Features and Benefits

  • 5MHz to 35MHz for Crystal-Clock Reference
  • 5MHz to 50MHz for a Driver Clock Reference
  • One Fractional-N PLL with Buffered Output
  • 4MHz to 200MHz Output Frequency Range
  • Low RMS Jitter PLL (< 13ps) at 197 MHz
  • Integrated VCXO with ±200ppm Tuning Range
  • Available in 14-Pin TSSOP and 20-Pin TQFN Packages
  • +3.3V Supply
  • -40°C to +85°C Temperature Range
  • Product Details

    The MAX9491 multipurpose clock generator is ideal for communication applications. It offers a factory-programmable PLL output that can be set to almost any frequency, ranging from 4MHz to 200MHz. The MAX9491 uses a one-time-programmable (OTP) ROM to program the PLL output. The MAX9491 also features an integrated voltage-controlled crystal oscillator (VCXO) that is tuned by a DC voltage. The VCXO output is used as the PLL input. The VCXO has a wide ±200ppm (typ) tuning range. The OTP on the MAX9491 is factory preset, based upon the customer request. Contact the factory for samples with preferred frequencies.

    The device operates from a 3.3V supply and is specified over the -40°C to +85°C extended temperature range. The MAX9491 is available in 14-pin TSSOP and 20-pin TQFN (5mm x 5mm) packages.


    • Data Networking Systems
    • Home Entertainment Centers
    • SOHO
    • Telecommunications

    Product Lifecycle icon-recommended Production

    At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

    Product Recommendations

    MAX9491 Companion Parts

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    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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