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N6781

Dual/Quad Digital Multi Channel Analyzer - NIM
The N6781 is a a 1-unit wide standard NIM module integrating 4 Independent 16k Digital MCA for digital nuclear Spectroscopy. A version with 2 independent 16k MCA is also available (N6781A). It is ideally suited for high energy resolution semiconductor detectors, like HPGe and Silicon, connected to a Charge Sensitive Preamplifier (CSP) but it can also properly work directly connected to a PMT with inorganic scintillators (Nal, Csl) and other types of crystal, provided that the pulse shape is exponential and the decay time is long enough (typ. > 200 ns).

The module houses:
  • 4x (or 2x) 100 MS/s 14-bit waveform digitizer (based on 724 series) on single-ended inputs with BNC connectors, featuring 4-step software configurable input range and adjustable DC offset via a 16-bit DAC on each input in the full range.

The N6781 is equipped with a FPGA featuring the real-time Digital Pulse Processing for Pulse Height Analysis (DPP-PHA firmware) making the module a spectroscopy acquisition system providing energy (i.e. pulse height) and timing information as well as waveforms and internal signals for debugging, monitoring and pulse shape analysis.

Thanks to its two independent inputs of simultaneous acquisition, the N6781 is able to manage coincidences and anticoincidences between a pair of detectors, allowing the user, for example, to easily take advantage of background rejection or anti-Compton techniques.
The module has been designed to operate as a scalable multi-input, multi-board acquisition system, offering synchronization capabilities.

The N6781 houses USB 2.0 and Optical Link interfaces. USB 2.0 allows data transfers up to 30 MB/s. The Optical Link supports transfer rate of 80 MB/s and offers Daisy-chain capability. Therefore, it is possible to connect up to 8/32 MCA modules to a single Optical Link Controller (Mod. A2818/A3818).

Operating modes:
  • "Pulse Height Analysis (PHA)": pulse height histogram (1k-2k-4k-8k-16k) built at software level
  • "List mode": pulse height and time stamp for each event
  • "Oscilloscope" mode: input and internal filters waveforms
Software available (Windows and Linux):
CAEN provides drivers for all the different types of physical communication channels, a set of C and LabView libraries (CAENComm, CAENDigitizer, CAENDPP(NEW!)), demo applications and utilities:
  • CAENUpgrader: tool that allows the user to update the firmware of the digitizers, change the PLL settings, load, when requested, the license for the pay firmware and other utilities.
  • DPP-PHA Control Software: graphical interface for the DPP-PHA management with any model of the CAEN digitizer in the 724 series and the DT5780.
  • MC˛ Analyzer (NEW!): Digital MCA Data Acquisition and Analysis Software designed for CAEN Digital Multi Channel Analyzers and Digitizers running Pulse Height Analysis. (Windows only)


Mechanical
Dimensions
1-unit wide NIM
Weight
1000 g (N6781 version)
Analog Input
Input Features
-
BNC connector
-
Single-ended, DC coupled
-
Impedance: 1 kΩ
-
Positive and negative signals accepted
-
Programmable 4-step analog coarse gain corresponding to
0.3Vpp-1Vpp-3Vpp-10Vpp ranges
-
Bandwidth: DC to 5 MHz
-
Programmable DC offset adjustment on each input in the full scale range
Number of Inputs
4 inputs: DT5781
2 inputs: DT5781A
ADC
Resolution: 14 bits
Sampling rate: 100 MS/s simultaneously on each channel
Digital Signal Processing
-
Trapezoidal filter for the energy calculation with adjustable rise time in the range 0 - 10µs and flat top in the range 0 - 5µs
-
Manual and automated trigger threshold adjustment
-
Manual and automated Pole-Zero cancellation; decay time up to 6.5 ms
-
Digital decimation in steps of 2-4-8 allows to extend the time parameters range
-
Digital fine gain
-
Pile-up rejection and Live Time correction
-
Baseline restorer with programmable averaging
-
Trigger and Timing filter based on integrative-derivative component
-
Time Stamp: 10 ns resolution, 31 bit and rollover tracking event
-
Adjustable moving average low pass filter to reduce the high frequency noise
Operating Modes
-
Pulse Height Analysis (PHA): pulse height histogram (1k-2k-4k-8k-16k) built at software level
-
List mode: pulse height and time stamp for each event
-
Oscilloscope mode: input and internal filters waveforms
Trigger Modes
-
Uncorrelated: each channel operates independently (based on channel self-trigger)
-
Correlated: coincidence/anticoincidence among channels and/or an external trigger (TRG-IN)
-
External: channels are triggered by external trigger only (TRG-IN)
Front Panel Digital I/O
CLK-IN (AMP Modu II)
AC coupled differential Input Clock: LVDS, ECL, PECL, LVPECL, CML (single ended NIM/TTL available by orderable cable); Jitter<100ppm requested; can be used as external clock reference for single board or to synchronize the clocks of multiple boards, provided through a Fan In
GPO (LEMO)
General Purpose Output: NIM/ TTL, Zin = 50 Ω
Can be used to propagate the global trigger in multi-board synchronization (in combination with TRG-IN), as output register or Run ON/OFF status

TRG-IN (LEMO)
External Trigger Input: NIM/TTL, Zin = 50 Ω
Can be used to force the event acquisition from all the channels of the board, to gate/veto the individual channel triggers, or to propagate the common trigger in multi-board synchronization (in combination with GPO)
GPI (LEMO)
General Purpose Input: NIM/TTL, Zin = 50 Ω
Can be used as SYNC/START in multi-board synchronization or Run ON/OFF Control
Communication interface
Optical Link
CAEN CONET proprietary protocol Up to 80 MB/s transfer rate Daisy chain capability: it is possible to connect up to 8 or 32 ADC modules to a single Optical Link Controller (A2818 or A3818 respectively)
USB
USB 2.0 compliant
Up to 30 MB/s transfer rate
Firmware Firmware can be upgraded via USB/Optical Link
Software Fully controlled by DPP-PHA Control Software and the MC˛ Analyzer spectroscopy Software
For developers: general purpose C libraries with demo samples available
Power
Requirements
N6781 (Typ.)
3.3 A ± 10% @ +6 V
100 mA ± 10% @ -6 V
280 mA ± 10% @ +12 V
N6781A
t.b.d.
Environmental Operational Conditions
0 - 50°C Temperature Range - EMC compliant
Description Release Date OS-Version Environment Download
Driver
Windows DT57xx-N67xx-DT55xx Win32 USB Driver(a) 3.4.9 July, 2016 7/8/8.1/10 (32-bit)
Drivers 32.5 KB - Type: .zip Download
Windows DT57xx-N67xx-DT55xx Win64 USB driver 3.4.9 July, 2016 8.1/10 (64-bit)
Drivers 34.61 KB - Type: .zip Download
Windows DT57xx-N67xx-DT55xx Win7_8_x64 USB driver 3.4.9 July, 2016 7/8 (64-bit)
Drivers 35.67 KB - Type: .zip Download
Linux DT57xx-N67xx-DT55xx-V1718-N957 Linux USB Driver 1.5.1 August, 2015
Release Notes 4.14 KB - Type: .txt Download
Drivers (Linux kernel 2.6 - 3.x) 8.24 KB - Type: .tgz Download
 
Firmware CONET2 Compliant
Firmware   x724 - xx78x DPP-PHA FW CONET 2 Compliant 4.5_128.30 Feb, 2015
FW Package 1.37 MB - Type: .cfa Download
Release Notes 7.2 KB - Type: .txt Download

Related Models
Family Name Description
Digitizer Software CAENUpgrader Firmware Upgrade Tool for Front-end Boards Bridges & VME Power Supply
Digitizer Software DPP-PHA Control Software Software interface for DPP-PHA management
Digitizer Software CAEN DeskBoot Firmware Boot Controller for Front-End NIM and Desktop Digitizers
Digitizer Software CAENDPP Library High level library for CAEN boards running DPP firmware
Digitizer Software MC˛Analyzer Digital MCA Data Acquisition and Analysis Software

Notes

  • (a) IMPORTANT!
    DT57xx-N67xx-DT55xx Win32 USB Driver rel. 3.4.7 or above:
    - requires installation of Windows CAENVMELib library rel. 2.4 or above
    - does not work with: CAEN WaveDump rel . < 3.5.0; CAENUpgrader rel. < 1.3.0: DPP-PHA Control Software rel. < 1.1.0; DPP-PSD Control Software rel. < 1.1.0
Code Description
WN6781AXAAAA N6781A - Dual Digital MCA
WN6781XAAAAA N6781 - Quad Digital MCA
Model Package Function Description Compare
All - Reset
DT5770 Digital Multichannel Analyzers Multi Channel Analyzers Digital Multi Channel Analyzer - Desktop
DT5780 Digital Multichannel Analyzers Multi Channel Analyzers Dual Digital Multi Channel Analyzer (HV & Preamplifier PS) - Desktop
DT5781 Digital Multichannel Analyzers Multi Channel Analyzers Dual/Quad Digital Multi Channel Analyzer - Desktop
Gamma stream Digital Multichannel Analyzers Multi Channel Analyzers Digital MCA Tube Base for Gamma-Ray Spectroscopy
N1728A NIM Multi Channel Analyzers 4 Ch. 14 bit 100 MS/s Digitizer with Pulse Shape Analysis (Differential Inputs)
N1728B NIM Multi Channel Analyzers 4 Ch. 14 bit 100 MS/s Digitizer with Pulse Shape Analysis (Single Ended Inputs)
N6780 Digital Multichannel Analyzers Multi Channel Analyzers Dual Digital Multi Channel Analyzer (HV & Preamplifier PS) - NIM
N6781 Digital Multichannel Analyzers Multi Channel Analyzers Dual/Quad Digital Multi Channel Analyzer - NIM
N957 NIM Multi Channel Analyzers 8k Multi-Channel Analyzer
Manuals Last Update
UM3189 - N6781 Dual/Quad Digital MCA User Manual 03 February, 2015
UM3182 - DPP-PHA and MC2Analyzer User Manual 26 January 2015
DPP-PHA Registers Description 26 January 2015

Precautions for Handling Storage and Installation

Application Notes Last Update
The aim of this application note is to show the principles of operation and the results obtained in high resolution gamma spectroscopy using CAEN Digital Pulse Height Analyser, a dedicated system based on 724 digitizers and DPP-PHA firmware. AN2508 - CAEN Digital Pulse Height Analyser a digital approach to Radiation Spectroscopy 05 September, 2011
Slide Presentations Last Update
SP5148 - Digital systems for Multi-Parametric analysis in Physics Applications (India - March 2016) March, 2016
Guides Last Update
The purpose of this guide is to facilitate customer's approach to CAEN Desktop Digitizers and Digital MCA providing the main guidelines to a first usage, allowing him to familiarize with the hardware, to set up the hardware, to set up the USB drivers and to set up a first connection and communicate between the host station and the board. GD2783 - First Installation Guide to Desktop Digitizers & MCA 21 July, 2016
This QuickStart Guide contains the basic information and guidelines that will let you use DeskBoot program in few steps. DeskBoot is a C-based software utility managing the boot of the firmware for CAEN's NIM and Desktop digitizers (including the DT5780 Digital Multi Channel Analyzer). GD2812 - DeskBoot QuickStart Guide 12 June, 2013
This guide wants to provide detailed instructions on how to make coincidences with CAEN digitizers series 720, 750 and 724 equipped with Digital Pulse Processing (DPP) firmware. GD2827 - How to make coincidences with CAEN digitizers 04 July, 2016
Brochures, Flyers Last Update
This Brochure describes the 781 Digital MCA Family:The 781 Family is a new Family of compact Dual/Quad Digital 16k MCA for nuclear spectroscopy. Available in Desktop and NIM form factor, it is ideally suited for high energy resolution semiconductor detectors, like HPGe and Silicon, connected to a Charge sensitive Premplifier (ADOCUME00114) BF3266 - 781 Dual/Quad Digital MCA Family Flyer March, 2016
White Paper Last Update
This White Paper explains the possibilities offered by Digital Pulse Processing algorithms in Nuclear Physics applications: Pulse Triggering and Timing Filters, Pulse Height Analysis (DPP-PHA - Digital MCA), Charge Integration (DPP-CI - Digital QDC), Pulse Shape Discrimination (DPP-PSD - Neutron/gamma Discrimination), Time measurements. WP2081 - Digital Pulse Processing in Nuclear Physics 26 August, 2011

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