Silicon Laboratories SI5351A/B/C User Manuals

Table of Contents

• 1. Electrical Specifications

  4
• 2. Detailed Block Diagrams

  9
• 3. Functional Description

  11
  • 3.1. Input Stage

    11
    • 3.1.1. Crystal Inputs (XA, XB)

      11
    • 3.1.2. External Clock Input (CLKIN)

      12
    • 3.1.3. Voltage Control Input (VC)

      12
  • 3.2. Synthesis Stages

    12
  • 3.3. Output Stage

    12
  • 3.4. Spread Spectrum

    13
  • 3.5. Control Pins (OEB, SSEN)

    13
    • 3.5.1. Output Enable (OEB)

      13
    • 3.5.2. Spread Spectrum Enable (SSEN)—Si5351A and Si5351B only

      13
• 4. I2C Interface

  14
• 5. Configuring the Si5351

  16
  • 5.1. Writing a Custom Configuration to RAM

    16
  • 5.2. Si5351 Application Examples

    18
  • 5.3. Replacing Crystals and Crystal Oscillators

    18
  • 5.4. Replacing Crystals, Crystal Oscillators, and VCXOs

    19
  • 5.5. Replacing Crystals, Crystal Oscillators, and PLLs

    19
  • 5.6. Replacing a Crystal with a Clock

    20
  • 5.7. HCSL Compatible Outputs

    20
• 6. Design Considerations

  21
  • 6.1. Power Supply Decoupling/Filtering

    21
  • 6.2. Power Supply Sequencing

    21
  • 6.3. External Crystal

    21
  • 6.4. External Crystal Load Capacitors

    21
  • 6.5. Unused Pins

    21
  • 6.6. Trace Characteristics

    22
• 7. Register Map Summary

  23
• 8. Register Descriptions

  25
• 9. Si5351A Pin Descriptions (20-Pin QFN, 24-Pin QSOP)

  62
• 10. Si5351B Pin Descriptions (20-Pin QFN, 24-Pin QSOP)

  63
• 11. Si5351C Pin Descriptions (20-Pin QFN, 24-Pin QSOP)

  64
• 12. Si5351A Pin Descriptions (10-Pin MSOP)

  65
• 13. Ordering Information

  66
• 14. Package Outline (24-Pin QSOP)

  67
• 15. Package Outline (20-Pin QFN)

  68
• 16. Package Outline (10-Pin MSOP)

  69
• Document Change List

  70
• Contact Information

  72