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ADI 公司的AD8283帶ADC的汽車雷達接收模擬前端（AFE），包括了六路低噪音放大器（LNA），可編增益放大器（PGA）和抗混淆濾波器（AAF）以及一路12位ADC。每路的增益通過SPI編程，增益從16dB到34dB，每步為6dB，輸入參考噪音電壓在最大增益時為3.5 nV/√Hz，SNR = 67 dB 和SFDR = 68 dB，主要用在汽車雷達，自適應碰撞控制，防止空中相撞，盲點檢測，自停車和電子緩沖器。本文介紹了AD8283主要特性，功能方框圖，雷達系統方框圖以及差分輸入和單端輸入的應用電路圖。 Radar Receive Path AFE: 6-Channel LNA/PGA/AAF with ADC The AD8283 is designed for low cost, low power, compact size, flexibility, and ease of use. It contains six 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 80 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 CMOS process, the AD8283 is available in a 10 mm × 10 mm, RoHS-compliant, 72-lead LFCSP. It is specified over the automotive temperature range of −40℃ to +105℃. AD8283主要特性： 6 channels of LNA, PGA, AAF 1 channel of direct-to-ADC Programmable gain amplifier (PGA) Includes low noise preamplifier (LNA) 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 MHz to 12 MHz Analog-to-digital converter (ADC) 12 bits of accuracy up to 80 MSPS SNR = 67 dB SFDR = 68 dB Low power, 170 mW per channel at 12 bits/80 MSPS Low noise, 3.5 nV/√Hz maximum of input referred voltage noise Power-down mode 72-lead, 10 mm × 10 mm, LFCSP package Specified from −40℃ to +105℃ Qualified for automotive applications AD8283應用： Automotive radar Adaptive cruise control Collision avoidance Blind spot detection Self-parking Electronic bumper 
圖1。AD8283方框圖
圖2。雷達系統方框圖
圖3。AD8283單路簡化方框圖
圖4。AD8283差分輸入應用電路圖
圖5。AD8283單端輸入應用電路圖 詳情請見： http://www.analog.com/static/imported-files/data_sheets/AD8283.pdf |
