原标题：Maxim MAX40661汽车激光雷达(LiDAR)跨阻放大器解决方案

　　摘要: Maxim公司的MAX40661和MAX40660是用于汽车激光雷达(LiDAR)应用的光学测距测量接收器的跨阻放大器(TIA),具有低噪音高增益低群时延和过载状态下快速恢复时间.它的重要特性包括输入参考噪声密度(MAX40660)2.38pA,内部输入钳位,引脚选择25kΩ和 50kΩ跨阻,宽带宽490MHz(MAX40660),输入电容0.5pF和跨阻25kΩ; MAX40661的带宽为160MHz,输入电容10pF. MAX40661和MAX40660满足AEC-Q100规范,和ASIL兼容,采用3mm x 3mm,10引脚TDFN封装,工作温度-40°C 到 +125°C.主要用在光学测距,LiDAR接收器,工业安全系统,汽车驾驭系统.本文介绍了MAX40661主要特性和优势, 简化框图和典型应用电路,以及评估板MAX40661 EVK主要特性,电路图,材料清单和PCB设计图.

　　The MAX40660 and MAX40661 are transimpedance am-plifiers for optical distance measurement receivers in Li-DAR applications. Low noise, high gain, low group delay, and fast recovery from overload make these TIAs ideal for distance-measurement applications. Important features include 2.38pA input-referred noise density (MAX40660), an internal input clamp, pin-selectable 25kΩ and 50kΩ transimpedance, and wide bandwidth (490MHz (typ) for the MAX40660 with 0.5pF input capacitance and 25kΩ transimpedance; 160MHz (typ) for the MAX40661 with 10pF input capacitance). An offset current input allows optional adjustment of input offset current. A low-power/standby control input reduces the supply current by better than 80% to help reduce average power supply current between pulses. The MAX40660 and MAX40661 transim-pedance amplifiers feature AEC-Q100 qualification, en-able ASIL compliance, and are available in a 3mm x 3mm,10-lead TDFN package with side-wettable flanks, making them excellent choices for automotive LiDAR ap-plications. In addition to the TDFN package, the MAX40660 and MAX40661 are available as bare die, and are specified over the -40°C to +125°C automotive operating tempera-ture range.

　　MAX40661主要特性和优势:

　　●AEC-Q100

　　●Enables ASIL Compliance (FMEDA Available UponRequest)

　　●MAX40660

　　•Optimized for CIN = 0.25pF to 5pF

　　•Bandwidth = 490MHz (Typ)

　　●MAX40661

　　•Optimized for CIN = 5pF to 12pF

　　•Bandwidth (CIN = 10pF) = 160MHz (Typ), 100MHz(Min)

　　●Low Noise

　　●Two Pin-Selectable Transimpedance Values

　　•25kΩ

　　•50kΩ

　　●Internal Clamp For Input Current Up To 2A (Transient)

　　●Fast Overload Recovery: 2ns at 100mA

　　●Offset Input Provides Offset Adjust Feature

　　●LP Input Reduces Power Dissipation Between Pulses

　　●3.3V Operation

　　●10-Pin TDFN (Side-Wettable) or Bare Die

　　MAX40661应用:

　　●Optical Distance Measurement

　　●LiDAR Receivers

　　●Industrial Safety Systems

　　●Autonomous Driving Systems

　　●Automotive Applications

　　图1. MAX40661简化框图

　　图2. MAX40661典型应用电路图(1)

　　图3. MAX40661典型应用电路图(2)

　　评估板MAX40661 EVK

　　The MAX40661 evaluation kit (EV kit) is a fully assembled electrical demonstration kit that provides a proven design to evaluate the MAX40661 transimpedance amplifiers.

　　Note that the MAX40661 EV kit provides an electrical interface to the IC that is similar, but not the same as a photodiode.

　　The MAX40661 EV kit PCB comes with a MAX40661ATB/VY+ installed.

　　评估板MAX40661 EVK主要特性:

　　●● Easy Electrical Evaluation of the MAX40661

　　●● EV Kit Designed for 50Ω Interfaces

　　●● -40°C to +125°C Temperature Range

　　●● Tested 10-TDFN-EP MAX40661ATB/VY+ Device

　　●● Accommodates Easy-to-Use Components

　　●● Proven PCB Layout

　　●● Fully Assembled and Tested

　　图4. 评估板MAX40661 EVK外形图

　　图5.评估板MAX40661 EVK电路图