AS6500: Time to Digital Converter (TDC)

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

High data throughput and measurement performance are attained by the AS6500 TDC. Numerous applications are covered by the high configuration flexibility and infinite measurement range, from high-performance time-of-flight measurements to small handheld laser rangefinders. It computes stop measures that are calibrated and compared to the applied reference clock.

It is achievable to combine the lowest pulse-to-pulse spacing of <5 ns with a single shot precision of 10 ps and a maximum data input burst rate of 70 MSPS per stop input. SPI allows for a total data rate of roughly 1.5 MSPS.



  • 2 stop channels with 5 ns / 20 ns pulse-to-pulse spacing.
  • Maximum 70 MSPS per LVDS output.
  • 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.
  • LVDS Inputs and outputs, 16-stage FIFO per channel, SPI compatible 4-wire interface for configuration, optionally to be used for data readout.
  • Automatic calibrationto reference clock.
  • Supply voltage 3.3 V.
  • Power dissipation up to 450 mW, standby current 60 μA.
  • QFP48 package (7 x 7 mm², 9 × 9 mm² with leads).


  • Simple data post-processing thanks to calibrated results.
  • Event assignment thanks to reference clock and index simplifies coincidence measurements.
  • EAsy pulse width measurements.
  • High efficiency due to high sample rate.
  • Compact design thanks to small package and low number of external components.
  • Reduced cooling because of low power consumption.
AS6500 – Time-to-Digital Converter

Documentation & Downloads

Ordering Numbers

Type Part number Package RoHS compl. Shipping package
TDC-GP22 MNR 1949 QFN32 Yes Tray
TDC-GP22 MNR 1950 QFN32 Yes Tape & Reel (5k)
GP22-EVA-KIT MNR 1951 System Yes Box
GP22-DEMO-KIT MNR 1979 System Yes Box
TDC-GP21 MNR 1839 QFN32 Yes Tray
TDC-GP21 MNR 1720 QFN32 Yes Tape & Reel (3K/5K)
GP21-EVA-KIT MNR 1781 System Yes Box
TDC-GP2 MNR 1058 QFN32 Yes Tray
TDC-GP2 MNR 1480 QFN32 Yes Tape & Reel (2k)
TDC-GP1 MNR 278 TQFP44 Yes Tray
TDC-GPX MNR 975 TQFP100 Yes Tray
TDC-GPX-FG MNR 1089 TFBGA120 Yes Tray


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