SNAS711A October   2016  – January 2017 LMX2491

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 Storage Conditions
    3. 6.3 ESD Ratings
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Thermal Information
    6. 6.6 Electrical Characteristics
    7. 6.7 Timing Requirements, Programming Interface (CLK, DATA, LE)
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  OSCin Input
      2. 7.3.2  OSCin Doubler
      3. 7.3.3  R Divider
      4. 7.3.4  PLL N Divider
      5. 7.3.5  Fractional Circuitry
      6. 7.3.6  PLL Phase Detector and Charge Pump
      7. 7.3.7  External Loop Filter
      8. 7.3.8  Fastlock and Cycle Slip Reduction
      9. 7.3.9  Lock Detect and Charge Pump Voltage Monitor
        1. 7.3.9.1 Charge Pump Voltage Monitor
        2. 7.3.9.2 Digital Lock Detect
      10. 7.3.10 FSK/PSK Modulation
      11. 7.3.11 Ramping Functions
        1. 7.3.11.1 Ramp Count
        2. 7.3.11.2 Ramp Comparators and Ramp Limits
      12. 7.3.12 Power-on-reset (POR)
      13. 7.3.13 Register Readback
    4. 7.4 Device Functional Modes
      1. 7.4.1 Continuous Frequency Generator
        1. 7.4.1.1 Integer Mode Operation
        2. 7.4.1.2 Fractional Mode Operation
      2. 7.4.2 Modulated Waveform Generator
    5. 7.5 Programming
      1. 7.5.1 Loading Registers
    6. 7.6 Register Maps
      1. 7.6.1 Register Field Descriptions
        1. 7.6.1.1 POWERDOWN and Reset Fields
        2. 7.6.1.2 Dividers and Fractional Controls
          1. 7.6.1.2.1 Speed Up Controls (Cycle Slip Reduction and Fastlock)
      2. 7.6.2 Lock Detect and Charge Pump Monitoring
      3. 7.6.3 TRIG1, TRIG2, MOD, and MUXout Pins
      4. 7.6.4 Ramping Functions
      5. 7.6.5 Individual Ramp Controls
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1  Design Requirements
      2. 8.2.2  Detailed Design Procedure
      3. 8.2.3  TICS Pro Basic Setup
      4. 8.2.4  Frequency Shift Keying Example
      5. 8.2.5  Single Sawtooth Ramp Example
      6. 8.2.6  Continuous Sawtooth Ramp Example
      7. 8.2.7  Continuous Sawtooth Ramp with FSK Example
      8. 8.2.8  Continuous Triangular Ramp Example
      9. 8.2.9  Continuous Trapezoid Ramp Example
      10. 8.2.10 Arbitrary Waveform Ramp Example
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

4 Revision History

Changes from * Revision (October 2016) to A Revision

  • Deleted Charge pump output pin from the table Go
  • Changed to Supply voltage Go
  • Changed to I/O input voltage Go
  • Changed to Power down current Go
  • Changed DATA field bit descriptionGo
  • Added new plots in Typical CharacteristicsGo
  • Changed Table 1 titleGo
  • Added CMP0 and CMP1 definition. Changed Equation 1 description.Go
  • Added Register Readback Go
  • Added MSB bit description Go
  • Changed the format in Window and fPD Frequency column Go
  • Changed to correct register bits location Go
  • Changed to correct value Go
  • Added correct start time Go
  • Added design details and plots in Typical Application Go