Overview

Features and Benefits

  • ±1dB Output Power Variation
  • +14dBm to +20dBm Adjustable Output Power
  • 40dB Reverse Isolation
  • Better Than 35dB Main Driver Output to PLL Amp Output Isolation
  • Low Output Noise: -170dBc/Hz at +17dBm
  • 110mA Supply Current at +17dBm
  • ESD Protection
  • Isolated PLL Output (+3dBm)
  • Product Details

    The MAX9989 and MAX9990 LO buffers provide the high output (+14dBm to +20dBm) necessary to drive the LO inputs of high-linearity passive mixers, while offering 40dB reverse isolation to prevent LO pulling. The MAX9989 is internally matched for the cellular/GSM bands, and the MAX9990 is matched for the DCS/PCS/UMTS bands.

    The Typical Application Circuit provides a nominal +17dBm output power with ±1dB variation over supply, temperature, and input power. With two optional resistors, the output power can be precision set from +14dBm to +20dBm. The devices offer more than 35dB main driver output to PLL amp output isolation. Each device is offered in a 5mm x 5mm 20-pin thin QFN package with exposed paddle.

    Applications

    • Cellular/GSM/DCS/PCS/UMTS Base Station Tx/Rx LO Drive
    • Coherent Receivers
    • ISM Wireless LAN
    • Local Multipoint Distribution Service
    • Point-to-Point Systems
    • Wireless Local Loop (WLL)

    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

    MAX9989 Companion Parts

    Recommended Related Parts

    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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