Time-to-Digital Converters

Image of a HPTDC Currently, three solutions for PC-based precision time measurements are available from cronologic.

The dedicated time to digital converter HPTDC8-PCI will soon be replaced by the faster xTDC4. Both are designed for applications requiring high single shot resolution on many channels, such as the readout of delay line detectors.

The Ndigo5G is a high speed ADC digitizer with hardware preprocessing for pulse signals. It samples signals by an analog to digital converter (ADC) with 10 bits resolution at 5 Gsps. Processing this data provides even higher time resolutions and can provide amplitude information in addition to the time stamps. It is designed to be used in time-of-flight mass spectrometers, LIDAR and other TOF applications with low channel count.

Both product lines can also be used as frequency counter, time interval analyzer (TIA) and for single photon counting.

Facts HPTDC xTDC4 xHPTDC8 Ndigo5G
Channels 8 high resolution NIM AC coupled
1 low resolution NIM AC coupled
12 low resolution 3.3 V CMOS DC coupled
1 NIM start AC coupled
4 NIM stop TDC channels AC coupled
8 NIM AC coupled TDC
1 NIM AC coupled low speed ADC
4 high res AC coupled ADC
1 high res AC coupled TDC
1 low res gating channel
Connectors 10x LEMO 00
1x 26 pin ribbon
5x LEMO 00 10x LEMO 00 6x LEMO 00
Bin Size 25 ps highres
12.8 ns lowres
13 ps highres
13 ps highres
10 ps highres
3.2 ns lowres
Double Pulse Resolution <5 ns typical 4 ns 4 ns <1 ns
Multihit unlimited 15 unlimited unlimited
Dead Time Between Groups none parameter dependent none none
Readout Rate 4 MHits/s 48 MHits/s 48 MHits/s 6 MHits/s
Range 419 µs with trigger logic
2 h untriggered (extendable)
218 µs default,
14 ms extended
unlimited 106 d
Common start/stop yes/yes yes/no yes/yes
yes/yes
Number of boards that can be event-synchronized 3 none 8 8
PCI 5V, 32-bit, 33 MHz, bus master, PCI 2.2
PCIe 1.1 x1, bus master PCIe 1.1 x1, bus master PCIe 1.1 x4, bus master
Time Base 1 ppm on board or external 78.125 MHz clock 50 ppb on board 50 ppb on board 50 ppb on board or external 10 MHz clock
Additional features On-board calibration data storage
Adjustable trigger windows
Overlapping events possible
Easy to use Windows C API
In-system firmware update
On-board calibration data storage
Adjustable trigger windows
Easy to use Windows C API
In-system firmware update
On-board calibration data storage
Adjustable trigger windows, com-start/stop
Easy to use Windows C API
In-system firmware update
On-board calibration data storage
Adjustable trigger windows
Overlapping events possible
Easy to use Windows C API
In-system firmware update
Availability now now soon now