SNAU293 May   2024 LMX1860-SEP

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Setup
      1. 2.1.1  Evaluation Setup Requirement
      2. 2.1.2  Connection Diagram
      3. 2.1.3  How to Enable Full SPI Control
      4. 2.1.4  Power Requirements
      5. 2.1.5  Pin Mode Strapping
      6. 2.1.6  Reference Clock
      7. 2.1.7  Output Connections
      8. 2.1.8  Header Information
      9. 2.1.9  Default Configuration
      10. 2.1.10 How to Generate SYSREF
      11. 2.1.11 Multiplier Mode Example
      12. 2.1.12 Divider Mode Example
      13. 2.1.13 Hybrid Mode: SPI and Pin Mode
  8. 3Software
    1. 3.1 Software Installation
    2. 3.2 Software Description
    3. 3.3 USB2ANY Interface
  9. 4Implementation Results
    1. 4.1 Buffer, Divider, and Multiplier Modes
    2. 4.2 SYSREF Generation
    3. 4.3 SYSREF Delay Generators
  10. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 PCB Layout
    3. 5.3 PCB Layer Stack-Up
    4. 5.4 Bill of Materials
  11. 6Additional Information
    1. 6.1 Troubleshooting Guide
      1. 6.1.1 General Guidance
      2. 6.1.2 If Output Is Not Seen on CLKOUT
      3. 6.1.3 If Device Features Are Not Active
      4. 6.1.4 If Multiplier Frequency Is Not Accurate
      5. 6.1.5 If Divider Frequency Is Not Accurate
      6. 6.1.6 If SYSREF Is Not Observed
    2. 6.2 Trademarks

6.1.2 If Output Is Not Seen on CLKOUT

After POR, when CLKIN is powered and enabled, CLKOUT oscillates if the EVM is default and is in buffer mode with all outputs enabled. No EVM programming is required just to get output from CLKOUT.

  • Confirm the EVM is connected to 3.3V, and draws approximately 980mA before CLKIN is applied.
  • Confirm the reference input is connected to CLKIN and the reference source is powered and enabled.
  • Confirm reference frequency is at least 300MHz, and input power is at least 0dBm.
  • Confirm enabling CLKIN increases the EVM current to approximately 1.1A.