SNAU307A May   2024  – May 2024 LMKDB1204

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1 Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2 EVM 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. 3 Hardware
    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. 4 Software
    1. 4.1 TICS Pro LMKDB1204 Software
      1. 4.1.1 Input
        1. 4.1.1.1 Input Selection (CLKIN_SEL Register)
        2. 4.1.1.2 Input Interface Type
        3. 4.1.1.3 Input Termination
        4. 4.1.1.4 Auto Output Disable (AOD)
        5. 4.1.1.5 LOS Event
        6. 4.1.1.6 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 Output Slew Rate Control
        2. 4.1.3.2 OE and ZOUT_SEL Pin Control
  10. 5 Implementation Results
    1. 5.1 Typical Phase Noise Characteristic
  11. 6 Hardware Design Files
    1. 6.1 Schematics
    2. 6.2 PCB Layouts
    3. 6.3 Bill of Materials (BOM)
  12. 7 Compliance Information
    1. 7.1 Compliance and Certifications
  13. 8 Additional Information
    1. 8.1 Trademarks
  14. 9 References
  15. 10Revision History

3.2.3 Clock Input

LMKDB1204 can support different input interfaces for either CLKIN depending on the input swing and common mode voltage. There are four input interfaces type that can be configured on LMKDB1204 using external components and internal termination schemes as shown in Figure 4-1. If using a signal generator, then make sure to populate R12 and/or R23 with a 100Ω resistor or use internal / 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.
LMKDB1204EVM Input Interfaces Figure 3-1 Input Interfaces

Table 4-8 outlines how to setup all different interfaces supported by LMKDB1204.

Table 3-8 Input Interfaces
Input Interface Configuration
DC coupled HCSL / LPHCSL (default) This is the default for the EVM for both clock inputs. R10, R13 and/or R20, R24 values are 0Ω and Input Interface Type on Input page is selected to DC Coupled for each input.
DC coupled LVDS input Populate R12 and/or R23 with a 100Ω resistor and set Input Interface Type on Input page to DC Coupled for each DC coupled LVDS input.
External AC coupled input Replace R10, R13 and/or R20, R24 with 0.1uF capacitor and set Input Interface Type on Input page to AC Coupled for each external AC coupled input.
Internal termination To enable internal 50Ω to ground terminations. Set the Input Termination on Input page to Enabled.