SNAU210B March   2020  – July 2021

 

  1.   Trademarks
  2. 1Evaluation Board Setup
  3. 2EVM Description
    1. 2.1 Installing the Software
  4. 3Bringing LMX2594 to a Lock State
  5. 4Loop Filter Configuration
  6. 5Key Results to Expect
  7.   A Schematic
  8.   B Bill of Materials
  9.   C Board Layers Stack-Up
  10.   D Changing Reference Oscillator and Setup
  11.   E Connecting Reference Pro
  12.   F Ramping Feature
  13.   G SYSREF Feature
  14.   H Enabling Onboard DC-DC Buck Converter (TPS62150)
  15.   Revision History

1 Evaluation Board Setup

GUID-311EBCA3-475B-47EF-BEB9-E54FBFD5D61F-low.gif Figure 1-1 LMX2594EVM Setup
  1. Power:
    1. Set power supply to 3.3 V with 600-mA current limit and connect to VCC SMA.
  2. Input Signal:
    1. Connect a clean 100-MHz clock source to the OSCinP SMA.
  3. Programming Interface:
    • Reference Pro will provide SPI interface to program LMX2594.
    1. Connect USB cable from laptop or PC to USB port in Reference Pro. This provides power to Reference Pro board and communication with TICS GUI.
    2. Connect 10 pin ribbon cable from Reference Pro to LMX2594EVM as shown above.
  4. Output:
    1. Connect RFoutAM or RFoutAP to a phase noise analyzer. Connect a 50-Ω resistor on the unused pin if you are using a single-ended output. Use a balun if you are using a differential output.