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
4.1.3.1.1 Output Slew Rate Control

The LMKDB1204 has 4 registers where 4 different slew rate values can be stored. After storing the desired slew rate values in SLEWRATE_OPT_# registers, 1 of those 4 slew rates can be assigned to each output by using the drop-down menus next to the desired output. There are 16 different slew rate values possible, where 0x0 is the fastest slew rate and 0xF is the slowest slew rate.

The default slew rate values for each SLEWRATE_OPT_# are shown in Table 5-4. The default slew rate for all outputs is set to SLEWRATE_OPT_2 = 0x6. For more information, refer to the LMKDB1204 data sheet (SNAS855).

Table 4-4 Default SLEWRATE_OPT_# Values
Register Field Name Default Value Default Slew Rate
SLEWRATE_OPT_1 0x0 Fastest
SLEWRATE_OPT_2 0x6 Fast (default for all outputs)
SLEWRATE_OPT_3 0xA Slow
SLEWRATE_OPT_4 0xF Slowest