AS6500 Time-to-Digital Converter

AS6500 Time-to-Digital Converter

The AS6500 is a high performance time-to-digital converter (TDC) frontend device. It is a derivative of TDC-GPX2, with CMOS inputs and serial SPI output only. It comes in a QFN40 package. 

4-channel TDC with CMOS inputs


AS6500 achieves high measurement performance and high data throughput. High configuration flexibility and unlimited measurement range cover many applications, ranging from portable handheld laser range equipment to ambitious time-of-flight measurements of high performance. It calculates calibrated stop measurements, referenced to the applied reference clock. 

Combinations of single shot accuracy of 10ps with lowest pulse-to-pulse spacing <5ns and maximum data input burst rate of 70 MSPS per stop input are possible. Total data throughput via SPI is about 1.5 MSPS.

AS6500 Time-to-Digital Converter

AS6500 features and benefits


  • 4 stop channels with 20 ns pulse-to-pulse spacing
    2 combined channels with 5 ns pulse-to-pulse spacing
  • Maximum 1.5 MSPS via SPI
  • Single shot accuracy 20 ps RMS resolution per channel, 10 ps RMS with high resolution option
  • Unlimited measuring range 0s to 16s
  • Differential reference clock input 2 MHz to 12.5 MHz, optional with quartz
  • Inputs CMOS level, 16-stage FIFO per channel, readout with SPI, used also for configuration
  • Automatic calibration to reference clock
  • Supply voltage 3.3 V
  • Power dissipation 60 mW, standby current 60 μA
  • QFN40 package (6 mm × 6 mm)


  • Simple data post-processing thanks to calibrated results
  • Event assignment thanks to reference clock
  • Index simplifies coincidence measurements
  • Easy pulse width measurements
  • High efficiency thanks to high sample rate
  • Compact design thanks to small package and low number of external components
  • Reduced cooling thanks to low power consumption

Product properties

  • Channels 4
  • Inputs CMOS
  • Resolution [ps] 20
  • Pulse-Pair Resolution [ns] 20
  • Measurement Rate [MSPS] 1.5
  • Multi-Hit Capability Yes
  • Operating Supply Range [V] 3.3
  • Interface SPI
  • Ambient Temperature Range [°C] -40 to 125
  • Package QFN40


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Related products

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AS6501 Time-to-Digital Converter

TDC-GPX2 Time-to-Digital Converter

TDC-GPX2 Time-to-Digital Converter

Related Tools

Development kit

The AS6500-QF development kit is designed as a platform for a quick and easy start of evaluation of the AS6500 time-to-digital converter. The kit offers a graphical user interface for user-friendly configuration and extensive testing of the AS6500.