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ADI AD8283汽车雷达接收模拟前端(AFE)解决方案

关键词:汽车电子 汽车雷达 倒车雷达 AFE

时间:2011-05-31 09:53:09       作者:ADI       来源:AD8283

ADI 公司的AD8283带ADC的汽车雷达接收模拟前端(AFE),包括了六路低噪音放大器(LNA),可编增益放大器(PGA)和抗混淆滤波器(AAF)以及一路12位ADC。每路的增益通过SPI编程,增益从16dB到34dB,每步为6dB,输入参考噪音电压在最大增益时为3.5 nV/√Hz,SNR = 67 dB 和SFDR = 68 dB,主要用在汽车雷达,自适应碰撞控制,防止空中相撞,盲点检测,自停车和电子缓冲器。本文介绍了AD8283主要特性,功能方框图,雷达系统方框图以及差分输入和单端输入的应用电路图。

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应用:

Automotive radar

Adaptive cruise control

Collision avoidance

Blind spot detection

Self-parking

Electronic bumper

图1。AD8283方框图

图2。雷达系统方框图

图3。AD8283单路简化方框图

图4。AD8283差分输入应用电路图

图5。AD8283单端输入应用电路图
详情请见:
http://www.analog.com/static/imported-files/data_sheets/AD8283.pdf

 

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