Reference design maximizing transimpedance bandwidth for LIDAR and time-of-flight (ToF) applications
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Key Document


This design demonstrates a high-speed optical front-end with a Time of Flight (ToF) distance measurement circuit using a fiber-optic transmission medium, which can be adapted to any type of ToF measurement such as through free space. This design features an industry-leading 2.5-V output linear transimpedance front-end with 10 kΩ of gain and over 200-MHz bandwidth for high-accuracy measurements. The received signal is digitized using the TDC7201 converter operating in short time mode, which improves the measurement accuracy of the device from 12 ns to 250 ps, further reinforcing the high accuracy nature of the design. The measurement is controlled using the MSP430 microcontroller on a LaunchPad™ development kit for easy plug and play compatibility. Overall, the design achieves higher speed and accuracy, reduces complexity and lowers power compared to fully digitized designs that require high-speed ADCs and FPGAs.

  • Optical front-end design with demonstrated time-of-flight measurement
  • High-Speed amplifier signal path with bandwidth greater than 200 MHz at Gain = 10 kΩ
  • Centimeter level measurement accuracy
  • High-speed transimpedance amplifier (TIA) for I-to-V conversion
  • Low computational cost and power requirements

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Design Files

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TI Devices (7)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA858  5.5 GHz Gain Bandwidth Product, Decompensated Transimpedance Amplifier with FET Input  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1T45  Single-Bit Dual-Supply Bus Transceiver with Configurable Voltage-Level Shifting and 3-State Outputs  Voltage level translators  Sample & Buy View Design Kits & Evaluation Modules
TDC7201  TDC7201 Time-to-Digital Converter for Time-of-Flight Applications  Specialty sensors  Sample & Buy View Design Kits & Evaluation Modules
TLV3501  4.5ns, Rail-to-Rail, High Speed Comparator with Shutdown  Amplifiers  Sample & Buy Not Available
TPS2400  5.5-V over voltage protection controller with 100-V input transient protection  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS799  200-mA, low-IQ, low-dropout voltage regulator with low-noise & enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TVS1400  14V flat-clamp surge protection device  Circuit protection ICs  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA858 Download Download
SN74LVC1T45 Download Download
Download Download
Download Download
Download -
TDC7201 Download -
TLV3501 Download Download
Download Download
TPS2400 Download Download
TPS799 -
TVS1400 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 873 28 Nov 2018
Design files (6)
Title Type Size (KB) Date
PDF 1164 28 Nov 2018
ZIP 3501 28 Nov 2018
ZIP 2602 28 Nov 2018
PDF 256 28 Nov 2018
PDF 258 28 Nov 2018
PDF 54 28 Nov 2018
Related Tools & Software

Hardware development (2)

Name Part Number Tool Type
MSP430F5529 USB LaunchPad development kit  MSP-EXP430F5529LP  Development kit 
TDC7201 Ultra Measurement Range Time-to-Digital Converter Evaluation Module  TDC7201-ZAX-EVM  Evaluation board 

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