xTDC4

xTDC4

xTDC4: Our fastest common-start time to digital converter

A classic common-start TDC featuring 4 stop channels with a bin size of 13ps.

The xTDC4 time interval analyzer is based on a classic common-start architecture yielding high data throughput. In a common-start scenario, the arrival times of pulses on the "stop"-inputs are measured relative to a signal on the "start"-input. The xTDC4 is ideally suited for a multitude of time-of-flight applications such as TOF mass spectrometry (TOF-MS), time-correlated single photon counting (TCSPC), and LIDAR.

The xTDC4's four-stop channels allow, for example, the use of segmented detectors or measure pulses from a single detector channel at multiple thresholds to obtain rudimentary pulse height information. Such features are beneficial in many TOF-MS applications and LIDAR light detection and ranging. Fluorescence lifetime imaging microscopes (FLIM) benefit strongly from the high timing resolution of the xTDC4.

The integration of an xTDC4 time interval meter into your data acquisition application is easy! The unit provides a stream of simple data structures as a ring buffer, containing a list of relative time stamps for all stop events. When you do not need information about the pulse shape for your measurement, in many cases we recommend using TDCs. These make it possible to measure the arrival time of the pulses with extreme precision, involving significantly lower costs per measurement channel and less load on the CPU than with ADCs. cronologic will support you with drivers for Windows and Linux.

The xTDC4 time-to-digital converter is available as PCIe card ( xTDC4-PCIe ) or as an external desktop unit ( xTDC4-TBT ). The latter can be connected to any Thunderbolt port as standard to read out data. Contact us for various mounting options.



The occurring cycle-to-cycle jitter of the xTDC4 is significantly lower than the bin size of 13ps. Therefore you can expect an RMS error below 7ps for your measurements. Only 5 ns have to be between consecutive hits on the same input channel for them to be reliably recognized.

High precision

The occurring cycle-to-cycle jitter of the xTDC4 is significantly lower than the bin size of 13ps. Therefore you can expect an RMS error below 7ps for your measurements. Only 5 ns have to be between consecutive hits on the same input channel for them to be reliably recognized.
The threshold discriminators can handle positive and negative threshold settings with configurable levels. This allows you to use the xTDC4 with a wide range of detectors or constant fraction discriminators (CFD).

Bipolar

The threshold discriminators can handle positive and negative threshold settings with configurable levels. This allows you to use the xTDC4 with a wide range of detectors or constant fraction discriminators (CFD).
All inputs can also be used to output periodic pulse patterns for controlling external devices. The exact timing of the generated pulses is measured by the TDC. For more flexibility and different applications, each TiGer block can be triggered by an arbitrary combination of inputs, including an auto-trigger.

TiGer timing generator

All inputs can also be used to output periodic pulse patterns for controlling external devices. The exact timing of the generated pulses is measured by the TDC. For more flexibility and different applications, each TiGer block can be triggered by an arbitrary combination of inputs, including an auto-trigger.
This unit is available as external desktop device for connection to Thunderbolt ports.

Plug & Play

This unit is available as external desktop device for connection to Thunderbolt ports.

xTDC4

Data

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xTDC4

- Data

Optimized for
common start
1 start & 4 stop channels
-
5x LEMO 00
13 ps
5 ns
8000x per start event
parameter dependent
30 MHits/s total; 11.6 MHits/s per channel
218 µs / 14 ms extended
yes / no
no sync possible
PCIe2 x1 @ 400 MB/s (or connects to TBT)
10 ppb on board
TDC channels
Additional inputs
Connectors
bin size
Double pulse resolution
Multihit
Dead time between groups
Readout rate
Timestamp range
Common start/stop
Number of boards that can be synced
Readout interface
Time base
Linux support available
yes
low cost

Ndigo Crates

Our Ndigo Crates allow for using up to 8 PCIe-boards with a conventional PC. The external chassis is connected employing a  PCIe2 x16-interface.
Crate5
Crate3
Crate
PCIe3 x16
8 GByte/s
16x
2
3
2
0
included
PCIe3 x16
8 GByte/s
16x
2
3
0
2
included
PCIe2 x16
8 GByte/s
8x
0
8
0
0
included

Applications:

FLIM

(fluorescence-lifetime imaging microscopy)
The decay time of an excited fluorophore is typically in the range of a few nanoseconds. In fluorescence lifetime imaging the exponential decay of a sample is determined requiring a timing resolution in the picosecond regime.

LIDAR

also known as: LIDAR, LiDAR, and LADAR, "light detection and ranging", "laser imaging, detection, and ranging", "3-D laser scanning", "LIDAR mapping", "airborne laser scanning", ALS
LIDAR Systems emit ultraviolet, visible, or near-infrared light to image objects and measuring the time-of-flight (TOF) of reflected photons. Such systems are used for object detection and tracking in many different fields, ranging from archaeology to agriculture, autonomous vehicles and robots etc.

OTDR

optical time-domain reflectometry, optical time-domain reflectometer, remote fiber testing
In optical time-domain reflectometry the time of the reflections is determined from the reflection loss by measuring from the same end of the fiber how much light returns via the Rayleigh backscatter or is being reflected from individual locations along the fiber.

Quantum Sensing

see also: quantum metrology
Quantum sensing is an overall term that encompasses techniques and methods that use quantum mechanical phenomena to make precise measurements of physical quantities. Thereby, quantum mechanical states and effects are used to improve the measurement accuracy beyond the limits of classical sensors.

TOF mass spectrometry

ToF- & MASS- spectroscopy detectors, TOFMS
In many ToF-MS units cronologic TDCs are used to measure precisely the arrival of single ions. From the arrival time, the ion’s time-of-flight is deduced, from which the mass-to-charge ratio of the detected particle can be determined.

Time Domain Reflectometry

TDR, distance-to-fault, DTF
TDR (Time Domain Reflectometry) is an electronic measurement method that measures reflections along a conductor. It belongs to the category of Distance-to-Fault (DTF) measurements. TDR measurements provide meaningful information about the broadband behavior of transmission systems.

Time-Correlated Single Photon Counting

TCSPC, photon counting, time-correlated single photon counting, detection of individual photons, single-photon detectors (SPD), photosensors
Whether in astrophysics, materials science, quantum information science, quantum encryption, medical imaging, DNA sequencing or in fiber-optic communication: Single-photon detectors (SPD) provide a timing signal from which, for example, fluorescence lifetimes of excited matter can be deduced.

Time-of-Flight Secondary Ion Mass Spectrometry

TOF-SIMS (Time-of-Flight Secondary Ion Mass Spectrometry) is a high-resolution, if required, imaging analysis method for characterizing solid surfaces.

atomic clocks comparisons

two-way satellite time and frequency transfer, TWSTFT, coupling of atomic clocks
We are quite proud that our time to digital converters resolve so accurately that they are suitable for comparing atomic clocks.

fluorescence lifetime correlation spectroscopy

FLCS, FCS, fluorescence lifetime correlation spectroscopy
Fluorescence-correlation-spectroscopy is a highly sensitive optical measurement method. Fluctuations in the fluorescence emission intensity over time are recorded, which are caused by individual fluorophores that pass through the detection volume.

phase shift measurements

frequency and phase shift measurements, phase-noise-analyzers
In phase measurements the phase of an incident signal is compared to the phase of a device's response signal. With increasing frequency, such phase shift measurements become more challenging. cronologic TDCs provide many features which help to address this difficult task.

quantum research

Quantum research affects many areas of modern science: quantum cryptography, quantum information science, quantum encryption, quantum key distribution (QKD), quantum electro dynamics (QED), quantum computing etc.
Quantum phenomena such as superposition, uncertainty, and entanglement are studied in quantum research with the goal that they can be safely fabricated when needed and made useful in various disciplines.

Frequently asked Questions