Analog Devices Inc. AD8285 Radar Receive Path AFE

Analog Devices Inc. AD8285 Radar Receive Path Analog Front End (AFE) features four channels of a low noise preamplifier (LNA) with a programmable gain amplifier (PGA) and an anti-aliasing filter (AAF) plus one direct-to-ADC channel, all integrated with a single 12-bit analog-to-digital converter (ADC). Each channel features a gain range of 16dB to 34dB in 6dB increments and an ADC with a conversion rate of up to 72MSPS. 

The combined input referred noise voltage of the entire channel is 3.5nV/√Hz at maximum gain. The channel is optimized for dynamic performance and low power in applications where a small package size is critical such as the automotive radar in adaptive cruise control, collision avoidance, blind spot detection, self parking, and electronic bumpers.


  • 4 channel LNA, PGA, and AAF
  • 1 direct-to-ADC channel
  • Programmable gain amplifier (PGA)
    • Includes low noise preamplifier (LNA)
    • Serial peripheral interface (SPI) programmable gain 16dB to 34dB in 6dB steps
  • Anti-aliasing filter (AAF)
    • Programmable third-order, low-pass elliptic filter (LPF) from 1.0MHz to 12.0MHz
  • Analog-to-digital converter (ADC)
    • 12 bits of accuracy up to 72MSPS
    • 68.5dB Signal-to-noise ratio (SNR)
    • 68dB at gain =16dB Spurious-free dynamic range (SFDR)
  • Low power of 185mW per channel at 12bits and 72MSPS
  • Low noise of 3.5nV/√Hz maximum of input referred voltage noise


  • Automotive radar
  • Adaptive cruise control
  • Collision avoidance
  • Blind spot detection
  • Self parking
  • Electronic bumpers

Functional Block Diagram

Block Diagram - Analog Devices Inc. AD8285 Radar Receive Path AFE
Published: 2014-11-18 | Updated: 2022-03-11