AD8284

Data Sheet Radar Receive Path AFE: 4-Channel Mux with LNA, PGA, AAF, and ADC AD8284 FEATURES 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 of up to 60 MSPS SNR = 67 dB SFDR = 68 dBc Low power, 345 mW at 12 bits per 60 MSPS Low noise, 3.5 nV/√Hz maximum of input referred voltage noise Power-down mode 64-lead, 10 mm × 10 mm TQFP package Specified from −40°C to +105°C Qualified for automotive applications APPLICATIONS Automotive radar Adaptive cruise control Collision avoidance Blind spot detection Self parking Electronic bumper GENERAL DESCRIPTION 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 o...