SNAU277C April   2022  – October 2024 LMK6C , LMK6D , LMK6H , LMK6P

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Evaluation Module Contents
    3. 1.3 Evaluation Setup Requirement
  6. 2Hardware
    1. 2.1 Setup
      1. 2.1.1 Connection Diagram
      2. 2.1.2 Power Supply
      3. 2.1.3 Clock Output
      4. 2.1.4 EVM Strap Options
        1. 2.1.4.1 J1 Header
        2. 2.1.4.2 J2 Header
        3. 2.1.4.3 J3 Header
        4. 2.1.4.4 J4 Header
        5. 2.1.4.5 J6 Header
        6. 2.1.4.6 J7 Header
        7. 2.1.4.7 J8 Header
      5. 2.1.5 Configuring the Clock Output Termination
  7. 3Implementation Results
    1. 3.1 Typical Measurement
      1. 3.1.1 Phase Noise
  8. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layout and Layer Stack-Up
      1. 4.2.1 PCB Layer Stack-Up
      2. 4.2.2 PCB Layout
    3. 4.3 Bill of Materials
  9. 5Additional Information
    1. 5.1 Trademarks
  10. 6References
  11. 7Revision History

2.1.5 Configuring the Clock Output Termination

The LMK6EVM comes pre-populated with an AC-coupled LVCMOS termination. The termination can be modified by the user to support LVPECL, LVDS, and HCSL output formats according to the component values in the table below.

Table 2-1 Output Termination Schemes for Y1
OUTPUT FORMATCOUPLINGCOMPONENTVALUE
LVPECLACR1, R50Ω
R2, R4210Ω
C1, C40.01µF
R3DNP
DC(1)R1, R5, C1, C40Ω
R2, R3, R4DNP
LVDS (2)ACR1, R50Ω
R3100Ω
C1, C40.01µF
R2, R4DNP
DCR1, R5, C1, C40Ω
R3100Ω
R2, R4DNP
HCSLACR1, R50Ω
R2, R450Ω
C1, C40.01µF
R3DNP
DCR1, R5, C1, C40Ω
R2, R450Ω
R3DNP
(1) 50Ω to Vcc – 2V termination is required on the receiver.
(2) 100Ω differential termination (R3) is provided on the LMK6EVM. Removing the differential termination on the EVM is possible if the differential termination is available on the receiver.
Table 2-2 Output Termination Schemes for Y2
OUTPUT FORMATCOUPLINGCOMPONENTVALUE
LVPECLACR10, R160Ω
R11, R15210Ω
C5, C80.01µF
R12DNP
DC(1)R10, R16, C5, C80Ω
R11, R12, R15DNP
LVDS(2)ACR10, R160Ω
R12100Ω
C5, C80.01µF
R11, R15DNP
DCR10, R16, C5, C80Ω
R12100Ω
R11, R15DNP
HCSLACR10, R160Ω
R11, R1550Ω
C5, C100.01µF
R12DNP
DCR10, R16, C5, C80Ω
R11, R1550Ω
R12DNP
(1) 50Ω to Vcc - 2V termination is required on the receiver.
(2) 100Ω differential termination (R3) is provided on the LMK6EVM. Removing the differential termination on the EVM is possible if the differential termination is available on the receiver.