TDC7200 Time-to-digital converter for time-of-flight (ToF) applications for LIDAR and ultrasonic |

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



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.


  • 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

Design with TDC7200

Use this tool to view the recommended evaluation module (EVM) and transducer for your application:
  •  Fluid Level Measurement
  •  Fluid Identification
  •  Water/ Gas/ Heat Metering


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Part number Order Device type Number of input channels Interface Supply voltage (Max) Supply voltage (Min) Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Approx. price (US$)
TDC7200 Order now Time-to-digital converter     1     SPI     3.6     2     Catalog     -40 to 85     TSSOP | 14     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)     0.80 | 1ku    
TDC7201 Order now Time-to-digital converter     2     SPI     3.6     2     Catalog     -40 to 85     NFBGA | 25     25NFBGA: 16 mm2: 4 x 4 (NFBGA | 25)     1.35 | 1ku