MaximMAX3806激光测距解决方案  2012/3/1

         Maxim 公司的MAX3806是高增益线性前置放大器,主要用于激光测距. MAX3806工作电压5V,能把光电二极管交流耦合的电流转换成单端电压信号,线性范围高达40uAP,过载电流高达2mAP,5.0V时的功耗为50mW,可选择增益为60K或30K,可选择衰减为14dB,主要用于汽车中的LIDAR传感器,手提测距的激光传感器,测试测量和工业控制的激光传感器.本文介绍了MAX3806的主要特性,功能方框图以及典型应用电路.

The MAX3806 is ahigh-gain linear preamplifier for distance measurement applications using a laser beam. The device operates from a single +5.0V supply and converts current from an AC-coupled photodiode into a single-ended voltage signal. The input accepts single pulses or bursts of pulses with widths down to 30ns.
The amplifier remains linear with input amplitudes from 42nAP (SNR= 3) to 40μAP. It can also withstand overload signals as large as 2mAP. The output stage is designed to drive a high-impedance load to deliver the output-voltage swing at the lowest possible power dissipation.
The gain of the preamplifier stage is selected using the GAINpinto be 60k??or 30k?. There is also an internal 14dB attenuator that is selected using the ATT pin. The output stage can be disabled (high impedance).

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