SNAS236G October   2005  – January 2016 LMX2485 , LMX2485E

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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 Requirements
    7. 6.7 Typical Characteristics
      1. 6.7.1 Sensitivity
      2. 6.7.2 FinRF Input Impedance
      3. 6.7.3 FinIF Input Impedance
      4. 6.7.4 OSCin Input Impedance
      5. 6.7.5 Currents
  7. 7 Parameter Measurement Information
    1. 7.1 Bench Test Set-Ups
      1. 7.1.1 Charge Pump Current Measurement
      2. 7.1.2 Charge Pump Current Specification Definitions
        1. 7.1.2.1 Charge Pump Output Current Magnitude Variation vs Charge Pump Output Voltage
        2. 7.1.2.2 Charge Pump Sink Current vs Charge Pump Output Source Current Mismatch
        3. 7.1.2.3 Charge Pump Output Current Magnitude Variation vs Temperature
      3. 7.1.3 Sensitivity Measurement Procedure
      4. 7.1.4 Input Impedance Measurement
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 TCXO, Oscillator Buffer, and R Counter
      2. 8.3.2 Phase Detector
      3. 8.3.3 Charge Pump
      4. 8.3.4 Loop Filter
      5. 8.3.5 N Counters and High Frequency Input Pins
        1. 8.3.5.1 High Frequency Input Pins, FinRF and FinIF
        2. 8.3.5.2 Complementary High Frequency Pin, FinRF*
      6. 8.3.6 Digital Lock Detect Operation
      7. 8.3.7 Cycle Slip Reduction and Fastlock
        1. 8.3.7.1 Cycle Slip Reduction (CSR)
        2. 8.3.7.2 Fastlock
        3. 8.3.7.3 Using Cycle Slip Reduction (CSR) to Avoid Cycle Slipping
          1. 8.3.7.3.1 (Fastlock Charge Pump Current) / (Steady-State Charge Pump Current) = CSR
        4. 8.3.7.4 Using Fastlock to Improve Lock Times
        5. 8.3.7.5 Capacitor Dielectric Considerations for Lock Time
      8. 8.3.8 Fractional Spur and Phase Noise Controls
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power Pins, Power-Down, and Power-Up Modes
    5. 8.5 Programming
      1. 8.5.1 General Programming Information
        1. 8.5.1.1 Register Location Truth Table
        2. 8.5.1.2 Control Register Content Map
        3. 8.5.1.3 Quick Start Register Map
        4. 8.5.1.4 Complete Register Map
    6. 8.6 Register Maps
      1. 8.6.1 R0 Register
        1. 8.6.1.1 RF_FN[11:0]—Fractional Numerator for RF PLL
        2. 8.6.1.2 RF_N[10:0]—RF N Counter Value
      2. 8.6.2 R1 Register
        1. 8.6.2.1 RF_FD[11:0]—RF PLL Fractional Denominator
        2. 8.6.2.2 RF_R [5:0]—RF R Divider Value
        3. 8.6.2.3 RF_P—RF Prescaler Bit
        4. 8.6.2.4 RF_PD—RF Power-Down Control Bit
      3. 8.6.3 R2 Register
        1. 8.6.3.1 IF_N[18:0]—IF N Divider Value
        2. 8.6.3.2 IF_PD—IF Power Down Bit
      4. 8.6.4 R3 Register
        1. 8.6.4.1 IF_R[11:0]—IF R Divider Value
        2. 8.6.4.2 RF_CPG—RF PLL Charge Pump Gain
        3. 8.6.4.3 ACCESS—Register Access Word
      5. 8.6.5 R4 Register
        1. 8.6.5.1 MUX[3:0] Frequency Out and Lock Detect MUX
        2. 8.6.5.2 IF_P—IF Prescaler
        3. 8.6.5.3 RF_CPP—RF PLL Charge Pump Polarity
        4. 8.6.5.4 IF_CPP—IF PLL Charge Pump Polarity
        5. 8.6.5.5 OSC_OUT Oscillator Output Buffer Enable
        6. 8.6.5.6 OSC2X—Oscillator Doubler Enable
        7. 8.6.5.7 FM[1:0]—Fractional Mode
        8. 8.6.5.8 DITH[1:0]—Dithering Control
        9. 8.6.5.9 ATPU—PLL Automatic Power Up
      6. 8.6.6 R5 Register
        1. 8.6.6.1 Fractional Numerator Determination [ RF_FN[21:12], RF_FN[11:0], Access[1] ]
        2. 8.6.6.2 Fractional Denominator Determination [ RF_FD[21:12], RF_FD[11:0], Access[1]]
      7. 8.6.7 R6 Register
        1. 8.6.7.1 RF_TOC—RF Time Out Counter and Control for FLoutRF Pin
        2. 8.6.7.2 RF_CPF—RF PLL Fastlock Charge Pump Current
        3. 8.6.7.3 CSR[1:0]—RF Cycle Slip Reduction
      8. 8.6.8 R7 Register
        1. 8.6.8.1 DIV4—RF Digital Lock Detect Divide By 4
        2. 8.6.8.2 IF_RST—IF PLL Counter Reset
        3. 8.6.8.3 RF_RST—RF PLL Counter Reset
        4. 8.6.8.4 RF_TRI—RF Charge Pump Tri-State
        5. 8.6.8.5 IF_TRI—IF Charge Pump Tri-State
  9. 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 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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

11 Layout

11.1 Layout Guidelines

The critical pin is the high frequency input pin that should be short. In general, try to keep the ground and power planes 20 mils or further from vias to supply pins to ensure that no spur energy can couple to them.

11.2 Layout Example

LMX2485 LMX2485E pcb_snas236.gif Figure 27. Layout Example