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VX1730 / VX1730S

16/8 Channel 14 bit 500 MS/s Digitizer

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Overview

The VX1730S is a digitizer capable of recording waveforms along with performing advanced algorithms for online digital pulse processing (DPP) (Free Trial). Utilizing DPP Firmware, users can acquire quantitative physical parameters (Integrated Charge, Pulse Shape Discrimination with very fine time resolution, Pulse Height Analysis) as well as read out waveforms with automatic pulse identification and baseline suppression on channel basis (Zero-Length Encoding and Dynamic Acquisition Window). The wide range of DPP algorithms supported by the VX1730S make it a “must-have” for any type of nuclear physics application.

The VX1730S (previously VX1730) has also been upgraded, introducing a larger FPGA to accommodate more complex DPP algorithms and a new A/D converter for better stability which does not require temperature-related calibration.

Input signals are read by a Flash ADC, 14-bit resolution and 500 MS/s sampling rate, which is well suited for mid fast signals as the ones coming from liquid or inorganic scintillators coupled to PMTs or Silicon Photomultipliers, but also for high precision detectors as Silicon or HPGe coupled with charged sensitive preamplifier. The acquisition can be channel independent and it is possible to make coincidence /anti-coincidence logic among different channels and external veto/gating. Multiple boards can be synchronized to build up complex systems. In the case of DPP mode, data can be saved in time-stamped list mode to support higher input rates and improving the throughput performances. Piled-up events can be rejected or saved for offline analysis. The acquisition in DPP mode is fully controlled by the CoMPASS and MC2Analyzer software, which manage the algorithm parameters, build the plots and saves the relevant energy, time, and PSD spectra. In the case of waveform recording mode, the user can take advantage of the CAENScope and WaveDump software to access and save the waveforms. Libraries and demo software in C and LabView are available for integration and customization of specific acquisition systems.

The VX1730S comes in a VME64X form factor, with 16/8 input channels. The communication to and from the board is provided through the VMEBus and Optical Link interfaces.

The VX1730 fits in the single-slot CAEN VME64X u-crate, which allows you to convert the VME digitizer into a desktop board for lab tests.

Technical Specifications

GENERAL
Form Factor
1-unit wide, 6U VME64X
Weight
440 g (8 ch), 540 g (16 ch)
ANALOG INPUT
Channels
16/8 channels single ended

Impedance
50 Ω
Connector
MCX

Full Scale Range
0.5 or 2 Vpp
(SW selectable)
Bandwidth
250 MHz

Offset
Programmable DAC for DC offset adjustment in the full scale range
DIGITAL CONVERSION
Resolution
14 bits
Sampling Rate
500 MS/s
Simultaneously on each channel
SYSTEM PERFORMANCES

VX1730SX Baseline RMS Noise (open inputs)
@ 2 Vpp: 2.6 LSB = 312 uV
@ 0.5 Vpp: 3.4 LSB = 102 uV

ADC CLOCK GENERATION
  • Clock source: internal/external
  • Onboard programmable PLL provides generation of the main board clocks from an internal (50 MHz local Oscillator) or external (front panel CLK-IN connector) reference
DIGITAL I/O
CLK-IN (AMP Modu II)
AC coupled differential input clock LVDS, ECL, PECL, LVPECL, CML (single ended NIM/TTL available by CAEN adapter)
Jitter < 100 ppm requested

CLK-OUT (AMP Modu II)
DC coupled LVDS output clock for multi-board synchronization
TRG-OUT (LEMO)
Local trigger digital output
NIM/TTL, Rt = 50 Ω



TRG-IN (LEMO)
External trigger digital input
NIM/TTL, Zin = 50 Ω
S-IN (LEMO)
SYNC/START front panel digital input
NIM/TTL, Zin = 50 Ω
ACQUISITION MEMORY

640 kS/ch (1.25 ms @ 500 MS/s) or 5.12 MS/ch (10 ms @ 500 MS/s) Multi-event Buffer divisible into 1 ÷ 1024 buffers
Independent read and write access
Programmable event size and pre/post-trigger

TRIGGER
Trigger Source
Self-trigger: channel over/under threshold for either Common or Individual (DPP only) trigger generation
External-trigger: Common by TRG-IN connector
Software-trigger: Common by software command

Trigger Propagation
GPO digital output
Trigger Time Stamp
Waveform Recording: 31-bit counter, 16 ns resolution, 17 s range; 48-bit extension by firmware
DPP-PSD: 47-bit counter, 2 ns resolution, 78 h range; 10-bit and 2 ps fine time stamp with digital CFD
DPP-PHA: 47-bit counter, 2 ns resolution, 78 h range
DPP-DAW: 48-bit counter, 2 ns resolution, 156 h range
DPP-ZLEplus: 48-bit counter, 16 ns resolution, 625 h range
SYNCHRONIZATION
Clock Propagation
Daisy chain: CLK-IN/CLK-OUT connectors
One-to-many: clock distribution from DT4700 on CLK-IN connector
Clock Cable delay compensation
Acquisition Synchronization
Sync Start/Stop through digital I/O (S-IN or TRG-IN input, TRG-OUT output)
Trigger Time Stamp Alignment
By S-IN input connector
ADC & MEMORY CONTROLLER FPGA

Altera Cyclone EP4CE30 (one FPGA serves 4 channels)

ANALOG MONITOR
  • 12-bit/125 MHz DAC FPGA controlled output with four operating modes:
  • Test pulses: 1 Vpp ramp generator
  • Majority signal: proportional to the no. of channels under/over the threshold (steps of 125 mV)
  • Memory Occupancy signal: proportional to the Multi-Event Buffer Occupancy (1 buffer ~ 1mV)
  • Voltage level: programmable output voltage level
LVDS I/O
  • 16 general purpose LVDS I/Os controlled by FPGA
  • Busy, Data Ready, Memory Full, Individual Trg-Out and other functions can be programmed
  • An Input Pattern from the LVDS I/Os can be associated to each trigger as an event marker
COMMUNICATION INTERFACE
VME
VME64X compliant
Data transfer mode: BLT32, MBLT64 (70 MB/s using CAEN Bridge), CBLT32/64, 2eVME, 2eSST (up to 200 MB/s)
Optical Link
CAEN CONET proprietary protocol, up to 80 MB/s transfer rate
Daisy chainable: it is possible to connect up to 8/32 ADC modules to a single Optical Link Controller (Mod.A2818/A3818)
FIRMWARE
Waveform Recording Firmware
Free firmware for waveform recording

Upgrades
Firmware can be upgraded via Optical Link or VMEBus
DPP Firmware
Paid firmware for Digital Pulse Processing: DPP-PSD, DPP-PHA, DPP-ZLEplus, and DPP-DAW
POWER CONSUMPTIONS
VX1730: 8.2 A @ +5 V; 840 mA @ +12 V; -12 V not used
VX1730B: 10.2 A @ +5 V; 840 mA @ +12 V; -12 V not used
VX1730C: 5 A @+5V; 400 mA @+12V; 400 mA @-12V (ref. PCB rev. 0)
VX1730D: 6.5 A @+5V; 400 mA @+12V; -400 mA @-12V (ref. PCB rev. 0)
VX1730SD: 6.3 A @ +5 V; 400 mA @ +12 V; -12 V not used
Vx1730S: 9.3 A @ +5V; 900 mA @ +12V; -12 V not used
VX1730SB: 11.5 A @ +5V; 800 mA @ +12V; -12 V not used
VX1730SC: 5.3 A @ +5V; 500 mA @ +12V; -12 V not used

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Accessories

A654
Cable assembly LEMO 00 male to MCX male – 1 m
A659
Cable assembly BNC male to MCX male – 1 m
AI2700
Optical Fiber Series
A317
Cable assembly for Clock distribution 3-pin AMPMODU IV female terminations – 18 cm / 25cm
A318
Adapter for Clock signal FISCHER S101A004 male to 3-pin AMPMODU IV female – 10 cm
A316
Cable assembly 2.54mm 2-pin header female - 5 cm
A952
Cable assembly 2.54mm 34 pin female to 2.54mm 34 pin female - 50 cm
A953
Cable assembly 2.54mm 34 pin female to two 2.54mm 34 pin female – 50 cm
A954
Cable assembly 2.54mm 34 pin female to two 2.54mm 16 pin female - 50 cm

Ordering Options

Code Description
WVX1730BXAAA VX1730B - 16 Ch. 14 bit 500 MS/s Digitizer: 5.12MS/ch, CE30, SE  (Obsolete) RoHS
WVX1730CXAAA VX1730C - 8 Ch. 14 bit 500 MS/s Digitizer: 640kS/ch, CE30, SE  (Obsolete) RoHS
WVX1730DXAAA VX1730D - 8 Ch. 14 bit 500 MS/s Digitizer: 5.12MS/ch, CE30, SE  (Obsolete) RoHS
WVX1730XAAAA VX1730 - 16 Ch. 14 bit 500 MS/s Digitizer: 640kS/ch, CE30, SE  (Obsolete) RoHS
WVX1730SBXAA VX1730SB - 16 Ch. 14 bit 500 MS/s Digitizer: 5.12MS/ch, Arria V GX, SE   RoHS
WVX1730SCXAA VX1730SC - 8 Ch. 14 bit 500 MS/s Digitizer: 640kS/ch, Arria V GX, SE   RoHS
WVX1730SDXAA VX1730SD - 8 Ch. 14 bit 500 MS/s Digitizer: 5.12MS/ch, Arria V GX, SE   RoHS
WVX1730SXAAA VX1730S - 16 Ch. 14 bit 500 MS/s Digitizer: 640kS/ch, Arria V GX, SE   RoHS

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