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

4.2.5.2 Category 3 SYNC

The SYNC pulse being used for Category 3 synchronization requires a certain setup and hold time with respect to the input reference clock. This requirement is to verify that all the devices use the same input clock edge to start synchronization. MASH_RST_COUNT must be set to provide sufficient time for the synchronization to complete.

LMX2624SPEVM LMX2695SEPEVM LMX2824EPEVM Category 3 SYNC Configuration Figure 4-35 Category 3 SYNC Configuration

If a non time-critical SYNC pulse is used for Category 3 SYNC, or after a VCO calibration, the phase between devices is not identical.

LMX2624SPEVM LMX2695SEPEVM LMX2824EPEVM Not Synchronous Example 1Figure 4-36 Not Synchronous Example 1
LMX2624SPEVM LMX2695SEPEVM LMX2824EPEVM Not Synchronous Example 2Figure 4-37 Not Synchronous Example 2

With a time-critical SYNC pulse, the output phase is aligned. Please note that the output phase of each device can not be exactly the same, but the difference remain unchanged after synchronization.

LMX2624SPEVM LMX2695SEPEVM LMX2824EPEVM Time Critical SYNC PulseFigure 4-38 Time Critical SYNC Pulse
LMX2624SPEVM LMX2695SEPEVM LMX2824EPEVM Category 3 SYNCFigure 4-39 Category 3 SYNC