VX1720

8 Input Channel 12bit 250 MS/s Digitizer

Home Modular Pulse Processing ElectronicsAnalogDigitizers VX1720

12 bit 250 MS/s ADC
FPGA for real time Digital Pulse Processing:
- Pulse Shape Discrimination (DPP-PSD)
- Zero Suppression (Waveform Recording Firmware)
8 input channels (single-ended)
2 Vpp input range
16-bit programmable DC offset adjustment: ±1 V independently on each channel
Trigger Time stamps
Multi-Event Memory buffer: 1.25 or 10 MS/ch, divisible into up to 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. VX1720 is a Waveform Digitizer, housing a 8 Input Channel 12 bit 250 MS/s Flash ADC, designed for waveform recording and supporting advanced algorithms for online digital pulse processing (DPP).

The individual DC offset adjustment (range ±1 V) by programmable 16bit DACs allows the effective sampling of either bipolar (Vin = ±1 V), or full positive (Vin = 0 ÷ +2 V), or negative (Vin = 0 ÷ -2 V) analog input swing without losing dynamic resolution.
The module features front panel Clock Input and Output and mounts a PLL for the clock synthesis upon internal/external references. The data stream is continuously written in a circular memory buffer. When the trigger occurs, the FPGA writes further N samples for the post trigger and freezes the buffer that can be read either by VMEbus or Optical Link. The acquisition can continue without dead time in a new buffer.

Each channel has a SRAM Multi-Event Buffer divisible into 1 ÷ 1024 buffers of programmable size. Two sizes of the channel digital memory are available by ordering options: 1.25 MS/ch (mod. VX1720E) and 10 MS/ch (mod. VX1720G). “Zero suppression” and “data reduction” algorithms allow substantial savings in data amount readout and processing, rejecting samples smaller than a programmable threshold. The V1720 supports multi-board synchronization allowing all ADCs to be synchronized to a common clock source and ensuring Trigger Time Stamp and Data alignment.

The trigger for the event acquisition can be provided either externally via the front panel Trigger Input, or by software command, or it is internally generated upon the self-trigger capability (i.e. individual discriminator on each channel with programmable threshold). The trigger from one board can be propagated to the other boards through the front panel Trigger Output.

An Analog Output is available with four operating modes supported:

Waveform Generator: 1 Vpp test ramp
Majority: output signal is proportional to the number of input channels 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)

The VX1720 houses VME (VME64X compliant) and Optical Link interfaces. The VME interface allows data transfers of 60 MB/s (MBLT64), 100 MB/s (2eVME), 160 MB/s (2eSST). The Optical Link supports transfer rate of 80 MB/s and offers Daisy chain capability. Therefore, it is possible to connect up to 8 ADC modules to the single-link A4818 Adapter, while up to 32 ADC modules to the 4-link A5818 .

Software available (Windows and Linux):
CAEN provides drivers for all the different types of physical communication channels, a set of C, Python, and LabView libraries (CAENComm and CAENDigitizer), demo applications and utilities:

CAEN Toolbox: 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.
CAEN WaveDump: C-based readout program for the single-board management or Digitizer 1.0 Series running the Waveform Recording firmware, provided with source files for user customization.
WaveDump2: Open source GUI-based application for the single and multi-board management of Digitizer 2.0 and 1.0 Series running the Waveform Recording / Scope firmware.
CoMPASS: Multiparametric DAQ Software for Physics Applications with single and multi-board support of Digitizer 2.0 and 1.0 Series running the DPP firmware.

CAEN provides also for this model Digital Pulse Processing firmware for Physics Applications. This feature allows to perform on-line processing on detector signal directly digitized:

DPP-PSD Digital Pulse Processing for Pulse Shape Discrimination
x720(*) and x751 digitizers running DPP-PSD firmware accept signals directly from the detector and implement a digital replacement of dual gate QDC, discriminator and gate generator.

^(*) DPP-CI firmware and DPP-CI Control Software are no longer supported. To perform Charge Integration please refer to the DPP-PSD firmware and software

The VX1720 fits in the single-slot CAEN VME64X u-crate, which allows you to convert the VME digitizer into a desktop board for lab tests.

Ordering Options

Code	Description
WVX1720EXAAA	VX1720E – 8 Ch. 12 bit 250 MS/s Digitizer: 1.25MS/ch, C20, SE	RoHS
WVX1720GXAAA	VX1720G – 8 Ch. 12 bit 250 MS/s Digitizer: 10MS/ch, C20, 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
	V1720	VME	8	250	125	2	12	1.25 M / 10 M	MCX	DPP-PSD, D-WAVE	NO
	DT5720	Desktop	4 / 2	250	125	2	12	1.25 M / 10 M	MCX	DPP-PSD, D-WAVE	NO
	VX1720	VME64X	8	250	125	2	12	1.25 M / 10 M	MCX	DPP-PSD, D-WAVE	NO

GENERAL

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

ANALOG INPUT

Number of Inputs: 8, single-ended, DC coupled
Bandwidth (-3dB): 125 MHz
Impedance: 50 Ω
Gain: x1, fixed
Connector Type: MCX
Full Scale Range: 2 Vpp
DC Offset: Adjustable in the ± 1V range independently on each input channel
Abs. Max. Voltage Rating: 6 Vpp (with Vrail max +6 V or –6 V for any DAC offset value)

DIGITAL CONVERSION

Resolution: 12 bits
Sampling Rate:
- 250 MS/s simultaneously on each channel (nominal)
- Down to 31.25 MS/s by hardware downsampling* (AN6308)

*The minimum value may depend on the digitizer model, the firmware, and the hardware downsampling mode.

SYSTEM PERFORMANCE

ENOB: 10.14 (64 kS Buffer)
SINAD: 62.85 dB
THD: 74.1 dB
SFDR: 82.0 dB
SIGMA: 0.95 LSB rms (64 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 with four operating modes:
- Test Waveform: 1 Vpp test ramp generator
- Majority: output signal is proportional to the number of (enabled) input channels 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

1.25 MS/ch (5 ms @ 250 MS/s) or 10 MS/ch (40 ms @ 250 MS/s) Multi Event Buffer divisible into 1 ÷ 1024 buffers
Independent read and write access
Programmable event size and pre/post-trigger

COMMUNICATION INTERFACES

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-PSD firmware

Resolution: 4 ns
Counter Range: 32 bits (default); extendable to 47 bits by firmware, to 64 bits by software
Full-scale range: ~ 17 s @32-bit

SYNCHRONIZATION

Clock Generation

CLK-IN/CLK-OUT Connector

By default, the Digitizer’s main clocks is 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 EP1C20
One FPGA serves 1 channel

CAEN FIRMWARE

Developed by CAEN, stored in the on-board FLASH memory.

DPP Firmware (Shareware)

Waveform Recording Firmware (Freeware)

Upgrades (Free)

Pay firmware implementing a digital pulse processing algorithm:

DPP-PSD: Charge Integration, Pulse Shape Discrimination

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 Recording 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	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

+5 V: 4.0 A (Typ.)
+12 V: 0.2 A (Typ.)
-12V: 0.2 A (Typ.)

VX1720

8 Input Channel 12bit 250 MS/s Digitizer

Software

CAEN Toolbox

CAENDigitizer Library

COMPASS

WaveDump

CAEN FELib Library

WAVEDUMP2

Firmware

D-WAVE

DPP-PSD

Accessories

A4818

A954

A316

A318

DT4700

A317

A5818

A319B

AI2700

A654

A659

A952

A953

Ordering Options

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