SNAU308A November   2024  – May 2025

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Setup
      1. 2.1.1 Evaluation Setup Requirement
      2. 2.1.2 Connection Diagram
    2. 2.2 Jumper Information
    3. 2.3 Power Requirements
    4. 2.4 Reference Clock
    5. 2.5 Output Connections
    6. 2.6 Test Points
  9. 3Software
    1. 3.1 Software Description
    2. 3.2 Software Installation
    3. 3.3 USB2ANY Interface
  10. 4Implementation Results
    1. 4.1 Evaluation Setup
    2. 4.2 Performance Data and Results
      1. 4.2.1 RF Output
      2. 4.2.2 VCO Calibration
        1. 4.2.2.1 No Assist Operation
        2. 4.2.2.2 Full Assist Operation
      3. 4.2.3 SYSREF
        1. 4.2.3.1 SYSREF Clock Generation
        2. 4.2.3.2 SYSREF Pulse Generation
        3. 4.2.3.3 SYSREF Repeater Mode
      4. 4.2.4 Phase Adjustment
      5. 4.2.5 Phase Synchronization
        1. 4.2.5.1 Category 1b and Category 2 SYNC
        2. 4.2.5.2 Category 3 SYNC
      6. 4.2.6 Pin Mode
  11. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  12. 6Additional Information
    1. 6.1 Debug Information
    2. 6.2 Trademarks
  13. 7Revision History

4.2.5.1 Category 1b and Category 2 SYNC

Category 1b and Category 2 SYNC requires putting the LMX device in SYNC mode. That means, VCO_PHASE_SYNC = 1. Please note, in SYNC mode, the maximum fPD is 50MHz.

For Category 1b SYNC, enabling SYNC mode is sufficient. After programming the devices, the output phases are all be aligned.

For Category 2 SYNC, in addition to putting the devices in SYNC mode, a non-time-critical SYNC pulse is required to trigger all devices to synchronize. The SYNC pulse can be given by an external source or by toggling the SYNC pin LOW-HIGH-LOW. Click the Toggle Sync pin button toggles the SYNC pin L-H-L once.

LMX2624SPEVM LMX2695SEPEVM LMX2824EPEVM Category 1b SYNCFigure 4-33 Category 1b SYNC
LMX2624SPEVM LMX2695SEPEVM LMX2824EPEVM Category 2 SYNCFigure 4-34 Category 2 SYNC