SNAU277B April   2022  – February 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 Additional Images
    2. 2.2 Setup
      1. 2.2.1 Connection Diagram
      2. 2.2.2 Power Supply
      3. 2.2.3 Clock Output
      4. 2.2.4 EVM Strap Options
        1. 2.2.4.1 J1 Header
        2. 2.2.4.2 J2 Header
        3. 2.2.4.3 J3 Header
        4. 2.2.4.4 J4 Header
        5. 2.2.4.5 J5 Header
        6. 2.2.4.6 J6 Header
      5. 2.2.5 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 Schematic
    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

2.2.5 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 FORMAT COUPLING COMPONENT VALUE
LVPECL AC R1, R5 0Ω
R2, R4 150Ω
C1, C4 0.01 uF
R3 DNP
DC(1) R1, R5, C1, C4 0Ω
R2, R3, R4 DNP
LVDS (2) AC R1, R5 0Ω
R3 100Ω
C1, C4 0.01 uF
R2, R4 DNP
DC R1, R5, C1, C4 0Ω
R3 100Ω
R2, R4 DNP
HCSL AC R1, R5 0Ω
R2, R4 50Ω
C1, C4 0.01 uF
R3 DNP
DC R1, R5, C1, C4 0Ω
R2, R4 50Ω
R3 DNP
(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 FORMAT COUPLING COMPONENT VALUE
LVPECL AC R10, R16 0Ω
R11, R15 150Ω
C5, C8 0.01 uF
R12 DNP
DC(1) R10, R16, C5, C8 0Ω
R11, R12, R15 DNP
LVDS(2) AC R10, R16 0Ω
R12 100Ω
C5, C8 0.01 uF
R11, R15 DNP
DC R10, R16, C5, C8 0Ω
R12 100Ω
R11, R15 DNP
HCSL AC R10, R16 0Ω
R11, R15 50Ω
C5, C10 0.01 uF
R12 DNP
DC R10, R16, C5, C8 0Ω
R11, R15 50Ω
R12 DNP
(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.