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

2.3.1.3 BUF802

The BUF802 device is an open-loop, unity gain buffer with a junction-gate field-effect transistor (JFET) input stage that offers low-noise, high-impedance buffering for data acquisition system (DAQ) front-ends. The device supports DC to 3.1 GHz of bandwidth while offering excellent distortion and noise performance across the frequency range.

The BUF802 can be used as a standalone buffer, Buffer Mode (BF Mode), or in a composite loop with a precision amplifier, Composite Loop Mode (CL Mode), to achieve DC precision and a wide, large-signal bandwidth. The low output impedance and high output current drive strength enables the BUF802 to drive loads as high as 50 Ω. The BUF802 comes with adjustable quiescent current to optimize system level power and performance.