TDC-GP22: General Purpose Time to Digital Converter (TDC)

General Features

• 4-wire SPI interface
• 1 MHz continuous data rate max.
• 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

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
• 3-fold multihit capability with automatic processing of all 3 data

Temperature Measurement Unit

• Chopper-stabilized low-offset comparator, programmable, ±35 mV
• First-wave detection: offset set zero automatically after first wave, hit selection relative to first wave
• First-wave pulse-width measurement for signal monitoring and bubble detection
• Integrated analog switches for input selection
• External circuit is reduced to 2 resistors and 2 capacitors

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
• 7×32 Bit EEPROM

Analog Input Circuit

• Chopper-stabilized low-offset comparator, programmable, ±35 mV
• First-wave detection: offset set zero automatically after first wave, hit selection relative to first wave
• First-wave pulse-width measurement for signal monitoring and bubble detection
• Integrated analog switches for input selection
• External circuit is reduced to 2 resistors and 2 capacitors

FUNCTIONAL BLOCK DIAGRAM

Resolution
typ. 90 ps, 45 ps in double resolution mode, 22 ps in quad resolution mode (only Measure Mode 2)