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

12 Device and Documentation Support

12.1 Device Support

12.1.1 Development Support

Texas Instruments has several software tools to aid in the development process including CodeLoder for programming, Clock Design Tool for Loop filter design and phase noise/spur simulation, and the Clock Architect. All these tools are available at www.ti.com.

12.2 Documentation Support

12.2.1 Related Documentation

For the avid reader, the following resources are available at www.ti.com.

Application Note 1879 -- Fractional N Frequency Synthesis

PLL Performance, Simulation, and Design -- by Dean Banerjee

12.3 Related Links

The table below lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy.

Table 10. Related Links

PARTS PRODUCT FOLDER SAMPLE and BUY TECHNICAL DOCUMENTS TOOLS and SOFTWARE SUPPORT and COMMUNITY
LMX2492 Click here Click here Click here Click here Click here
LMX2492-Q1 Click here Click here Click here Click here Click here

12.4 Community Resources

The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use.

    TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers.
    Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support.

12.5 Trademarks

E2E is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

12.6 Electrostatic Discharge Caution

esds-image

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

12.7 Glossary

SLYZ022 — TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.