SNAS850 December   2024 LMX1205

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Timing Diagram
    8. 5.8 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
      1. 6.1.1 Range of Dividers and Multiplier
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Power On Reset
      2. 6.3.2 Temperature Sensor
      3. 6.3.3 Clock Input
        1. 6.3.3.1 Clock Input Adjustable Delay
      4. 6.3.4 Clock Outputs
        1. 6.3.4.1 Clock Output Buffers
        2. 6.3.4.2 Clock Output Adjustable Delay
        3. 6.3.4.3 Clock MUX
        4. 6.3.4.4 Clock Divider
        5. 6.3.4.5 Clock Multiplier
          1. 6.3.4.5.1 General Information About the Clock Multiplier
          2. 6.3.4.5.2 State Machine Clock for the Clock Multiplier
            1. 6.3.4.5.2.1 State Machine Clock
          3. 6.3.4.5.3 Calibration for the Clock Multiplier
          4. 6.3.4.5.4 Lock Detect for the Clock Multiplier
      5. 6.3.5 LOGICLK Outputs
        1. 6.3.5.1 LOGICLK Output Format
        2. 6.3.5.2 LOGICLK Dividers
      6. 6.3.6 SYSREF
        1. 6.3.6.1 SYSREF Output Buffers
          1. 6.3.6.1.1 SYSREF Output Buffers for Main Clocks (SYSREFOUT)
          2. 6.3.6.1.2 LOGISYSREF Output Buffer
          3. 6.3.6.1.3 SYSREF Frequency and Delay Generation
          4. 6.3.6.1.4 SYSREFREQ Pins and SYSREFREQ SPI Controlled Fields
            1. 6.3.6.1.4.1 SYSREFREQ Pins Common-Mode Voltage
            2. 6.3.6.1.4.2 SYSREFREQ Windowing Feature
              1. 6.3.6.1.4.2.1 General Procedure Flowchart for SYSREF Windowing Operation
              2. 6.3.6.1.4.2.2 Other Guidance For SYSREF Windowing
              3. 6.3.6.1.4.2.3 For Glitch-Free Output
              4. 6.3.6.1.4.2.4 If Using SYNC Feature
              5. 6.3.6.1.4.2.5 SYNC Feature
      7. 6.3.7 Power-Up Timing
      8. 6.3.8 Treatment of Unused Pins
    4. 6.4 Device Functional Modes Configurations
  8. 7 Register Map
    1. 7.1 Device Registers
  9. 8 Application and Implementation
    1. 8.1 Reference
      1. 8.1.1 Typical Application
        1. 8.1.1.1 Design Requirements
        2. 8.1.1.2 Detailed Design Procedure
        3. 8.1.1.3 Application Plots
    2. 8.2 Power Supply Recommendations
    3. 8.3 Layout
      1. 8.3.1 Layout Guidelines
      2. 8.3.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

6.3.5.1 LOGICLK Output Format

The LOGICLKOUT0 & LOGICLKOUT1 output format can be programmed to LVDS and CML modes. Depending on the format, the common mode can be programmable or external components can be required (see Table 6-5).

LOGICLKOUT1 output common mode and format can be programmable as shown LOGISYSREFOUT configuration.

Table 6-5 LOGICLKOUT0 Formats and Properties
LOGICLK_FMT FORMAT EXTERNAL COMPONENTS REQUIRED OUTPUT LEVEL COMMON MODE
0 LVDS None Programmable through LOGICLK_PWR Programmable through LOGICLK_VCM.
2 CML Pullup Resistors

50Ω to VCC

 Programmable through LOGICLK_PWR LOGICLK_VCM has no impact, but this changes with LOGICLK_PWR.
table shows the logic clock LVDS format single ended swing and supported common mode voltage over programmable LOGICLK_VCM settings.

Table 6-6 LOGICLK LVDS Common Mode Voltage vs LOGICLK_VCM
LOGICLK_VCM LOGICLK VOD swing - Single ended pk-pk (V) LOGICLK Common Mode Voltage (V)
6 0.37 0.81
5 0.36 0.90
4 0.35 0.99
3 0.34 1.09
2 0.33 1.18
1 0.31 1.27
The following table shows the logic clock LVDS format supported LOGICLK_VCM range corresponding to LOGICLK_PWR setting.

Table 6-7 Supported LOGICLK_VCM settings
LOGICLK_PWR LOGICLK VOD swing - Single ended pk-pk (V) Supported VOCM range Supported LOGICLK_VCM range
Min code Max code
0 0.1 0.8 to 1.4 0 6
1 0.15 0.8 to 1.4 0 6
2 0.2 0.8 to 1.4 0 6
3 0.25 0.75 to 1.35 0 6
4 0.3 0.8 to 1.3 1 6
5 0.35 0.8 to 1.3 1 6
6 0.4 0.9 to 1.3 2 6
7 0.5 0.9 to 1.2 3 6