SNAU294 May   2024 LMX1205

 

  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 Jumper Information
    2. 2.2 Setup
      1. 2.2.1 Evaluation Setup Requirement
      2. 2.2.2 Connection Diagram
    3. 2.3 Power Requirements
    4. 2.4 Reference Clock
    5. 2.5 Output Connections
    6. 2.6 Test Points
  8. 3Software
    1. 3.1 Software Description
    2. 3.2 Software Installation
    3. 3.3 USB2ANY Interface
  9. 4Implementation Results
    1. 4.1 Buffer Mode
    2. 4.2 Divider Mode
    3. 4.3 Multiplier Mode
    4. 4.4 SYSREF Generation
  10. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  11. 6Additional Information
    1. 6.1 Trademarks

4.1 Buffer Mode

After a POR or a soft reset, LMX1205 silicon default is buffer mode with all outputs enabled with maximum output power. LOGICLK is also enabled in this mode with a fixed divider value of 64. All SYSREF clocks are disabled. To evaluate the device in a different configuration, use TICS Pro.

From the top-menu, click Default Configuration → 3200MHz Buffer Mode. This automatically loads the buffer mode profile.

LMX1205EVM Buffer Mode Figure 4-1 Buffer Mode

If termination is not applied on all output pins, then manually disable the unused outputs using the CHx_EN fields (to completely power down unused channels) or the CLKOUTx_EN fields (to power down output buffers only). Powering down unused channels greatly reduces current consumption.

After the profile is loaded and required any changes have been made, click USB Communications → Write All Registers to program the device. In all of the following plots, the blue trace is the 3.2GHz reference clock from SMA100B and the black trace is the output clock from the device.

LMX1205EVM Buffer Mode Output Figure 4-2 Buffer Mode Output