SNOSB30Q October   2008  – March 2026 LMH6554

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Pin Configuration and Functions
    1.     Pin Functions
  6. 5Specifications
    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: +5 V
    6. 5.6 Typical Performance Characteristics VS = ±2.5 V
  7. 6Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
    4. 6.4 Device Functional Modes
  8. 7Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Single-Ended Input to Differential Output Operation
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1 Enable / Disable Operation
          2. 7.2.1.2.2 Single-Ended Input to Differential Output Operation
          3. 7.2.1.2.3 Driving Capacitive Loads
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Fully Differential Operation
      3. 7.2.3 Single Supply Operation
      4. 7.2.4 Driving Analog-to-Digital Converters
      5. 7.2.5 Output Noise Performance and Measurement
      6. 7.2.6 Balanced Cable Driver
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Power Supply Bypassing
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
      3. 7.4.3 Power Dissipation
      4. 7.4.4 ESD Protection
  9. 8Device and Documentation Support
    1. 8.1 Device Support
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Trademarks
  10. 9Revision History
  11.   Mechanical, Packaging, and Orderable Information

7.4.1 Layout Guidelines

The LMH6554 is a high speed, high performance amplifier. To get maximum benefit from the differential circuit architecture board layout and component selection is very critical. The circuit board has a low inductance ground plane and well bypassed broad supply lines. External components must be lead-less surface mount types. The feedback network and output matching resistors must be composed of short traces and precision resistors (0.1%). The output matching resistors must be placed within 3 or 4mm of the amplifier as well as the supply bypass capacitors. Refer to Section 7.3.1 for recommendations on bypass circuit layout. Evaluation boards are available through the product folder on ti.com.

By design, the LMH6554 is relatively insensitive to parasitic capacitance at the inputs. Nonetheless, ground and power plane metal must be removed from beneath the amplifier and from beneath RF and RG for best performance at high frequency.

With any differential signal path, symmetry is very important. Even small amounts of asymmetry can contribute to distortion and balance errors.