Features and Benefits

  • 0.5 GHz to 19 GHz frequency range
  • Programmable Time Delay: 7-bit resolution
  • Programmable Time Delay Modes
    • TD_Mode0: 0 to 508ps range, 4ps Standard resolution
    • TD_Mode1: 0 to 254ps range, 2ps High resolution
  • Programmable Attenuation: 6-bit resolution
    • 31.5 dB adjustment range
    • 0.5 dB step size
  • Fully programmable via a 3-wire or 4-wire SPI interface
  • SPI Programmable and Daisy Chaining selectable
  • Power Dissipation: 1 mW with 1.2V and 1.0V Dual Supplies
  • 14-pin 2x3mm LFCSP

Product Details

The ADAR4002 is a very low power broadband bi-directional single channel true time delay unit (TDU) and a digital step attenuator (DSA). The IC has 18.5 GHz of bandwidth over a frequency range of 0.5 GHz to 19 GHz with 50 Ω input impedance at both RF ports. The TDU has two programmable maximum time delays, each with 7-bit control: Range 0 has a maximum delay of 508ps with a resolution of 4ps. This range is used at lower frequencies and where the ADAR4002 has less loss. Range 1 has a maximum delay of 254ps and a resolution of 2ps. This range has less loss compared to Range 0 and is useful at higher frequencies. The DSA has 6-bit resolution with an attenuation range of 0 dB to 31.5 dB and a step size of 0.5 dB. The ADAR4002 is designed to provide flexible digital control through either a SPI interface or a shift register to allow daisy chaining multiple chips together. The ADAR4002 contains register memory for 32 TDU+DSA states. The memory combined with on-chip sequencers, allows a fast memory advance via the UPDATE pin.

The ADAR4002 is available in a 2 mm × 3 mm 14-lead LFCSP package and is specified from -40°C to 85°C.


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  • Multi-Function Arrays
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  • Test Equipment
  • For more information please contact ADI at beamformer@analog.com.

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