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

1.1 Introduction

The LMX1860-SEP EVM is an ultra-low additive-jitter RF buffer, divider, and multiplier, with integrated SYSREF generation capability. A separate auxiliary clock divider can be used for FPGAs or other logic ICs. Each RF output (and the logic clock) is paired with a complementary SYSREF output with picosecond-precision delay-tuning capability, and can be operated as a generator (with synchronization capability across multiple devices) or as a repeater.

The EVM can be operated with a 3.3V supply voltage when the onboard LDOs are utilized. The LDOs can be bypassed, in this case the supply voltage is 2.5V.

The EVM contains LMX1860-SEP, two LDOs, a microcontroller and an IO expander. LMX1860-SEP and the LDOs can support –55ºC to +125ºC operation. For high temperature evaluation, use an USB2ANY dongle to control the EVM.