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

1.4 Device Information

These LMX devices are high performance, high reliability, wideband phase-locked loop (PLL) with integrated voltage controlled oscillator (VCO) that can generate any frequency from 4.88MHz to 28GHz. These devices run from a single 3.3V supply and has integrated LDOs that eliminate the need for onboard low noise LDOs.

These LMX devices have two output channels, the channels can support direct VCO output, divided down output and VCO doubler output. Output channel B can also support SYSREF clock output. Output can be quickly muted through pin control, response time is as short as 10ns. This feature is especially useful for ping-pong switching application. See SNAA357 for details.

Multiple LMX devices can be synchronized so that the output phases are aligned. Output phase with respect to the input reference clock is also adjustable.

With a new Full Assist operation, VCO lock time is greatly reduced to within 20µs.

Configuration of these LMX devices is made through SPI programming. These LMX devices can operate without SPI programming using pin strapping in Pin mode.

These LMX devices are fabricated in Texas Instruments' advanced BiCMOS process and is available in a 64-lead 10mm × 10mm QFP plastic package.