Radar Receive Path AFE: 4-Channel LNA/PGA/AAF with ADC

The AD8285 is designed for low cost, low power, compact size, flexibility, and ease of use. It contains four channels of a low noise preamplifier (LNA) with a programmable gain amplifier (PGA) and an antialiasing 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 16 dB to 34 dB in 6 dB increments and an ADC with a conversion rate of up to 72 MSPS. The combined input referred noise voltage 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 complementary metal oxide semiconductor (CMOS) process, the AD8285 is available in a 10 mm × 10 mm, RoHS compliant, 72-lead LFCSP that is specified over the automotive temperature range of −40°C to +105°C.

APPLICATIONS

* Automotive radar

Adaptive cruise control

Collision avoidance

Blind spot detection

Self parking

Electronic bumper

* 4-channel LNA, PGA, and AAF

* Low power: 185 mW per channel at 12 bits and 72 MSPS

* Programmable gain amplifier (PGA)

Includes low noise preamplifier (LNA)

Serial peripheral interface (SPI) programmable gain 16 dB to 34 dB in 6 dB steps

* Antialiasing filter (AAF)

Programmable third order, low-pass elliptic filter (LPF) from 1.0 MHz to 12.0 MHz