SNAU298A October   2023  – October 2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2EVM Quick Start
    1. 2.1 Hardware Setup
    2. 2.2 Software Setup
      1. 2.2.1 TICS Pro GUI Setup
      2. 2.2.2 Power Up Sequence
    3. 2.3 EVM Measurements
  8. 3Hardware
    1. 3.1 Device Operation Modes
    2. 3.2 EVM Configuration
      1. 3.2.1 Power Supply
      2. 3.2.2 Logic Input and Outputs
      3. 3.2.3 Clock Input
      4. 3.2.4 Clock Outputs
      5. 3.2.5 Status Outputs, LEDs, and Test Points
  9. 4Software
    1. 4.1 TICS Pro LMKDB1120 Software
      1. 4.1.1 Input
        1. 4.1.1.1 Input Interface Type
        2. 4.1.1.2 Input Termination
        3. 4.1.1.3 Automatic Output Disable (AOD)
        4. 4.1.1.4 LOS Event
        5. 4.1.1.5 LOS Readback
      2. 4.1.2 Device Info and EVM Setup
        1. 4.1.2.1 Device Info
        2. 4.1.2.2 EVM Setup
        3. 4.1.2.3 SMBus
      3. 4.1.3 Output
        1. 4.1.3.1 SMBus
          1. 4.1.3.1.1 Programmable Output Slew Rate Control
        2. 4.1.3.2 OE Pin Control
        3. 4.1.3.3 Side Band Interface (SBI)
  10. 5Implementation Results
    1. 5.1 Typical Phase Noise Characteristic
  11. 6Hardware Design Files
    1. 6.1 Schematics
    2. 6.2 PCB Layouts
    3. 6.3 Bill of Materials (BOM)
  12. 7Compliance Information
    1. 7.1 Compliance and Certifications
  13. 8References
  14. 9Revision History

3.2.3 Clock Input

LMKDB1120 can support different input interfaces depending on the input swing and common mode voltage. There are four input interfaces type that can be configured on LMKDB1120 using external components and internal termination schemes as shown in Figure 3-1. If using signal generator, then make sure to populate R34 with a 100Ω resistor or use internal or external 50Ω termination to ground.

  1. DC Coupled HCSL/LP HCSL Input.
  2. DC Coupled LVDS Input.
  3. External AC Coupled Input.
  4. Internal 50Ω to ground terminations.
LMKDB1120EVM Input Interfaces Figure 3-1 Input Interfaces

How to setup all different interfaces supported by LMKDB1120 is outlined in Table 3-7.

Table 3-7 Input Interfaces
Input Interface Configuration
DC coupled HCSL or LP-HCSL This is default EVM and device configuration. R33 and R37 values are 0Ω and Input Interface Type on Input page is selected to DC Coupled.
DC coupled LVDS input Populate R34 with a 100Ω resistor and set Input Interface Type on Input page to DC Coupled.
External AC coupled input Replace R33 and R37 with 0.1uF capacitor and set Input Interface Type on Input page to AC Coupled.
Internal termination To enable internal 50Ω to ground terminations, set the Input Termination on Input page to Enabled.