TIDUDA6A December   2017  – January 2022

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1 System Description
    1. 1.1 Key System Specifications
  7. 2 System Overview
    1. 2.1 Block Diagram
    2. 2.2 System-Level Description
    3. 2.3 Highlighted Products
      1. 2.3.1 Analog Signal Chain
        1. 2.3.1.1 LMH5401
        2. 2.3.1.2 LHM6401
        3. 2.3.1.3 BUF802
      2. 2.3.2 Clock
        1. 2.3.2.1 LMK61E2
        2. 2.3.2.2 LMK04828
        3. 2.3.2.3 LMX2594
      3. 2.3.3 Power
        1. 2.3.3.1 TPS82130
        2. 2.3.3.2 TPS7A84
    4. 2.4 System Design Theory
      1. 2.4.1 High-Speed, Low-Phase Noise Clock Generation
      2. 2.4.2 Channel-to-Channel Skew
      3. 2.4.3 Deterministic Latency
        1. 2.4.3.1 Importance of Deterministic Latency
      4. 2.4.4 Analog Front End
      5. 2.4.5 Multichannel System Power Requirement
      6. 2.4.6 Hardware Programming
  8. 3 Circuit Design
    1. 3.1 Analog Input Front End
      1. 3.1.1 High-Input Impedance Buffer Implementation Using the BUF802
    2. 3.2 High-Speed Multichannel Clocking
    3. 3.3 Power Supply Section
      1. 3.3.1 DC-DC
        1. 3.3.1.1 How to Set 2.1-V Output Voltage
      2. 3.3.2 LDOs
  9. 4 Host Interface
  10. 5 Hardware Functional Block
  11. 6 Getting Started Application GUI
  12. 7 Testing and Results
    1. 7.1 Test Setup and Test Plan
    2.     44
    3. 7.2 SNR Measurement Test
    4. 7.3 Channel-to-Channel Skew Measurement Test
    5. 7.4 Performance Test Result
    6. 7.5 Multichannel Skew Measurement
    7. 7.6 49
  13. 8 Design Files
    1. 8.1 Schematics
    2. 8.2 Bill of Materials
    3. 8.3 Altium Project
    4. 8.4 Gerber Files
    5. 8.5 Assembly Drawings
  14. 9 Software Files
  15. 10Related Documentation
    1. 10.1 Trademarks
  16. 11About the Authors
    1. 11.1 Acknowledgment
  17. 12Revision History

2.3.1.2 LHM6401

The LMH6401 is a wideband, digitally-controlled variable gain amplifier (DVGA) designed for DC-to-radio frequency applications. The noise and distortion performance are optimized to drive ultra-wideband ADCs. The device offers DC 4.5-GHz bandwidth at a 26-dB gain and gain range from –6 dB to 26 dB in 1-dB steps. The gain control can be done using a standard serial peripheral interface (SPI) and the user can power down the device by using either the power down pin or SPI.