SNAU318 June   2025 LMX1205

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specifications
    4. 1.4 Device Information
  6. 2Hardware
    1. 2.1 Additional Images
    2. 2.2 Jumper Information
    3. 2.3 Multiplier Lock Detect Jumper
    4. 2.4 Setup
      1. 2.4.1 Evaluation Setup Requirement
      2. 2.4.2 Connection Diagram
    5. 2.5 Power Requirements
    6. 2.6 Reference Clock
    7. 2.7 Output Connections
    8. 2.8 Test Points
  7. 3Software
    1. 3.1 Software Description
    2. 3.2 Software Installation
    3. 3.3 USB2ANY Interface
  8. 4Implementation Results
    1. 4.1 Buffer Mode
    2. 4.2 Multiplier and Divider Modes
    3. 4.3 Logic Clock
    4. 4.4 Programmable Delay
  9. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  10. 6Additional Information
    1. 6.1 Trademarks

2.4.1 Evaluation Setup Requirement

At a minimum, evaluation of the buffer mode for all three devices requires:

  • A DC power supply capable of at least 3.3V, 5A (LDO mode) or 2.5V, 5A (bypass mode).
  • A high-quality signal source, such as an SMA100B.
  • A spectrum analyzer or phase noise analyzer.
  • A PC running Windows 7 or a more recent version with TICS Pro software installed.

Full evaluation requires a high-speed four-channel oscilloscope with a minimum of 16GHz bandwidth capable of resolving 5ps step size for SYSREF delay tuning.

For driving the primary SYSREF input, use a 2-CH arbitrary function generator or other pulse source. The pulse source must be capable of outputting complementary LVDS pulses and 1.25V ± 0.2V differential into a 100Ω DC load DC levels. Alternatively, use the primary LMX1205 to trigger the SYSREF, SYNC the dividers, and determine SYSREF windowing values.