Features and Benefits

  • AISG v3.0 Compliant
  • Fully Integrated Modem with 4:1 Multiplexer Facilitates Connectivity Between 1 Modem and Up to 4 Ports
  • Receiver Wide Input Dynamic Range
    • -23dBm to +5dBm into 50Ω
  • Adjustable Receiver Sensitivity Threshold from -20.5dBm to -15dBm
  • Adjustable Transmitter Output Level from -0.5dBm to +7.0dBm into 50Ω
  • AISG v3.0/v2.0 Compliant Output Emission Profile
  • Autodirection Output
  • No Need of Microcontrollers to Handle Bus Arbitration in Tower-Mounted Equipment
  • Support All AISG v2.0 Data Rates
    • 9.6kbps (default) for AISG v3.0
    • 38.4kbps and 115.2kbps for Backward Compatibility
  • Bandpass Filter Compliant with AISG v3.0 Protocol Centered on 2.176MHz
  • 3.0V to 5.5V Voltage Supply
  • Independent Logic Supply
  • Small, 4mm x 4mm 20-Pin TQFN Package

Product Details

The MAX11947 is an AISG v2.0 and v3.0-compliant, fully integrated modem with a 4:1 multiplexer facilitating connectivity between a single modem and up to four RF ports. The MAX11947 receiver offers a typical dynamic range of 20dB and integrates a bandpass filter that operates at the 2.176MHz carrier frequency with a narrow 200kHz bandwidth and is fully compliant with the AISG spectral emission profile. It can modulate OOK signals at the required 9.6kbps and up to 115.2kbps for back compatibility with the older AISG standard. The output power can be varied with an internal register setting from under 0dBm to over +6dBm in order to compensate for loss in the external circuitry and cabling. The receiver sensitivity threshold is also adjustable from the default -15dBm down to less than -20dBm to accommodate power loss through an external splitter. The MAX11947 also features a direction output to facilitate the RS-485 bus arbitration in tower-mounted equipment. The MAX11947 is available in a small, 4mm x 4mm 20-pin TQFN and is rated for operation in the -40°C to +105°C temperature range.


  • (SALD and MALD)
  • 2MHz OOK Modem Applications
  • Aenna Arrays
  • Antenna Line Devices (ALDs)
  • Base Station Single and Multi-Primary Controllers
  • RS485 Half-Duplex Coaxial Links
  • Smart Bias-Ts
  • Tower-Mounted Amplifiers (TMAs)

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.

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MAX11947 Companion Parts

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.