC must be placed physically close to the LMH6518 output pins. Use controlled impedance transmission lines if the ADC must not placed closer than 10 mm from the amplifier output pins.

10.2 Layout Example

LMH6518 Layout_Example.gif Figure 71. LMH6518 Layout Schematic