TDC-GPX2 Time-to-Digital Converter

TDC-GPX2 Time-to-Digital Converter

High-end multipurpose 4-channel converter.

The TDC-GPX2 is the most powerful member in our TDC family. Highest measurement performance and highest data throughput is achieved with LVDS stop inputs and LVDS serial output for each channel. Current saving operation is also possible with CMOS inputs and SPI readout. High configuration flexibility covers many applications.

Applications range from gaming, portable handheld laser range equipment to ambitious time-of-flight of highest performance, such as in medical imaging applications. 

GPX2 operates without any locked loop technologies. All stop event measurement times are calibrated inside the GPX2 proportional to the applied reference clock. Combinations of best single-shot accuracy of 10ps with lowest pulse-to-pulse spacing 5ns and maximum data throughput rate 70 MBPS per stop input are possible.

TDC-GPX2 Blockdiagram

TDC-GPX2 features and benefits


  • Simple data processing thanks to calibrated results and clock index
  • Easy pulse width measurements
  • High efficiency thanks to high sample rate
  • 4 differential stop channel inputs with serial differential output each (LVDS)
  • 16-stage FIFO per channel
  • Optional configuration as CMOS inputs


  • Suited for high-end applications
  • Allows for highest measurement rates and data throughput
  • Meets best in class resolution requirements
  • “Free running TDC” architecture
  • Enables compact designs (small form factor)

Product properties

  • Channels {#} 4
  • Inputs LVDS (CMOS)
  • Resolution [ps] 10
  • Pulse-Pair Resolution [ns] 20, channels combined < 5
  • Measurement Rate [MSPS] 70 (peak)
  • Multi-Hit Capability Unlimited
  • Operating Supply Range [V] 3.0 to 3.6
  • Interface Serial LVDS per channel, SPI
  • Ambient Temperature Range [°C] -40°C to +125°C
  • Package QFN64


Download documents

Related products

AS6500 Time-to-Digital Converter

AS6500 Time-to-Digital Converter

AS6501 Time-to-Digital Converter

AS6501 Time-to-Digital Converter

Related Tools

Evaluation kit

The GPX2-EVA-KIT evaluation system is designed as a platform for a quick and easy start of evaluation of the TDC-GPX2 time-to-digital converter.
The kit offers a graphical user interface for user-friendly configuration and extensive testing of the TDC-GPX2.