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DT2745

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64 Channel 16 bit 125 MS/s Digitizer with Programmable Input Gain

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Features

  • 16-bit @ 125 MS/s ADC
  • 64 analog inputs, differential or single-ended, on four 2mm 40-pin header connectors
  • Software selectable Analog Gain up to x100
  • Open FPGA programming through graphical tool SCI-Compiler
  • Wide range of applications (from Neutrino Physics & Dark Matter to Nuclear and Particle Physics to Spectroscopic Imaging)
  • Suited for signals from Semiconductor Detectors coupled with CSPs (Si, HPGe) or scintillators coupled with PMTs (NaI, CsI)
  • On-board firmware selection for different acquisition modes:
    • Scope mode (simultaneous raw waveform acquisition on common trigger)
    • DPP-PHA mode (pulse height and time acquisition on independent channel self-triggers)
    • DPP-PSD mode (pulse shape discrimination and time acquisition on independent channel self-triggers)
    • Predisposition for other algorithms like zero suppression and data reduction
  • Multi-board synchronization and system building capabilities
  • Rack mount brackets included
  • Front panel fully programmable I/Os (4 LEMO TTL/NIM and 16 LVDS)
  • Special 125MS/s 14bit DAC output (LEMO) for signal inspection, pulse generation, majority level
  • 2.5GB of Total Acquisition memory (DDR4)
  • On-board Zynq® UltraScale +™ MPSoC integrating an Arm®-based CPU running Linux®
  • Multi Interface: USB-3.0 and 1/10 GbE
  • Fully supported by CoMPASS and WaveDump2 readout software (CoMPASS support is Available on request)
  • SDK for embedded Arm and host PC
  • Open FPGA architecture for pulse analysis algorithm customization
More info
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Overview

The DT2745 Digitizer is a 64-channel digital signal processor for radiation detectors in a Desktop form factor. It offers not only waveform digitization and recording but also Multi-Channel Analysis for nuclear spectroscopy using Silicon strip, segmented HPGe, Scintillation detector with PMTs, Wire Chambers, and others.

The DT2745 can perform pulse height measurements (PHA), and other algorithms that will be gradually developed, such as constant fraction timing (CFD), charge integration (QDC) and pulse shape discrimination (PSD). Algorithm settings can be set independently channel by channel.

The input channels with software selectable analog gain up to x100 are provided as differential (on 2745 versions) or single-ended (on 2745B versions).

Each channel of the module digitizes the analog input, that can be the signal coming from a physics detector, with a 16 bit, 125 MS/s ADC. The sampled data are used to initiate the digital pulse processing sequence, managed in the FPGA at the firmware level. Different firmware types can be selected via software, according to the specific setup and acquisition mode.

  • Common trigger: all channels acquire simultaneously with a common trigger. The trigger can be fed externally or generated by a combination of individual channel discriminators. This mode is mainly intended for the acquisition of waveforms, like a digital oscilloscope. Options for zero suppression are available to remove not significant data.
  • Independent trigger: suited for trigger-less applications, where no global trigger is needed but each channel acquires waveforms upon its self-trigger which fires through a digital discriminator, independently of the others.
  • DPP: real-time processing in the FPGA allows for the extraction of physical parameters from the waveform (e.g. pulse height, charge, timestamp, PSD), well suited for high counting rate applications. It is yet possible to save both raw waves and parameters.

A template of the firmware is available for customers who want to personalize the acquisition to implement custom algorithms for pulse processing in the open FPGA. The user can have control of the data output information and customize the trigger logic to get several combinations of self-triggers and I/O signals to validate or discard the events.
Custom software can run on the onboard CPU for data reduction and analysis. Multi-board synchronization can be implemented via backplane or front panel easy-cabling options.
The communication interface selection offers fast readout options: USB 3.0 type-C and 1/10 Gigabit Ethernet.

For detailed information on available firmware for the 2745 family and the structure of programming files (.CUP), please refer to the following page.

Supported by the following third-party software*:

Technical Specifications

GENERAL

Weight: 3120 g
Form Factor: Desktop | Desktop Rack
Dimension: Desktop: 338 W x 100 H x 283 L mm³ (without connectors) | 338 W x 100 H x 295 L mm³ (including connectors). Desktop-Rack: 19″ rack mount

ANALOG INPUT

Channels: 64 channels, differential on 2745, single-ended on 2745B versions
Bandwidth (-3dB): 20 MHz guaranteed for all Gain settings
Impedance: differential: 100 Ω, single-ended: 50 Ω (10 kΩ personalization available)
ICMR (Input Common-Mode Range): ± 12 Vdc referred to Gnd (Differential mode only)
Full Scale Range: 4 Vpp ÷ 0.04 Vpp
Gain: x1 ÷ x100, software programmable in steps of 0.5dB independently on each 16-channel group
Connector Type: Four 2mm 40-pin header male; input adapters available
DC Offset: Adjustable in the ± 2.5V range independently on each channel

DIGITAL CONVERSION

Resolution: 16 bits
Sampling Rate: 125 MS/s simultaneously on each channel. Scalable by 2n decimation factor, n = 1 to 10 (Scope firmware only)

SYSTEM PERFORMANCE

ENOB: 12 @ 5MHz, -3dB, Gain = 1 (Typ.)
RMS: 3.6 LSB (≃ 110 µV) typical RMS @ Gain = 1

DIGITAL I/O
CLK-IN, CLK-OUT

  • Two differential pairs:
    o CLK, reference clock signal
    o SYNC, synchronization signal (start/stop, T0, etc.)
    2.54mm, 4-pin AMPMODU Mod II male connector
  • CLK-IN: AC-coupled LVDS, ECL, PECL, LVPECL, CML (Zdiff = 100 Ω)
  • CLK-OUT: LVDS
  • Daisy chainable for multiboard synchronization with sw programmable CLK-OUT delay shift
 LVDS I/O

  • 16 differential pairs
  • Software programmable I/O (individual self-trigger outputs, trigger validations, Veto, Busy, Start, Stop, Pattern Input, etc.)
    – LVDS
    – Zdiff = 100 Ω (when set as inputs)
    – 2.54mm 34-pin AMPMODU Mod II male connector
 TRG-IN/TRG-OUT/GPIO/S-IN

– General purpose I/Os
– Software programmable (trigger, gate, veto, busy, etc.)
– Sigle-ended TTL/NIM

  • TRG-IN/S-IN internally terminated with 50 Ω (Zin = 50 Ω)
  • TRG-OUT requires Rt = 50 Ω
  • GPIO as Input must be terminated with 50 Ω
  • GPIO as TTL Output requires Rt = 50 Ω
  • GPIO as NIM Output requires Rt = 50 Ω or 25 Ω

– LEMO 00 male connector

   
DAC OUT
  • DAC output for signal inspection, pulse generation, majority level
  • 14-bit Digital-to-Analog Converter (DAC)
  • 125 MS/s Update Rate
  • ±1 V @ 50 Ω load; ±2 V @ hi-Z load Output Range
  • LEMO-00 male connector
ACQUISITION MEMORY

2.5 GB total DDR4 memory size (20.971 MS/ch) divisible in multiple buffers
Maximum record length: ≃ 84 ms @ 125 MS/s (total memory size divided by 2)1

1 Value referred to the Scope firmware (minimum of two buffers admitted)

TRIGGER
Trigger Modes

  • Common: all channels acquire simultaneously with the trigger (software, external or logic combination of self-triggers)
  • Individual: each channel acquires independently with its self-trigger
  • Correlated: the individual self-trigger of each channel is validated by the coincidence/anticoincidence logic between other self-triggers and/or external I/Os
 Trigger Time Stamp

  • Resolution: 8 ns coarse time stamp, 8ps fine time stamp (DPP firmware only)
  • Counter range: 48 bits
  • Full-scale range: ~625 h
SYNCHRONIZATION
Clock Propagation

Typical 62.5MHz frequency optionally distributed:
• By fan-out to CLK-IN
• By CLK-IN/CLK-OUT daisy chain with sw programmable CLK-OUT delay shift
Custom frequencies can be supported on request

Acquisition Start/Stop

Daisy chain or fan-out propagation through CLK-IN/CLK-OUT or NIM/TTL, LVDS I/Os

 

 Data Sync 

Busy/Veto logic on LVDS I/Os or NIM/TTL I/Os for event building synchronization

Trigger Distribution

TRG-IN/TRG-OUT NIM/TTL LEMO I/Os (common trigger) or LVDS I/Os (common or individual trigger)

Trigger Time Stamp Reset

Software from START run command or Hardware from S-IN/GPIO input (Scope Firmware only)
FIRMWARE

Firmware stored in the on-board Flash Memory and live rebootable by Web Interface

DPP Firmware

Implements the digital pulse processing algorithm:

  • DPP-PHA: Pulse Height Analysis
  • DPP-QDC: Charge Integration
  • DPP-PSD: Pulse Shape Discrimination
  • DPP-ZLE: Zero Length Encoding
  • DPP-DAW: Dynamic Acquisition Window
 Scope Firmware

Firmware for the waveform recording

 Upgrades

Any supported firmware can be uploaded via Web Interface (both different firmware types and upgraded versions of the same firmware)

 

  
FPGA
  • Xilinx Zynq UltraScale+ Multiprocessor System-on-Chip mod. XCZU19EG
  • Processing System based on Quad-core Arm with 2GB DDR4 memory @2400 MT/s (Linux OS onboard)
  • Programmable logic with more than 1100K system logic cells and 80Mbit memory
OPEN FPGA
User-Scope Template

Common trigger, simultaneous waveform recording on 64 channels management. Trigger logic and wave processing customization

 User-DPP Template

Individual trigger and channel acquisition management. Customization of DPP algorithm, trigger logic, and event data information
COMMUNICATION INTERFACE
1 GbE

  • Copper RJ45 or optical LC connector on SFP+ transceiver
  • Protocol: TCP
  • Transfer rate: 110 MB/s

10 GbE (*)

  • Copper RJ45 or LC optical connector on SFP+ transceiver
  • Transfer rate: 850 MB/s

* Contact CAEN Support

  

USB 3.0

  • USB-C type connector
  • Protocol: USB 3.1 GEN1
  • Transfer rate: 280 MB/s
SOFTWARE
Readout SW

  • CoMPASS spectroscopy software (for DPP firmware only)
  • WaveDump2 (for Scope firmware only)

SDK and Tools
General purpose C libraries with demo samples for host Windows® and Linux® PC, and embedded Arm processor

 SCI-Compiler (Open FPGA)
Automatic generation of drivers (USB, ethernet), libraries, and demo software for Windows®, Linux®Web Interface
Firmware management (e,g. upgrades and on-the-fly selection of the firmware to run), board information, PLL and Ethernet configuration, board status monitoring
POWER REQUIREMENTS

Mains-powered (130 Watt @110V/220V).

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Ordering Options

Code Description
WDT2745BXAAA DT2745B - 64 Ch. 16 bit 125 MS/s Digitizer with Programmable Input Gain, SE   RoHS
WDT2745XAAAA DT2745 - 64 Ch. 16 bit 125 MS/s Digitizer with Programmable Input Gain, Diff   RoHS

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