VX1751

4/8 Input Channel 10 bit 2/1 GS/s Digitizer

Home Modular Pulse Processing ElectronicsAnalogDigitizers VX1751

10 bit 1 GS/s (2 GS/s in DES mode) ADC
FPGA for real-time data processing:
- Pulse Shape Discrimination (DPP-PSD)
- Zero Length Encoding (DPP-ZLEplus)
8 input channels (4 in DES mode), single-ended
1 Vpp input range (default); 0.2 Vpp customization by ordering option
16-bit programmable DC offset adjustment in the full range independently on each channel
Trigger Time stamps
Multi-Event Memory buffer: 1.835 MS/ch (3.6 MS/ch in DES mode) or 14.4 MS/ch (28.8 MS/ch in DES mode) divisible into 1 ÷ 1024 buffers
Programmable event size and pre-post trigger adjustment
Analog Sum/Majority and digital over/under threshold flags for Global Trigger logic
Front panel clock input/output available for multiboard synchronization (direct feed through or PLL-based synthesis)
16 programmable LVDS I/Os
Optical Link interface (CONET proprietary protocol) Daisy-chainable through A5818 (PCIe Gen 3) Controller or A4818 (USB3-to-CONET)
VME64X interface
Firmware upgradeable via VME/Optical Link
Fully supported by CoMPASS and WaveDump2 software

The CAEN Mod. VX1751 is a Waveform Digitizer, in VME64X form factor, housing 8 Input Channel 10 bit 1 GS/s Flash ADC, designed for waveform recording and supporting advanced algorithms for online digital pulse processing (DPP) making charge integration and pulse shape discrimination (PSD), and data reduction by zero-length encoding (ZLEplus). If the DES mode* (Dual Edge Sampling) is enabled, this device becomes a 4 input channel 10 bit 2 GS/s Waveform Digitizer.

The Digitizer is well suited for fast signals as the ones coming from fast organic, inorganic and liquid scintillators coupled to PMTs or Silicon Photomultipliers, Diamond detectors and others. 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, users can acquire quantitative physical parameters (Time, Integrated Charge, Pulse Shape Discrimination with very fine time resolution) as well as read out waveforms with baseline suppression on channel basis (Zero-Length Encoding) The acquisition in DPP-PSD mode is fully controlled by the CoMPASS software, which manages the algorithm parameters, builds, plots and saves the relevant energy, time, and PSD spectra. In the case of waveform recording mode, the user can take advantage of the WaveDump and WaveDump2 software to access and save the waveforms. A C-based demo is provided to configure the algorithm parameters, control the data acquisition, saving, and plotting for the DPP-ZLEPlus mode.

Libraries and demo software in C, Phyton, and LabView are available for integration and customization of specific acquisition systems.
The communication to and from the board is provided through the VMEBus and Optical Link interfaces.

(*) NOTE: DES mode is not available with DPP firmware

Note: VX1751 can be operated with VME8004X/ VME8008X /VME8100 / VME8200/μ-crate.

Ordering Options

Code	Description
WVX1751BXAAA	VX1751B – 4/8 Ch. 10 bit 2/1 GS/s Digitizer: 3.6/1.8MS/ch, EP3C16, DIFF (Obsolete)
WVX1751CXAAA	VX1751C – 4/8 Ch. 10 bit 2/1 GS/s Digitizer: 28.8/14.4MS/ch, EP3C16, SE	RoHS
WVX1751XAAAA	VX1751 – 4/8 Ch. 10 bit 2/1 GS/s Digitizer: 3.6/1.8MS/ch, EP3C16, SE	RoHS

Code

Description

WVX1751BXAAA

VX1751B – 4/8 Ch. 10 bit 2/1 GS/s Digitizer: 3.6/1.8MS/ch, EP3C16, DIFF

(Obsolete)

WVX1751CXAAA

VX1751C – 4/8 Ch. 10 bit 2/1 GS/s Digitizer: 28.8/14.4MS/ch, EP3C16, SE

RoHS

WVX1751XAAAA

VX1751 – 4/8 Ch. 10 bit 2/1 GS/s Digitizer: 3.6/1.8MS/ch, EP3C16, SE

RoHS

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Image	Name	Package	No. of Channels	Max Sampling Rate (MS/s)	Bandwidth (MHz)	Full Scale Range (V)	Resolution (bits)	Board Memory (Samples/ch)	Analog Input Connectors	CAEN firmware	Open FPGA
	V1725 / V1725S	VME	8 / 16	250	125	0.5 - 2	14	640 k / 5.12 M	MCX	DPP-PHA, DPP-PSD, DPP-ZLEplus, D-WAVE	NO
	DT2745	Desktop	64	125	20	[0.04 + 4]	16	21 M	2mm 40-pin header male	DPP-PHA, DPP-PSD, D-SCOPE, DPP-ZLEplus<sup>(cs)</sup>	YES
	New R5560	rack mount 19 -2U	128+6	125	60	2	14	max. 8k	RJ45	n. a.	YES
	New DTL2730	Desktop	8	500	TBD	TBD	14	TBD	MCX	DPP-PHA(cs), DPP-PSD(cs), D-SCOPE(cs)	YES
	V1761	VME	2	4000	1000	1	10	7.2 M / 57.6 M	MCX	D-WAVE	NO
	DT5751	Desktop	2(DES mode) - 4	2000(DES mode) - 1000	500	0.2 / 1	10	3.6 M(DES mode) - 1.8 M	MCX	DPP-PSD, DPP-ZLEplus, D-WAVE	NO
	VX1740D	VME64X	64	62.5	30	2 / 10	12	192 k	SMC 68P	DPP-QDC, D-WAVE	NO
	DT5725 / DT5725S	Desktop	8	250	125	0.5 - 2	14	640 k / 5.12 M	MCX	DPP-PHA, DPP-PSD, DPP-ZLEplus, DPP-DAW, D-WAVE	NO
	VX1724	VME64X	8	100	40	0.5 / 2.25 / 10	14	512 k / 4 M	MCX	DPP-PHA, DPP-DAW	NO
	DT5761	Desktop	1	4000	1000	1	10	7.2 M	MCX	D-WAVE	NO
	VX2745	VME64X	64	125	20	[0.4 ÷ 4]	16	21 M	2mm 40-pin header male	D-SCOPE, DPP-PHA, DPP-PSD, DPP-ZLEplus<sup>(cs)</sup>	YES
	DT5724	Desktop	4 / 2	100	40	0.5 / 2.25 / 10	14	512 k / 4 M	MCX	DPP-PHA, DPP-DAW, D-WAVE	NO
	DT5730 / DT5730S	Desktop	8	500	250	0.5 - 2	14	640 k / 5.12 M	MCX	DPP-PHA, DPP-PSD, DPP-ZLEplus, DPP-DAW, D-WAVE	NO
	VX2740	VME64X	64	125	50	2	16	21 M	2mm 40-pin header male	DPP-PHA, D-SCOPE, DPP-PSD, DPP-ZLEplus<sup>(cs)</sup>	YES
	V1724	VME	8	100	40	0.5 / 2.25 / 10	14	512 k / 4 M	MCX	DPP-PHA, DPP-DAW, D-WAVE	NO
	VX1761	VME64X	2	4000	1000	1	10	7.2 M / 57.6 M	MCX	D-SCOPE	NO
	DT2740	Desktop	64	125	50	2	16	21 M	2mm 40-pin header male	DPP-PHA, DPP-PSD, D-SCOPE, DPP-ZLEplus<sup>(cs)</sup>	YES
	V2740	VME	64	125	50	2	16	21 M	2mm 40-pin header male	DPP-PHA, DPP-PSD, D-SCOPE, DPP-ZLEplus<sup>(cs)</sup>	YES
	New DT2751	Desktop	16	1000	500	[0.2 ÷ 2]	14	84 M	MCX	DPP-PHA, DPP-PSD, D-SCOPE<sup>(cs)</sup>	YES
	V1730 / V1730S	VME	8 / 16	500	250	0.5 - 2	14	640 k / 5.12 M	MCX	DPP-PHA, DPP-PSD, DPP-ZLEplus, D-WAVE	NO
	N6725 / N6725S	NIM	8	250	125	0.5 - 2	14	640 k / 5.12 M	MCX	DPP-PHA, DPP-PSD, DPP-ZLEplus, DPP-DAW, D-WAVE	NO
	New VX2751	VME64X	16	1000	500	[0.2 ÷ 2]	14	84 M	MCX	DPP-PHA, DPP-PSD, D-SCOPE<sup>(cs)</sup>	YES
	VX1740	VME64X	64	62.5	30	2 / 10	12	192 k / 1.5 M	SMC 68P	D-WAVE	NO
	DT5740D	Desktop	32(SMC conn.) - 16(MCX conn)	62.5	30	2 / 10	12	192 k	SMC 68P - MCX	DPP-QDC,D-WAVE	NO
	V2745	VME	64	125	20	[0.04 + 4]	16	21 M	2mm 40-pin header male	DPP-PHA, DPP-PSD, D-SCOPE, DPP-ZLEplus<sup>(cs)</sup>	YES
	DT5742	Desktop	16 + 1	5000 (Based on DRS4 chip: 5 GS/s Switched Capacitor Array)	500	1	12	0.128 / 1	MCX	D-WAVE	NO
	VX1725 / VX1725S	VME64X	8 / 16	250	125	0.5 - 2	14	640 k / 5.12 M	MCX	DPP-PHA, DPP-PSD, DPP-ZLEplus, DPP-DAW, D-WAVE	NO
	VX2730	VME64X	32	500	250	[0.2 ÷ 4]	14	84 M	MCX	DPP-PHA, DPP-PSD, D-SCOPE<sup>(cs)</sup>	YES
	VX1730 / VX1730S	VME64X	8 / 16	500	250	0.5 - 2	14	640 k / 5.12 M	MCX	DPP-PHA, DPP-PSD, DPP-ZLEplus, DPP-DAW, D-WAVE	NO
	V2730B	VME64	16	500	250	[0.2 ÷ 4]	14	MCX	84 M	DPP-PHA, DPP-PSD, D-SCOPE(cs)	YES
	N6730 / N6730S	NIM	8	500	250	0.5 - 2	14	640 k / 5.12 M	MCX	DPP-PHA, DPP-PSD, DPP-ZLEplus, DPP-DAW, D-WAVE	NO
	V1743	VME	16	3200 (Based on SAMLONG chip: 3.2 GS/s Switched Capacitor Array)	500	2.5	12	0.007 M	MCX	D-WAVE	NO
	VX1751	VME64X	2(DES mode) - 4	2000(DES mode) - 1000	500	0.2 / 1	10	3.6 M(DES mode) - 1.8 M / 28.8 M(DES mode) - 14.4 M	MCX	DPP-PSD, DPP-ZLEplus, D-WAVE	NO
	DT5740	Desktop	32(SMC conn.) - 16(MCX conn)	62.5	30	2 / 10	12	192 k	SMC 68P - MCX	D-WAVE	NO
	V1720	VME	8	250	125	2	12	1.25 M / 10 M	MCX	DPP-PSD, D-WAVE	NO
	V1751	VME	2(DES mode) - 4	2000(DES mode) - 1000	500	0.2 / 1	10	3.6 M(DES mode) - 1.8 M / 28.8 M(DES mode) - 14.4 M	MCX	DPP-PSD, DPP-ZLEplus, D-WAVE	NO
	VX1742	VME64X	32 + 2	5000 (Based on DRS4 chip: 5 GS/s Switched Capacitor Array)	500	1	12	0.128 / 1	MCX	D-WAVE	NO
	DT5743	Desktop	8	3200 (Based on SAMLONG chip: 3.2 GS/s Switched Capacitor Array)	500	2.5	12	0.007 M	MCX	D-WAVE	NO
	DT5720	Desktop	4 / 2	250	125	2	12	1.25 M / 10 M	MCX	DPP-PSD, D-WAVE	NO
	V1742	VME	32 + 2	5000 (Based on DRS4 chip: 5 GS/s Switched Capacitor Array)	500	1	12	0.128 / 1	MCX	D-WAVE	NO
	DT2730	Desktop	32 / 16	500	250	[0.2 ÷ 4]	14	MCX	84 M	DPP-PHA, DPP-PSD, D-SCOPE	YES
	VX1743	VME64X	16	3200 (Based on SAMLONG chip: 3.2 GS/s Switched Capacitor Array)	500	2.5	12	0.007 M	MCX	D-WAVE	NO
	V1740D	VME	64	62.5	30	2 / 10	12	192 k	SMC 68P	DPP-QDC, D-WAVE	NO
	New DTL2751	Desktop	4	1000	TBD	TBD	14	MCX	TBD	DPP-PSD(cs), D-SCOPE(cs)	YES
	VX1720	VME64X	8	250	125	2	12	1.25 M / 10 M	MCX	DPP-PSD, D-WAVE	NO
	N6742	NIM	16 + 1	5000 (Based on DRS4 chip: 5 GS/s Switched Capacitor Array)	500	1	12	0.128 / 1	MCX	D-WAVE	NO

Image	Name	Package	No. of Channels	Max Sampling Rate (MS/s)	Bandwidth (MHz)	Full Scale Range (V)	Resolution (bits)	Board Memory (Samples/ch)	Analog Input Connectors	CAEN firmware	Open FPGA
	DT5751	Desktop	2(DES mode) - 4	2000(DES mode) - 1000	500	0.2 / 1	10	3.6 M(DES mode) - 1.8 M	MCX	DPP-PSD, DPP-ZLEplus, D-WAVE	NO
	VX1751	VME64X	2(DES mode) - 4	2000(DES mode) - 1000	500	0.2 / 1	10	3.6 M(DES mode) - 1.8 M / 28.8 M(DES mode) - 14.4 M	MCX	DPP-PSD, DPP-ZLEplus, D-WAVE	NO
	V1751	VME	2(DES mode) - 4	2000(DES mode) - 1000	500	0.2 / 1	10	3.6 M(DES mode) - 1.8 M / 28.8 M(DES mode) - 14.4 M	MCX	DPP-PSD, DPP-ZLEplus, D-WAVE	NO

GENERAL

Weight: 535 g
Form Factor: 1-unit wide VME64X
Dimension: 6U x 160 mm

ANALOG INPUT

Number of Inputs: 8/4, single-ended, DC coupled
Bandwidth (-3dB): 500 MHz
Impedance: 50 Ω
Gain: x1, fixed
Connector Type: MCX
Full Scale Range: 1 Vpp default; 0.2 Vpp customization by ordering option
16-bit programmable DC offset adjustment in the full range independently on each channel
Abs. Max. Voltage Rating:
- 3 Vpp @1 Vpp (with Vrail max +3 V or –3 V for any DAC offset value)
- 2 Vpp @0.2 Vpp (with Vrail max +2 V or –2 V for any DAC offset value)

DIGITAL CONVERSION

Resolution: 10 bits
Sampling Rate:
- 1 GS/s simultaneously on each channel (default)
- 2 GS/s in DES mode (half channels supported)
- Down to 250 MS/s by hardware downsampling (AN6308)

SYSTEM PERFORMANCES

ENOB: 9.04 (56 kS Buffer)
SINAD: 56.19 dB
THD: 70.2 dB
SFDR: 79.7 dB
SIGMA: 0.58 LSB rms (56 kS buffer, open input)

DIGITAL I/O

LVDS I/O	TRG-IN/TRG-OUT/S-IN
16 differential pairs Sw programmable I/O function (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	General-purpose digital I/Os Sigle-ended TTL/NIM LEMO 00 male connector Software programmable function (trigger, veto, busy, etc.) TRG-IN/S-IN: internally terminated with 50 Ω (Zin = 50 Ω) TRG-OUT requires Rt = 50 Ω

ANALOG OUT

Software programmable DAC output (12-bit/125MHz) with four operating modes:
- Test Waveform: 1 Vpp test ramp generator
- Majority signal: proportional to the number of channels (enabled) under/over threshold (1 step = 125 mV)
- Buffer Occupancy: output signal is proportional to the Multi Event Buffer Occupancy (1 buffer ~ 1 mV)
- Voltage level: output signal is a programmable voltage level (0 to +1 V range with 12-bit resolution)

ACQUISITION MEMORY

1.835 MS/ch (1.9 ms @ 1GS/s), that is 3.6 MS/ch in DES mode (1.9 ms @ 2GS/s) or 14.4 MS/ch (15 ms @ 1 GS/s) that is 28.8 MS/ch in DES mode (15 ms @ 2 GS/s) Multi-event Buffer divisible into 1 ÷ 1024 buffers
Independent read and write access
Programmable event size and pre/post-trigger

COMMUNICATION INTERFACE

VMEbus	Optical Link
VME64X Data modes: D32, BLT32, MBLT64, CBLT32/64, 2eVME, 2eSST, Multi Cast Cycles Transfer Rate: 60 MB/s (MBLT64), 100 MB/s (2eVME), 160 MB/s (2eSST) Sequential and random access to the data of the Multi Event Buffer The Chained readout allows to read one event from all the boards in a VME crate with a BLT access	CAEN proprietary CONET protocol Transfer Rate: up to 80 MB/s Daisy Capability: up to 8 ADC modules per single optical link by A5818 Controller or A4818 Adapter

TRIGGER AND EVENT ACQUISITION

Triggered Mode

Trigger Sources

Trigger Timestamp – Waveform Rec. firmware

All the channels fire simultaneously upon a global trigger generated by the Central Logic Unit receiving the trigger source signals; a zero suppression function is available.

Software by register writing
External upon the leading edge of The TRG-IN signal (TTL/NIM)
Local (self-trigger) upon the channel discriminator with programmable threshold

Resolution: 16 ns
Counter range: 31 bits (default); extendable to 48-bit by firmware
Full-scale range: ~ 17 s @31-bit

Streaming Readout Mode

Each channel autonomously identifies the ROI and uses the local trigger to get events independently on the other channels; validation logics can be configured for correlated acquisition (coincidence/anticoincidence).

Trigger Timestamp – DPP firmware

DPP-PSD:

Resolution: 1 ns
Counter Range: 48 bits
Full-scale range: ~ 78 h
Digital CFD: 10-bit, 1 ps fine timestamp

DPP-ZLEplus:

Resolution: 16 ns
Counter Range: 31-bit (default); extendable to 48-bit by firmware
Full-scale range: ~ 17 s @31-bit

SYNCHRONIZATION

Clock Generation

CLK-IN/CLK-OUT Connector

By default, the Digitizer’s main clocks are generated upon a 50MHz reference frequency that can optionally be internal (50MHz local Oscillator) or external (CLK-IN). Onboard programmable PLL allows locking to different external frequencies.

Reference clock differential signal
2.54mm 3-pin AMPMODU Mod II male connector
CLK-IN: AC-coupled LVDS, ECL, PECL, LVPECL, CML (Zdiff = 100 Ω)
CLK-OUT: LVDS

Clock Synchronization

Default 50MHz frequency distributed by:

Fan-in into CLK-IN (DT4700)
CLK-IN/CLK-OUT Daisy chain with sw programmable CLK-OUT delay shift

PLL programming files for supported custom frequencies can be generated and loaded by the CAEN Toolbox software.

Data Synchronization

Programmable Busy/Veto logic on differential LVDS I/O, or single-ended NIM/TTL I/O for event building.

Run Synchronization (Acquisition Start/Stop)

Optionally, by Daisy chain or fan-in propagation through differential LVDS I/O, or single-ended NIM/TTL I/O.

Trigger Distribution

TRG-IN/TRG-OUT NIM/TTL LEMO I/O (global trigger) or LVDS I/O (global or local trigger).

FPGA

Altera Cyclone EP3C16
One FPGA serves 2 channels

CAEN FIRMWARE

DPP Firmware (Shareware)

Waveform Recording Firmware (Freeware)

Upgrades (Free)

Pay firmware implementing a digital pulse processing algorithm:

DPP-PSD: Charge Integration and Pulse Shape Discrimination
DPP-ZLEplus: Zero Length Encoding

30-minute per power cycle in Trial mode; license is required for full-time work.

Designed for waveform recording.

Web available CFA files for Waveform Recording and DPP firmware upgrade through the CAEN Toolbox software, via VMEbus or Optical Link.

SOFTWARE

Readout Software for Waveform Rec. Firmware (Freeware)	Readout Software for DPP Firmware (Freeware)	SDK and Tools (Freeware)
CAEN WaveDump: Digitizer 1.0 series support, single-board management, user-customizable WaveDump2: Digitizer 1.0 and 2.0 series support, single and multi-board management, GUI based	CoMPASS: Digitizer 1.0 and 2.0 series support, single and multi-board management, GUI based DPP-ZLEplus Readout Demo: sample code with C source files to dial with the ZLE functionalities and help in user’s DAQ development	General-purpose libraries (C/Python, LabVIEW) with demo samples for host Windows® and Linux® PC.

ENVIRONMENTAL

Environment: Indoor use
Operating Temperature: 0°C to +40°C
Storage Temperature: -10°C to +60 °C
Operating Humidity: 10% to 90% RH non condensing
Storage Humidity: 5% to 90% RH non condensing
Pollution Degree: 2
Overvoltage Category: II
EMC Environment: Commercial and light industrial
IP Degree: Enclosure (desktop models), not for wet location

REGULATORY COMPLIANCE

EMC: CE 2014/30/EU Electromagnetic Compatibility Directive
Safety: CE 2014/35/EU Low Voltage Directive

POWER CONSUMPTIONS

+5V: 6.5 A (Typ.)

+12V: 0.2 A (Typ.)

-12V: 0.3 A (Typ.)

VX1751

4/8 Input Channel 10 bit 2/1 GS/s Digitizer

Software

CAEN Toolbox

CAENDigitizer Library

COMPASS

WaveDump

CAEN FELib Library

WAVEDUMP2

Firmware

D-WAVE

DPP-PSD

DPP-ZLEPLUS

DPP-SUP

Accessories

A954

A316

A318

DT4700

A317

A319B

AI2700

A654

A659

A952

A953

Ordering Options

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A4818

DT5751

µ-crate

VME8100

V1751

VME8200

A5818

VME8004X

VX3718

VX4718

VME8008X

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