SNAS816C March   2022  – February 2025 LMK5B33216

PRODUCTION DATA  

  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 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Diagrams
    7. 6.7 Typical Characteristics
  8. 7 Parameter Measurement Information
    1. 7.1 Differential Voltage Measurement Terminology
    2. 7.2 Output Clock Test Configurations
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
      1. 8.2.1 PLL Architecture Overview
      2. 8.2.2 DPLL
        1. 8.2.2.1 Independent DPLL Operation
        2. 8.2.2.2 Cascaded DPLL Operation
        3. 8.2.2.3 APLL Cascaded With DPLL
      3. 8.2.3 APLL-Only Mode
    3. 8.3 Feature Description
      1. 8.3.1  Oscillator Input (XO)
      2. 8.3.2  Reference Inputs
      3. 8.3.3  Clock Input Interfacing and Termination
      4. 8.3.4  Reference Input Mux Selection
        1. 8.3.4.1 Automatic Input Selection
        2. 8.3.4.2 Manual Input Selection
      5. 8.3.5  Hitless Switching
        1. 8.3.5.1 Hitless Switching With Phase Cancellation
        2. 8.3.5.2 Hitless Switching With Phase Slew Control
        3. 8.3.5.3 Hitless Switching With 1PPS Inputs
      6. 8.3.6  Gapped Clock Support on Reference Inputs
      7. 8.3.7  Input Clock and PLL Monitoring, Status, and Interrupts
        1. 8.3.7.1 XO Input Monitoring
        2. 8.3.7.2 Reference Input Monitoring
          1. 8.3.7.2.1 Reference Validation Timer
          2. 8.3.7.2.2 Frequency Monitoring
          3. 8.3.7.2.3 Missing Pulse Monitor (Late Detect)
          4. 8.3.7.2.4 Runt Pulse Monitor (Early Detect)
          5. 8.3.7.2.5 Phase Valid Monitor for 1PPS Inputs
        3. 8.3.7.3 PLL Lock Detectors
        4. 8.3.7.4 Tuning Word History
        5. 8.3.7.5 Status Outputs
        6. 8.3.7.6 Interrupt
      8. 8.3.8  PLL Relationships
        1. 8.3.8.1  PLL Frequency Relationships
          1. 8.3.8.1.1 APLL Phase Frequency Detector (PFD) and Charge Pump
          2. 8.3.8.1.2 APLL VCO Frequency
          3. 8.3.8.1.3 DPLL TDC Frequency
          4. 8.3.8.1.4 DPLL VCO Frequency
          5. 8.3.8.1.5 Clock Output Frequency
        2. 8.3.8.2  Analog PLLs (APLL1, APLL2, APLL3)
        3. 8.3.8.3  APLL Reference Paths
          1. 8.3.8.3.1 APLL XO Doubler
          2. 8.3.8.3.2 APLL XO Reference (R) Divider
        4. 8.3.8.4  APLL Feedback Divider Paths
          1. 8.3.8.4.1 APLL N Divider With Sigma-Delta Modulator (SDM)
        5. 8.3.8.5  APLL Loop Filters (LF1, LF2, LF3)
        6. 8.3.8.6  APLL Voltage-Controlled Oscillators (VCO1, VCO2, VCO3)
          1. 8.3.8.6.1 VCO Calibration
        7. 8.3.8.7  APLL VCO Clock Distribution Paths
        8. 8.3.8.8  DPLL Reference (R) Divider Paths
        9. 8.3.8.9  DPLL Time-to-Digital Converter (TDC)
        10. 8.3.8.10 DPLL Loop Filter (DLF)
        11. 8.3.8.11 DPLL Feedback (FB) Divider Path
      9. 8.3.9  Output Clock Distribution
      10. 8.3.10 Output Source Muxes
      11. 8.3.11 Output Channel Muxes
      12. 8.3.12 Output Dividers (OD)
      13. 8.3.13 SYSREF/1PPS Output
      14. 8.3.14 Output Delay
      15. 8.3.15 Clock Output Drivers
        1. 8.3.15.1 Differential Output
        2. 8.3.15.2 LVCMOS Output
      16. 8.3.16 Clock Output Interfacing and Termination
      17. 8.3.17 Glitchless Output Clock Start-Up
      18. 8.3.18 Output Auto-Mute During LOL
      19. 8.3.19 Output Synchronization (SYNC)
      20. 8.3.20 Zero-Delay Mode (ZDM)
      21. 8.3.21 DPLL Programmable Phase Delay
      22. 8.3.22 Time Elapsed Counter (TEC)
        1. 8.3.22.1 Configuring TEC Functionality
        2. 8.3.22.2 SPI as a Trigger Source
        3. 8.3.22.3 GPIO Pin as a TEC Trigger Source
          1. 8.3.22.3.1 An Example: Making a Time Elapsed Measurement Using TEC and GPIO1 as Trigger
        4. 8.3.22.4 TEC Timing
        5. 8.3.22.5 Other TEC Behavior
    4. 8.4 Device Functional Modes
      1. 8.4.1 DPLL Operating States
        1. 8.4.1.1 Free-Run
        2. 8.4.1.2 Lock Acquisition
        3. 8.4.1.3 DPLL Locked
        4. 8.4.1.4 Holdover
      2. 8.4.2 Digitally-Controlled Oscillator (DCO) Frequency and Phase Adjustment
        1. 8.4.2.1 DPLL DCO Control
        2. 8.4.2.2 DPLL DCO Relative Adjustment Frequency Step Size
        3. 8.4.2.3 APLL DCO Frequency Step Size
      3. 8.4.3 APLL Frequency Control
      4. 8.4.4 Device Start-Up
        1. 8.4.4.1 Device Power-On Reset (POR)
        2. 8.4.4.2 PLL Start-Up Sequence
        3. 8.4.4.3 Start-Up Options for Register Configuration
        4. 8.4.4.4 GPIO1 and SCS_ADD Functionalities
        5. 8.4.4.5 ROM Page Selection
        6. 8.4.4.6 ROM Detailed Description
        7. 8.4.4.7 EEPROM Overlay
    5. 8.5 Programming
      1. 8.5.1 Memory Overview
      2. 8.5.2 Interface and Control
        1. 8.5.2.1 Programming Through TICS Pro
        2. 8.5.2.2 SPI Serial Interface
        3. 8.5.2.3 I2C Serial Interface
      3. 8.5.3 General Register Programming Sequence
      4. 8.5.4 Steps to Program the EEPROM
        1. 8.5.4.1 Overview of the SRAM Programming Methods
        2. 8.5.4.2 EEPROM Programming With the Register Commit Method
        3. 8.5.4.3 EEPROM Programming With the Direct Writes Method or Mixed Method
        4. 8.5.4.4 Five MSBs of the I2C Address and the EEPROM Revision Number
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Device Start-Up Sequence
      2. 9.1.2 Power Down (PD#) Pin
      3. 9.1.3 Strap Pins for Start-Up
      4. 9.1.4 Pin States
      5. 9.1.5 ROM and EEPROM
      6. 9.1.6 Power Rail Sequencing, Power Supply Ramp Rate, and Mixing Supply Domains
        1. 9.1.6.1 Power-On Reset (POR) Circuit
        2. 9.1.6.2 Power Up From a Single-Supply Rail
        3. 9.1.6.3 Power Up From Split-Supply Rails
        4. 9.1.6.4 Non-Monotonic or Slow Power-Up Supply Ramp
      7. 9.1.7 Slow or Delayed XO Start-Up
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 Best Design Practices
    4. 9.4 Power Supply Recommendations
      1. 9.4.1 Power Supply Bypassing
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
      2. 9.5.2 Layout Example
      3. 9.5.3 Thermal Reliability
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
        1. 10.1.1.1 Clock Tree Architect Programming Software
        2. 10.1.1.2 Texas Instruments Clocks and Synthesizers (TICS) Pro Software
        3. 10.1.1.3 PLLatinum™ Simulation Tool
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.3 APLL-Only Mode

In APLL-only mode, the external XO input source determines the free-run frequency stability and accuracy of the output clocks. The DPLL blocks are not used and do not affect the APLLs. The APLLs can operate in cascaded mode or independent mode. DCO for each APLL is available through control register writes.

The principle of operation for APLL-only mode after power-on reset and initialization is as follows. If APLL1 or APLL2 is in cascaded mode as shown in Figure 8-6 (DPLL3 also is not used), VCO1 or VCO2 tracks the VCBO domain. APLLs lock in APLL priority order using bits: APLLx_STRT_PRTY. Cascading APLL1 or APLL2 from VCBO provides a high-frequency, ultra-low-jitter reference clock to minimize the in-band phase noise/jitter degradation that can otherwise occur from a lower performance XO/TCXO/OCXO.

If APLL1 or APLL2 is not cascaded as shown in Figure 8-7, VCO1 or VCO2 locks to the XO input in APLLx_STRT_PRTY order after initialization and operate independent of the BAW APLL domain.

When operating in APLL-Only mode without DPLL control, select the programmable 24-bit denominator (PLLx_MODE = 0) instead of a fixed 40-bit denominator (PLLx_MODE = 1) to synthesize exact frequency ratios and maintain 0ppm frequency error.

LMK5B33216 APLL-Only Independent Mode Figure 8-7 APLL-Only Independent Mode