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

G SYSREF Feature

  1. Configure TICS Pro PLL tab for SYSREF.
    • Check the SYSREF_EN box and VCO_PHASE_SYNC box.
    • Change OUTB_MUX to SysRef and uncheck the OUT_PD box.
    • Confirm the Interpolator frequency is between 800 MHz and 1500 MHz. If not, change the SYSREF_DIV_PRE drop-down to Div2 or Div4.
    • To modify SYSREF frequency, change the value in the SYSREF_DIV box.
    • Go to User Controls in the side bar, make sure the INPIN_IGNORE box is unchecked.
  2. Click the Toggle SysRefReq Pin box to initiate SYSREF.
    GUID-948CCA52-14A1-41BB-B607-475B4FEFD67F-low.png Figure G-1 SYSREF Example
Table G-1 SYSREF Modes
MODE NAME DESCRIPTION TICS PRO - SYS REF SETTINGS
Master - Continuos LMX2594 generates SysRef pulses as long as SysRefReq pin is held high. Default mode. See quick start instructions
Master - Pulse LMX2594 generates a finite number of pulses as long as the SysRefReq pin is held high. Note: SysRefReq must be held high for the duration of the pulses.
  • Uncheck SysRefReq under Pins in User Controls tab
  • Check SYSREF_PULSE
  • Set SYSREF_PULSE_CNT to desired number of pulses
  • Check SysRefReq under Pins in User Controls tab
Repeater RFOUTB will repeat external input to SysRefReq pin. Output will be reclocked to LMX2594 internal frequency
  • Uncheck SysRefReq
  • Check SysRef_Repeat