SNAU266A July   2021  – August 2022

 

  1.   Abstract
  2. 1First-Time Setup
    1. 1.1 Evaluation Module Contents
    2. 1.2 Evaluation Setup Requirements
  3. 2EVM Connections
    1. 2.1 Connection Diagram
    2. 2.2 Power Supply
    3. 2.3 Reference Clock
    4. 2.4 Output Connections
    5. 2.5 Programming Interface
  4. 3Feature Evaluation
    1. 3.1 Buffer, Divider, and Multiplier Modes
    2. 3.2 SYSREF Generation
    3. 3.3 SYSREF Delay Generators
  5. 4Schematic
  6. 5PCB Layout and Layer Stack-Up
    1. 5.1 PCB Layer Stack-Up
    2. 5.2 PCB Layout
  7. 6Bill of Materials
  8.   A Troubleshooting
  9.   B USB2ANY Firmware Upgrade
  10.   C Revision History

2.4 Output Connections

Connect any of the CLKOUT SMA connectors to a signal analyzer. All CLKOUT connections are AC-coupled at the LMX1204EVM and can be connected directly to RF instruments with 0VDC requirements; an additional DC block is not required. The unused CLKOUT SMA connector must be terminated with a 50-Ω load, or a differential connection may be used if a balun with a suitable frequency range is available.

If additional hardware such as a high-speed oscilloscope and phase noise analyzer are available, they may also be connected to the output SMA connectors. Recommended oscilloscope connections include one CLKOUT and one SYSREF output from the same channel, as well as the one LOGICLK and one LOGISYS output.

Other unused CLKOUT SMA connectors should be terminated with 50-Ω single-ended or 100-Ω differential load, or alternately should be disabled in software, to minimize unterminated output effects on performance.