JAJSDN8C March   2017  – April 2019 LMX2594

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      概略回路図
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Reference Oscillator Input
      2. 8.3.2  Reference Path
        1. 8.3.2.1 OSCin Doubler (OSC_2X)
        2. 8.3.2.2 Pre-R Divider (PLL_R_PRE)
        3. 8.3.2.3 Programmable Multiplier (MULT)
        4. 8.3.2.4 Post-R Divider (PLL_R)
        5. 8.3.2.5 State Machine Clock
      3. 8.3.3  PLL Phase Detector and Charge Pump
      4. 8.3.4  N-Divider and Fractional Circuitry
      5. 8.3.5  MUXout Pin
        1. 8.3.5.1 Lock Detect
        2. 8.3.5.2 Readback
      6. 8.3.6  VCO (Voltage-Controlled Oscillator)
        1. 8.3.6.1 VCO Calibration
        2. 8.3.6.2 Determining the VCO Gain
      7. 8.3.7  Channel Divider
      8. 8.3.8  Output Buffer
      9. 8.3.9  Power-Down Modes
      10. 8.3.10 Phase Synchronization
        1. 8.3.10.1 General Concept
        2. 8.3.10.2 Categories of Applications for SYNC
        3. 8.3.10.3 Procedure for Using SYNC
        4. 8.3.10.4 SYNC Input Pin
      11. 8.3.11 Phase Adjust
      12. 8.3.12 Fine Adjustments for Phase Adjust and Phase SYNC
      13. 8.3.13 Ramping Function
        1. 8.3.13.1 Manual Pin Ramping
          1. 8.3.13.1.1 Manual Pin Ramping Example
        2. 8.3.13.2 Automatic Ramping
          1. 8.3.13.2.1 Automatic Ramping Example (Triangle Wave)
      14. 8.3.14 SYSREF
        1. 8.3.14.1 Programmable Fields
        2. 8.3.14.2 Input and Output Pin Formats
          1. 8.3.14.2.1 Input Format for SYNC and SysRefReq Pins
          2. 8.3.14.2.2 SYSREF Output Format
        3. 8.3.14.3 Examples
        4. 8.3.14.4 SYSREF Procedure
      15. 8.3.15 SysRefReq Pin
    4. 8.4 Device Functional Modes
    5. 8.5 Programming
      1. 8.5.1 Recommended Initial Power-Up Sequence
      2. 8.5.2 Recommended Sequence for Changing Frequencies
      3. 8.5.3 General Programming Requirements
    6. 8.6 Register Maps
      1. 8.6.1  General Registers R0, R1, & R7
        1. Table 24. Field Descriptions
      2. 8.6.2  Input Path Registers
        1. Table 25. Field Descriptions
      3. 8.6.3  Charge Pump Registers (R13, R14)
        1. Table 26. Field Descriptions
      4. 8.6.4  VCO Calibration Registers
        1. Table 27. Field Descriptions
      5. 8.6.5  N Divider, MASH, and Output Registers
        1. Table 28. Field Descriptions
      6. 8.6.6  SYNC and SysRefReq Input Pin Register
        1. Table 29. Field Descriptions
      7. 8.6.7  Lock Detect Registers
        1. Table 30. Field Descriptions
      8. 8.6.8  MASH_RESET
        1. Table 31. Field Descriptions
      9. 8.6.9  SysREF Registers
        1. Table 32. Field Descriptions
      10. 8.6.10 CHANNEL Divider Registers
        1. Table 33. Field Descriptions
      11. 8.6.11 Ramping and Calibration Fields
        1. Table 34. Field Descriptions
      12. 8.6.12 Ramping Registers
        1. 8.6.12.1 Ramp Limits
          1. Table 35. Field Descriptions
        2. 8.6.12.2 Ramping Triggers, Burst Mode, and RAMP0_RST
          1. Table 36. Field Descriptions
        3. 8.6.12.3 Ramping Configuration
          1. Table 37. Field Descriptions
      13. 8.6.13 Readback Registers
        1. Table 38. Field Descriptions
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 OSCin Configuration
      2. 9.1.2 OSCin Slew Rate
      3. 9.1.3 RF Output Buffer Power Control
      4. 9.1.4 RF Output Buffer Pullup
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 デベロッパー・ネットワークの製品に関する免責事項
      2. 12.1.2 開発サポート
    2. 12.2 ドキュメントのサポート
      1. 12.2.1 関連資料
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 Glossary
  13. 13メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.3.11 Phase Adjust

The MASH_SEED word can use the sigma-delta modulator to shift output signal phase with respect to the input reference. If a SYNC pulse is sent (software or pin) or the MASH is reset with MASH_RST_N, then this phase shift is from the initial phase of zero. If the MASH_SEED word is written to, then this phase is added. Use Equation 5 to calculate the phase shift.

Equation 5. Phase shift in degrees = 360 × ( MASH_SEED / PLL_DEN) × ( IncludedDivide / CHDIV )

Example:

Mash seed = 1

Denominator = 12

Channel divider = 16

Phase shift (VCO_PHASE_SYNC = 0) = 360 × (1/12) × (1/16) = 1.875 degrees

Phase Shift (VCO_PHASE_SYNC = 1) = 360 × (1/12) × (4/16) = 7.5 degrees

There are several considerations with phase shift with MASH_SEED:

  • Phase shift can be done with a FRAC_NUM = 0, but MASH_ORDER must be greater than zero. For MASH_ORDER = 1, the phase shifting only occurs when MASH_SEED is a multiple of PLL_DEN.
  • For the phase adjust, the condition PLL_DEN > PLL_NUM + MASH_SEED must be satisfied.
  • When MASH_SEED and Phase SYNC are used together with IncludedDivide > 1, additional constraints may be necessary to produce a monotonic relationship between MASH_SEED and the phase shift, especially when the VCO frequency is below 10 GHz. These constraints are application specific, but some general guidelines are to reduce modulator order and increase the N divider. One possible guideline is for PLL_N ≥ 45 (2nd order modulator), PLL_N ≥ 49 (3rd Order modulator), PLL_N ≥ 54 (4th Order Modulator).