Main features of the TDC-GP21 Time-to-Digital Converter.
  • Precision Measurement Technologies
  • Technology Center for

UFC TDC-GP21 Features

General Features

  • 4-wire SPI interface
  • Up to 1 million measurements per second im Measure Mode 1
  • I/O voltage 2.5 V to 3.6 V
  • Core voltage 2.5 V to 3.6 V
  • Temperature range - 40 °C to +125 °C
  • QFN 32 package

General Circuit Features

Measurement Mode 1

  • 2 channels with typ. 90 ps resolution
  • 1-channel double resolution with typ. 45 ps
  • Range 3.5 ns (0 ns) to 2.5 µs
  • 20 ns pulse-pair resolution, 4-fold multihit
  • Up to 1 million measurements per second in measure mode 1

Measurement Mode 2

  • 1 channel with typ. 90 ps resolution
  • Double resolution mode with 45 ps, Quad resolution mode with 22 ps resolution
  • Measurement range 500 ns to 4 ms
  • 2 x CLKHS pulse-pair resolution with 3-fold multihit capability
  • Each of the 3 events can be assigned to an adjustable measuring window with 10 ns resolution

Special Functions

  • Fire pulse generator, up to 127 pulses
  • Trigger to rising and/or falling edge
  • Precise stop enable by windowing
  • Low-power 32 kHz oscillator (500 nA)
  • Clock calibration unit
  • 7x32 Bit EEPROM

Analog Input Circuit

  • Chopper-stabilized low-offset comparator
  • 2 analog switches for input selection
  • External circuit is reduced to 2 resistors and 2 capacitors

Temperature Measurement Unit

  • 2 or 4 sensors
  • PT100/PT500/PT1000 or higher
  • Schmitt trigger integrated
  • Very high resolution: up to 17.5 Bit eff. (0.004 °C resolution for platinum sensors)
  • Ultra low current (0.08 µA when measuring every 30 seconds)

Functional Block Diagram

(click to enlarge)