SNAU306 June   2024 LMKDB1104

 

  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 LMKDB1104 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 Auto 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 Pins and Slew Rate 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. 8Additional Information
    1. 8.1 Trademarks
  14. 9References
4.1.3.1.1 Programmable Output Slew Rate Control

The LMKDB1104 has four registers where four 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_X are shown in Table 5-2. The default slew rate for all outputs is set to SLEWRATE_OPT_2 which is set to 0x6. The drop-down menu can be used to change the slew rate of each output from the default. To use SMBus to set the slew rate of each output, SLEWRATE_CTRL_MODE needs to be set to 1 (SLEWRATE_CTRL_MODE = 1). The LMKDB1104 default is SLEWRATE_CTRL_MODE = 0, which sets all the outputs' slew rates through the SLEWRATE_PIN.

Table 4-2 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