Quad Transimpedance Amplifier with Input Current Clamp and Multiplexer for LiDAR

Description

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The MAX40662 is a four-channel transimpedance amplifier for optical distance measurement receivers in LiDAR (Light Detection and Ranging) applications. Low noise, high gain, low group delay, and fast recovery from overload make this quad TIA ideal for time-of-flight distance-measurement applications. The four input transimpedance stages are multiplexed to a pair of differential outputs. Important features include 2.1pA/$\sqrt{\mathrm{Hz}}$ input-referred noise density, an internal current input clamp (up to 2A for 10ns pulses), pin-selectable 25kΩ and 50kΩ transimpedance, and wide 440MHz Bandwidth. An offset current input allows optional output offset adjustment to the output voltage. A low-power/standby mode can be used to help reduce average power supply current between pulses.

The MAX40662 is available in a 16-pin, 4mm x 4mm, TQFN package with side-wettable flanks and is specified over the -40°C to +125°C automotive operating temperature range.

Key Features

• AEC-Q100
• Enables ASIL Compliance (FMEDA Available Upon Request)
• Internal Multiplexer
• Bandwidth = 440MHz (typ), 300MHz (min) 
• Low Noise: 2.1pA/
• Optimized for C_IN = 0.5pF to 5pF
• Two Pin-Selectable Transimpedance Values
  • 25kΩ
  • 50kΩ
• OFFSET Input ​Enables DC Offset Cancellation from Photodiode at IN_ Input
• LP Input Reduce Power Dissipation Between Pulses
• Internal Clamps For Input Current Upto 2A For 10ns Pulses
• 3.3V Operation
• 16-pin, 4mm x 4mm TQFN Package With Side-Wettable Flanks

Applications/Uses

• Automotive Driver Assistance Systems
• LIDAR Receivers
• Optical Time-Of-Flight Distance Measurement