New Silicon Digital Attenuator operates from 9 kHz to 40 GHz with excellent attenuation accuracy

    Analog Devices Inc. ADRF5720 is a silicon, 6-bit digital attenuator with 31.5 dB attenuation control range in 0.5 dB steps. This device operates from 9 kHz to 40 GHz with better than 4.5 dB of insertion loss and excellent attenuation accuracy. The ATTIN port of the ADRF5720 has a radio frequency (RF) input power handling capability of 27 dBm average and 30 dBm peak for all states. The ADRF5720 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 ADRF5720 is pin-compatible with the ADRF5730, the fast switching version, which operates from 100 MHz to 40 GHz. The ADRF5720 RF ports are designed to match a characteristic impedance of 50 Ω. For wideband applications, impedance matching on the RF transmission lines can further optimize high frequency insertion loss, return loss, and attenuation accuracy characteristics.

    The ADRF5720 comes in a 24-terminal, 4 mm × 4 mm, RoHS compliant, land grid array (LGA) package and operates from −40°C to +105°C.


    • Ultrawideband frequency range: 9 kHz to 40 GHz
    • Attenuation range: 0.5 dB steps to 31.5 dB
    • Low insertion loss with impedance match
      • 2.0 dB up to 18 GHz
      • 2.8 dB up to 26 GHz
      • 4.5 dBup to 40 GHz
    • Attenuation accuracy with impedance match
      • ±(0.20 + 1.0% of attenuation state) up to 18 GHz
      • ±(0.20 + 1.5% of attenuation state) up to 26 GHz
      • ±(0.40+ 3.0% of attenuation state) up to 40 GHz
    • Typical step error with impedance match
      • ±0.25 dB up to 26 GHz
      • ±0.65 dB up to 40 GHz
    • High input linearity
      • P0.1dB insertion loss state: 30 dBm
      • P0.1dB other attenuation states: 27 dBm
      • IP3: 50 dBm typical
    • High RF input power handling: 27 dBm average, 30 dBm peak
    • Tight distribution in relative phase
    • No low-frequency spurious signals
    • SPI and parallel mode control, CMOS/LVTTL compatible
    • RF amplitude settling time (0.1 dB of final RF output): 8 µs
    • 24-terminal, 4 mm × 4 mm LGA package
    • Pin-compatible with ADRF5730, fast switching version


    • Industrial Scanners
    • Test and Instrumentation
    • Cellular Infrastructure
    • 5G millimeter wave

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    ELE Times Research Desk
    ELE Times Research Desk
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