TDC7201 TDC7201 Time-to-Digital Converter for Time-of-Flight Applications |

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TDC7201 Time-to-Digital Converter for Time-of-Flight Applications



The TDC7201 is designed for use with ultrasonic, laser and radar range finding equipment using time-of-flight technique. The TDC7201 has two built-in Time-to-Digital Converters (TDCs) that can be used to measure distance down to 4 cm and up to several kilometers using a simple architecture, which eliminates the need to use expensive FPGAs or processors.

Each 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 simultaneously and individually on two pairs of START and STOP pins using two built-in TDCs offers high flexibility in time measurement design.

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 TDC7201 ideal for range finder applications.

When placed in the Autonomous Multi-Cycle Averaging Mode, the TDC7201 device can be optimized for low system power consumption, which is ideal for battery-powered flow meters. In this mode, the host can go to sleep to save power and wake up when interrupted by the TDC upon completion of the measurement sequence.


  • Resolution: 55 ps
  • Standard Deviation: 35 ps
  • Measurement Range:
    • Individual Mode 1: 12 ns to 2000 ns
    • Individual Mode 2: 250 ns to 8 ms
    • Combined Operation: 0.25 ns to 8 ms
  • Low Active Power Consumption: 2.7 mA
  • Supports up to 10 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 Interface for Register Access


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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$)
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)     1.19 | 1ku    
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)     0.70 | 1ku