SCAS844G August   2007  – January 2024 CDCE949 , CDCEL949

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 EEPROM Specification
    7. 5.7 Timing Requirements: CLK_IN
    8. 5.8 Timing Requirements: SDA/SCL
    9. 5.9 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Control Terminal Setting
      2. 7.3.2 Default Device Setting
      3. 7.3.3 SDA/SCL Serial Interface
      4. 7.3.4 Data Protocol
    4. 7.4 Device Functional Modes
      1. 7.4.1 SDA/SCL Hardware Interface
    5. 7.5 Programming
  9. 8 Application 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
        1. 8.2.2.1 Spread Spectrum Clock (SSC)
        2. 8.2.2.2 PLL Frequency Planning
        3. 8.2.2.3 Crystal Oscillator Start-Up
        4. 8.2.2.4 Frequency Adjustment With Crystal Oscillator Pulling
        5. 8.2.2.5 Unused Inputs and Outputs
        6. 8.2.2.6 Switching Between XO and VCXO Mode
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Register Maps
    1. 9.1 SDA/SCL Configuration Registers
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
    2. 10.2 Related Documentation
    3. 10.3 Related Links
    4. 10.4 Receiving Notification of Documentation Updates
    5. 10.5 Support Resources
    6. 10.6 Trademarks
    7. 10.7 Electrostatic Discharge Caution
    8. 10.8 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • Member of programmable clock generator family
    • CDCEx913: 1 PLLs, 3 outputs
    • CDCEx925: 2 PLLs, 5 outputs
    • CDCEx937: 3 PLLs, 7 outputs
    • CDCEx949: 4 PLLs, 9 outputs
  • In-System programmability and EEPROM
    • Serial programmable volatile register
    • Nonvolatile EEPROM to store customer settings
  • Flexible input clocking concept
    • External crystal: 8MHz to 32MHz
    • On-chip VCXO pull-range: ±150ppm
    • Single-ended LVCMOS up to 160MHz
  • Free selectable output frequency up to 230MHz
  • Low-noise PLL core
    • PLL loop filter components integrated
    • Low period jitter: 60ps (typical)
  • Separate output supply pins
    • CDCE949: 3.3V and 2.5V
    • CDCEL949: 1.8V
  • Flexible clock driver
    • Three user-definable control inputs [S0/S1/S2] (for example: SSC selection, frequency switching, output enable or power down)
    • Generates highly accurate clocks for video, audio, USB, IEEE1394, RFID, Bluetooth®, WLAN, Ethernet™, and GPS
    • Generates common clock frequencies used with TI-DaVinci™, OMAP™, DSPs
    • Programmable SSC modulation
    • Enables 0ppm clock generation
  • 1.8V device core supply
  • Wide temperature range: –40°C to 85°C
  • Packaged in TSSOP
  • Development and programming kit for easy PLL design and programming (TI Pro-Clock™)