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


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

View more

Parametrics Compare all products in Ultrasonic

Number of input channels
Active supply current (Typ) (mA)
Sleep Supply Current (Typ) (uA)
Supply Voltage (Max)
Supply Voltage (Min)
Operating temperature range (C)
Package Group
Package size: mm2:W x L (PKG)
Approx. price (US$)
TDC7201 TDC7200
2     1    
SPI     SPI    
2.7     1.35    
0.6     0.3    
3.6     3.6    
2.0     2.0    
Catalog     Catalog    
-40 to 85     -40 to 85    
NFBGA | 25     TSSOP | 14    
25NFBGA: 16 mm2: 4 x 4 (NFBGA | 25)     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)    
1.35 | 1ku     0.80 | 1ku    
Time of flight     Time of flight