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AD8284:  Radar Receive Path AFE: 4-Channel MUX with LNA, PGA, AAF, and ADC

Product Details

Product Status:Recommended for New Designs

The AD8284 is an integrated analog front end designed for low cost, compact size, flexibility, and ease of use. It contains a 4-channel differential multiplexer (mux), a 1-channel low noise preamplifier (LNA) with a programmable gain amplifier (PGA) and an antialiasing filter (AAF), as well as one direct-to-ADC channel, all integrated with a single, 12-bit analog-to-digital converter (ADC). The AD8284 also incorporates a saturation detection circuit for high frequency overvoltage conditions that would otherwise be filtered by the AAF.

The analog channel features a gain range of 17 dB to 35 dB in 6 dB increments, and an ADC with a conversion rate of up to 80 MSPS. The combined input referred voltage noise of the entire channel is 3.5 nV/√Hz at maximum gain. The channel is optimized for dynamic performance and low power in applications where a small package size is critical.

Fabricated in an advanced CMOS process, the AD8284 is available in a 10 mm × 10 mm, RoHS compliant, 64-lead TQFP. It is speci-fied over the automotive temperature range of −40°C to +105°C.

  • Automotive radar
  •   Adaptive cruise control
      Collision avoidance
      Blind spot detection
      Electronic bumper


  • 4 channel MUX to LNA, PGA, AAF
  • 1 direct-to-ADC channel
  • Programmable gain amplifier (PGA)
  • Includes low noise preamplifier (LNA)
  • SPI-programmable gain = 17 dB to 35 dB in 6 dB steps
  • Antialiasing filter (AAF)
  • Programmable third-order low-pass elliptic filter (LPF) from 9 MHz to 15 MHz
  • Analog-to-digital converter (ADC)
  • 12 bits of accuracy up to 80 MSPS
  • SNR = 67 dB
  • SFDR = 68 dBc
  • See data sheet for additional features

Functional Block Diagram for AD8284

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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