Time-to-digital converter for time-of-flight (ToF) applications for LIDAR and ultrasonic


Product details


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TSSOP (PW) 14 32 mm² 5 x 6.4 open-in-new Find other Ultrasonic sensor AFEs


  • Resolution: 55 ps
  • Standard Deviation: 35 ps
  • Measurement Range:
    • Mode 1: 12 ns to 500 ns
    • Mode 2: 250 ns to 8 ms
  • Low Power Consumption: 0.5 µA (2 SPS)
  • Supports up to 5 STOP Signals
  • Autonomous Multi-Cycle Averaging Mode for Low
    Power Consumption
  • Supply Voltage: 2 V to 3.6 V
  • Operating Temperature –40°C to 85°C
  • SPI Host Interface for Configuration and Register
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The TDC7200 is a Time-to-Digital Converter (TDC) for ultrasonic sensing measurements such as water flow meter, gas flow meter, and heat flow meter. When paired with the TDC1000 (ultrasonic analog-front-end), the TDC7200 can be a part of a complete TI ultrasonic sensing solution that includes the MSP430, power, wireless, and source code.

The Time to Digital Converter (TDC) performs the function of a stopwatch and measures the elapsed time (time-of-flight or TOF) between a START pulse and up to five STOP pulses. The ability to measure from START to multiple STOPs gives users the flexibility to select which STOP pulse yields the best echo performance.

The device has an internal self-calibrated time base which compensates for drift over time and temperature. Self-calibration enables time-to-digital conversion accuracy in the order of picoseconds. This accuracy makes the TDC7200 ideal for flow meter applications, where zero and low flow measurements require high accuracy.

When placed in the Autonomous Multi-Cycle Averaging Mode, the TDC7200 can be optimized for low system power consumption, making it ideal for battery powered flow meters. In this mode, the host can go to sleep to save power, and it can wake up when interrupted by the TDC upon completion of the measurement sequence.

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Technical documentation

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Type Title Date
* Data sheet TDC7200 Time-to-Digital Converter for Time-of-Flight Applications in LIDAR, Magnetostrictive and Flow Meters datasheet (Rev. D) Mar. 07, 2016
Technical article How ultrasonic technology improves convenience and performance in home automation Oct. 05, 2017
Technical article Power naps: saving energy using ultrasonic sensing Aug. 16, 2016
Application note Interleaved Short Time Measurements Using TDC7200 Oct. 30, 2015
Technical article Time-of-flight measurements using high-performance time-to-digital converters Jul. 31, 2015
Technical article Why are flow meter manufacturers switching from mechanical to ultrasonic? Jun. 11, 2015
Application note Measuring an RTD Sensor with the TDC1000 and TDC7200 for Ultrasonic Sensing Apr. 09, 2015
User guide TDC7200EVM User’s Guide Jan. 08, 2015

Design & development

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Hardware development

document-generic User guide

The TDC7200EVM is an evaluation module that allows users to evaluate the operation and performance of the TDC7200 Time-to-Digital Converter. One example is calculating time of flight – whether it be for LIDAR or ultrasonic applications. The TDC7200EVM has two SMA connectors for the START and (...)

  1. EVM connect with MSP430 Launch Pad (MSP-EXP430F5529LP)*
  2. User friendly TDC7200 GUI interface
  3. Connection for START and STOP inputs
  4. Powered by MSP430 LaunchPad (no external power needed)

*MSP430 LaunchPad has to be ordered separately and not part of the TDC7200EVM

Design tools & simulation

SNAM176.ZIP (37 KB) - IBIS Model

Reference designs

LIDAR Pulsed Time of Flight Reference Design
TIDA-00663 — Light Detection and Ranging (LIDAR) systems use the time taken by the light to fly back and forth to an object in an effort to measure the distance to this target.  The TIDA-00663 reference design shows how to design the time measurement back-end for LIDAR based on Time to Digital Converter (...)
document-generic Schematic document-generic User guide
Ultrasonic Water Flow Meter Design using Time to Digital Conversion
TIDM-ULTRASONIC-FLOW-TDC The TIDM-ULTRASONIC-FLOW-TDC is a reference design for an ultrasonic flow meter (water, gas or heat meter) with LCD built using a Time-to-Digital converter and an ultra-low power MCU. Solution includes optimized leakage detection, low power consumption, and a small form factor that are (...)
document-generic Schematic document-generic User guide

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