SNAS624B March   2014  – May 2015 LMX2492 , LMX2492-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2  Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Storage Conditions
    3. 7.3 ESD Ratings
    4. 7.4 Recommended Operating Conditions
    5. 7.5 Thermal Information
    6. 7.6 Electrical Characteristics
    7. 7.7 Timing Requirements, Programming Interface (CLK, DATA, LE)
    8. 7.8 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  OSCin Input
      2. 8.3.2  OSCin Doubler
      3. 8.3.3  R Divider
      4. 8.3.4  PLL N Divider
      5. 8.3.5  Fractional Circuitry
      6. 8.3.6  PLL Phase Detector and Charge Pump
      7. 8.3.7  External Loop Filter
      8. 8.3.8  Fastlock and Cycle Slip Reduction
      9. 8.3.9  Lock Detect and Charge Pump Voltage Monitor
        1. 8.3.9.1 Charge Pump Voltage Monitor
        2. 8.3.9.2 Digital Lock Detect
      10. 8.3.10 FSK/PSK Modulation
      11. 8.3.11 Ramping Functions
        1. 8.3.11.1 Ramp Count
        2. 8.3.11.2 Ramp Comparators and Ramp Limits
      12. 8.3.12 Power on Reset (POR)
    4. 8.4  Device Functional Modes
      1. 8.4.1 Continuous Frequency Generator
        1. 8.4.1.1 Integer Mode Operation
        2. 8.4.1.2 Fractional Mode Operation
      2. 8.4.2 Modulated Waveform Generator
    5. 8.5  Programming
      1. 8.5.1 Loading Registers
    6. 8.6  Register Map
    7. 8.7  Register Field Descriptions
      1. 8.7.1 POWERDOWN and Reset Fields
      2. 8.7.2 Dividers and Fractional Controls
        1. 8.7.2.1 Speed Up Controls (Cycle Slip Reduction and Fastlock)
    8. 8.8  Lock Detect and Charge Pump Monitoring
    9. 8.9  TRIG1,TRIG2,MOD, and MUXout Pins
    10. 8.10 Ramping Functions
    11. 8.11 Individual Ramp Controls
  9. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Performance Plot - Sawtooth Waveform Example
      4. 9.2.4 Application Performance Plot - Flat Top Triangle Waveform
      5. 9.2.5 Applications Performance Plot -- Complex Triggered Ramp
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Related Links
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

10 Power Supply Recommendations

For power supplies, it is recommended to place 100 nF close to each of the power supply pins. If fractional spurs are a large concern, using a ferrite bead to each of these power supply pins can reduce spurs to a small degree.