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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9 Power Supply Recommendations

The LMH6581 requires two power supplies. The analog signal path is powered by a single 5-V (±5%) supply and the digital control is powered by a single 3.3-V (±5%) supply. The 5-V supply must be capable of providing the 230 mA of quiescent current plus any load current. Ensure the loads of both amplifiers are included.

The 3.3-V digital supply requires only a small, 400-µA current.

Supply bypass capacitors must be placed at pins 3, 4, and 12. Low-ESR, ceramic capacitors of 0.01 µF are recommended.