Alternative Parts


Features and Benefits

  • Ultrawideband frequency range: 9 kHz to 40 GHz
  • Attenuation range: 2 dB steps to 30 dB
  • Low insertion loss
    • 1.6 dB to 18 GHz
    • 2.0 dB to 26 GHz
    • 3.4 dB to 40 GHz
  • Attenuation accuracy
    • ±(0.1 + 1.0%) of attenuation state up to 18 GHz
    • ±(0.1 + 2.5%) of attenuation state up to 26 GHz
    • ±(0.6 + 10.0%) of attenuation state up to 40 GHz
  • Typical step error
    • ±0.15 dB to 18 GHz
    • ±0.20 dB to 26 GHz
    • ±0.60 dB to 40 GHz
  • High input linearity
    • P0.1dB insertion loss state: 30 dBm
    • P0.1dB other attenuation states: 26 dBm
    • IP3: 50 dBm typical
  • High RF input power handling: 26 dBm average, 30 dBm peak
  • Tight distribution in relative phase
  • No low frequency switching spurs
  • SPI and parallel mode control, CMOS/LVTTL compatible
  • RF amplitude settling time (0.1 dB of final RF output): 8.5 μs
  • 2.5 mm × 2.5 mm, 16-terminal LGA package
  • Pin compatible with ADRF5731, fast switching version

Product Details

The ADRF5721 is a silicon, 4-bit digital attenuator with a 30 dB attenuation control range in 2 dB steps.

This device operates from 9 kHz to 40 GHz with better than 3.4 dB of insertion loss. The ATTIN port of the ADRF5721 has a radio frequency (RF) input power handling capability of 26 dBm average and 30 dBm peak for all states.

The ADRF5721 requires a dual supply voltage of +3.3 V and −3.3 V. The device features serial peripheral interface (SPI), parallel mode control, and complementary metal-oxide semiconductor (CMOS)-/low voltage transistor to transistor logic (LVTTL)-compatible controls.

The ADRF5721 is pin compatible with the ADRF5731, the fast switching version, which operates from 100 MHz to 40 GHz.

The ADRF5721 RF ports are designed to match a characteristic impedance of 50 Ω.

The ADRF5721 comes in a 16-terminal, 2.5 mm × 2.5 mm, RoHS compliant, land grid array (LGA) package and operates from −40°C to +105°C.


  • Industrial scanners
  • Test and instrumentation
  • Cellular infrastructure: 5G millimeter wave
  • Military radios, radars, electronic counter measures (ECMs)
  • Microwave radios and very small aperture terminals (VSATs)

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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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.