SNAS889 March   2026 LMK6B

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Environmental Compliance
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Thermal Information
    6. 6.6 Electrical Characteristics
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Characteristics
  8. 7 Parameter Measurement Information
    1. 7.1 Device Output Configurations
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Features Description
      1. 8.3.1 Bulk Acoustic Wave (BAW)
      2. 8.3.2 Device Block-Level Description
      3. 8.3.3 Function Pins
      4. 8.3.4 Output Terminations
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Clocking TI Clock Buffers with the LMK6Bx
      4. 9.2.4 Application Curves
        1. 9.2.4.1 LVDS Phase Noise Curves
        2. 9.2.4.2 AC-LVPECL Phase Noise Curves
        3. 9.2.4.3 LP-HCSL Phase Noise Curves
    3. 9.3 Replacing Competitor Oscillators with the LMK6Bx
      1. 9.3.1 Replacing a LVPECL oscillator with the LMK6Bx
      2. 9.3.2 Replacing a HCSL OSC With the LMK6Bx
    4. 9.4 Power Supply Recommendations
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
        1. 9.5.1.1 Providing Thermal Reliability
        2. 9.5.1.2 Recommended Solder Reflow Profile
      2. 9.5.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Mechanical Data
    2. 12.2 Tape and Reel Information

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8.3.4 Output Terminations

The LMK6Bx has different output types: AC-LVPECL, LVDS, HS-LVDS, LP-HCSL, and Custom Swing. HS-LVDS and Custom Swing have different swing and common mode options. LP-HCSL output type has different VOH options. For more information refer to Section 4.

The multi-mode driver can create an output with a common mode set to VDD/2 or 1.2V and a customizable swing from 350mVppd to 2Vppd. For the Custom Swing output type, the VCM = VDD/2 and the swing can be set from 350mVppd to 2Vppd for 3.3V supply and 350mVppd to 1.5Vppd for 2.5V supply. AC-LVPECL output type uses this driver to generate a 1.6Vppd with a VCM = VDD/2 for either 2.5V or 3.3V. The multi-mode driver can also generate an LVDS-like (including HS-LVDS) output, which has a 1.2V common mode and a customizable swing from 350mVppd to 2Vppd for a 3.3V supply and 350mVppd to 1.6Vppd for a 2.5V supply. By default, the LVDS driver comes with a 800mVppd swing.

To maximize the performance of the oscillator, use the Custom Swing multi-mode driver or AC-LVPECL. Better performance is achieved with a higher swing, so order the highest swing the receiver can handle.

No changes are required to replace an LVDS oscillator with the LMK6Bx. If replacing an LVDS oscillator for an AC-coupled applications and maximum performance is required, use the Custom Swing or AC-LVPECL output type and order the highest swing option the receiver can handle. No changes are required when replacing an LVDS oscillator with the Custom Swing or AC-LVPECL driver for AC-coupled applications. To replace an LVPECL oscillator refer to Section 9.3.1. Termination schemes for AC-LVPECL, LVDS, HS-LVDS, and Custom Swing are shown in Figure 8-2.

LMK6B AC-LVPECL, LVDS, HS-LVDS, and Custom Swing Output Terminations Figure 8-2 AC-LVPECL, LVDS, HS-LVDS, and Custom Swing Output Terminations

The LP-HCSL output driver can have a VOH of 850mV or 750mV typical. No external termination is required as shown in Figure 8-3. No changes are required to replace a LP-HCSL oscillator with the LMK6Bx. To replace a HCSL oscillator with the LMK6Bx, refer to Section 9.3.2.

LMK6B LP-HCSL Output Termination Figure 8-3 LP-HCSL Output Termination

To drive TI clock buffers with the LMK6Bx, refer to Clocking TI Clock Buffers with the LMK6Bx application note.