SNAS722A December   2017  – October 2018 LMK61E07


  1. Features
  2. Applications
  3. Description
    1.     Pinout and Simplified Block Diagram
      1.      Device Images
  4. Revision History
  5. Pin Configuration and Functions
    1.     Pin Functions
  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 - Power Supply
    6. 6.6  LVPECL Output Characteristics
    7. 6.7  LVDS Output Characteristics
    8. 6.8  HCSL Output Characteristics
    9. 6.9  Frequency Tolerance Characteristics
    10. 6.10 Frequency Margining Characteristics
    11. 6.11 Power-On Reset Characteristics (VDD)
    12. 6.12 I2C-Compatible Interface Characteristics (SDA, SCL)
    13. 6.13 PSRR Characteristics
    14. 6.14 Other Characteristics
    15. 6.15 PLL Clock Output Jitter Characteristics
    16. 6.16 Typical 156.25-MHz Output Phase Noise Characteristics
    17. 6.17 Typical 161.1328125 MHz Output Phase Noise Characteristics
    18. 6.18 Additional Reliability and Qualification
    19. 6.19 Typical Characteristics
  7. Parameter Measurement Information
    1. 7.1 Device Output Configurations
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Device Block-Level Description
      2. 8.3.2  Device Configuration Control
      3. 8.3.3  Register File Reference Convention
      4. 8.3.4  Configuring the PLL
      5. 8.3.5  Integrated Oscillator
      6. 8.3.6  Reference Divider and Doubler
      7. 8.3.7  Phase Frequency Detector
      8. 8.3.8  Feedback Divider (N)
      9. 8.3.9  Fractional Engine
      10. 8.3.10 Charge Pump
      11. 8.3.11 Loop Filter
      12. 8.3.12 VCO Calibration
      13. 8.3.13 High-Speed Output Divider
      14. 8.3.14 High-Speed Clock Output
      15. 8.3.15 Device Status
        1. Loss of Lock
    4. 8.4 Device Functional Modes
      1. 8.4.1 Interface and Control
      2. 8.4.2 DCXO Mode and Frequency Margining
        1. DCXO Mode
        2. Fine Frequency Margining
        3. Coarse Frequency Margining
    5. 8.5 Programming
      1. 8.5.1 I2C Serial Interface
      2. 8.5.2 Block Register Write
      3. 8.5.3 Block Register Read
      4. 8.5.4 Write SRAM
      5. 8.5.5 Write EEPROM
      6. 8.5.6 Read SRAM
      7. 8.5.7 Read EEPROM
    6. 8.6 Register Maps
      1. 8.6.1 Register Descriptions
        1.  VNDRID_BY1 Register; R0
        2.  VNDRID_BY0 Register; R1
        3.  PRODID Register; R2
        4.  REVID Register; R3
        5.  SLAVEADR Register; R8
        6.  EEREV Register; R9
        7.  DEV_CTL Register; R10
        8.  XO_CAPCTRL_BY1 Register; R16
        9.  XO_CAPCTRL_BY0 Register; R17
        10. DIFFCTL Register; R21
        11. OUTDIV_BY1 Register; R22
        12. OUTDIV_BY0 Register; R23
        13. RDIVCMOSCTL Register; R24
        14. PLL_NDIV_BY1 Register; R25
        15. PLL_NDIV_BY0 Register; R26
        16. PLL_FRACNUM_BY2 Register; R27
        17. PLL_FRACNUM_BY1 Register; R28
        18. PLL_FRACNUM_BY0 Register; R29
        19. PLL_FRACDEN_BY2 Register; R30
        20. PLL_FRACDEN_BY1 Register; R31
        21. PLL_FRACDEN_BY0 Register; R32
        22. PLL_MASHCTRL Register; R33
        23. PLL_CTRL0 Register; R34
        24. PLL_CTRL1 Register; R35
        25. PLL_LF_R2 Register; R36
        26. PLL_LF_C1 Register; R37
        27. PLL_LF_R3 Register; R38
        28. PLL_LF_C3 Register; R39
        29. PLL_CALCTRL Register; R42
        30. NVMSCRC Register; R47
        31. NVMCNT Register; R48
        32. NVMCTL Register; R49
        33. MEMADR Register; R51
        34. NVMDAT Register; R52
        35. RAMDAT Register; R53
        36. NVMUNLK Register; R56
        37. INT_LIVE Register; R66
        38. SWRST Register; R72
  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
        1. PLL Loop Filter Design
        2. Spur Mitigation Techniques
          1. Phase Detection Spur
          2. Integer Boundary Fractional Spur
          3. Primary Fractional Spur
          4. Sub-Fractional Spur
        3. Device Programming
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Ensured Thermal Reliability
      2. 11.1.2 Best Practices for Signal Integrity
      3. 11.1.3 Recommended Solder Reflow Profile
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • SIA|6
Thermal pad, mechanical data (Package|Pins)
Orderable Information

I2C Serial Interface

The I2C port on the LMK61E07 works as a slave device and supports both the 100-kHz standard mode and 1-MHz fast mode operations. Fast mode imposes a glitch tolerance requirement on the control signals. Therefore, the input receivers ignore pulses of less than 50-ns duration. The I2C timing is given in I2C-Compatible Interface Characteristics (SDA, SCL). The timing diagram is given in Figure 28.

LMK61E07 i2c_timing_diagram_snas674.gifFigure 28. I2C Timing Diagram

In an I2C bus system, the LMK61E07 acts as a slave device and is connected to the serial bus (data bus SDA and lock bus SCL). These are accessed through a 7-bit slave address transmitted as part of an I2C packet. Only the device with a matching slave address responds to subsequent I2C commands. The device slave address is 1011001 or 0x59.

During the data transfer through the I2C interface, one clock pulse is generated for each data bit transferred. The data on the SDA line must be stable during the high period of the clock. The high or low state of the data line can change only when the clock signal on the SCL line is low. The start data transfer condition is characterized by a high-to-low transition on the SDA line while SCL is high. The stop data transfer condition is characterized by a low-to-high transition on the SDA line while SCL is high. The start and stop conditions are always initiated by the master. Every byte on the SDA line must be eight bits long. Each byte must be followed by an acknowledge bit and bytes are sent MSB first. The I2C register structure of the LMK61E07 is shown in Figure 29.

LMK61E07 i2c_register_structure_snas674.gifFigure 29. I2C Register Structure

The acknowledge bit (A) or non-acknowledge bit (A’) is the 9th bit attached to any 8-bit data byte and is always generated by the receiver to inform the transmitter that the byte has been received (when A = 0) or not (when A’ = 0). A = 0 is done by pulling the SDA line low during the 9th clock pulse and A’ = 0 is done by leaving the SDA line high during the 9th clock pulse.

The I2C master initiates the data transfer by asserting a start condition which initiates a response from all slave devices connected to the serial bus. Based on the 8-bit address byte sent by the master over the SDA line (consisting of the 7-bit slave address (MSB first) and an R/W’ bit), the device whose address corresponds to the transmitted address responds by sending an acknowledge bit. All other devices on the bus remain idle while the selected device waits for data transfer with the master.

After the data transfer has occurred, stop conditions are established. In write mode, the master asserts a stop condition to end data transfer during the 10th clock pulse following the acknowledge bit for the last data byte from the slave. In read mode, the master receives the last data byte from the slave but does not pull SDA low during the 9th clock pulse. This is known as a non-acknowledge bit. By receiving the non-acknowledge bit, the slave knows the data transfer is finished and enters the idle mode. The master then takes the data line low during the low period before the 10th clock pulse, and high during the 10th clock pulse to assert a stop condition. A generic transaction is shown in Figure 30.

LMK61E07 generic_programming_sequence_snas674.gifFigure 30. Generic Programming Sequence

The LMK61E07 I2C interface supports Block Register Write/Read, Read/Write SRAM, and Read/Write EEPROM operations. For Block Register Write/Read operations, the I2C master can individually access addressed registers that are made of an 8-bit data byte.