VX1742

32+2 Channel 12bit 5 GS/s Switched Capacitor Digitizer

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12 bit 5 GS/s ADC
Switched Capacitor technology based on the DRS4 chip (designed at Paul Scherrer Institute)
- 1024 capacitor cells per channel (acquisition window of ~ 200 ns @ 5 GS/s)
5 GS/s , 2.5 GS/s, 1 GS/s, 750 MS/s software selectable sampling frequencies
32 input channels, single-ended
2 additional input channels (TR0 and TR1):
- fast (low-latency) trigger
- digitizable for subnanosecond resolution timing
Max. AD conversion dead-time: 181 µs digitizing TR0 and TR1
1 Vpp input range (default); 2 Vpp customization by ordering option
16-bit programmable DC offset adjustment in the full range independently on each channel
Trigger Time stamps
Memory buffer options: 128 events/ch or 1024 events/ch
Pre-post trigger adjustment
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 WaveDump software

The CAEN Mod. VX1742 is a Waveform Digitizer, in VME64X form factor, housing 32+2 Channel 12 bit 5 GS/s ADC stage based on Switched Capacitor Digitizer arrays. This technology makes it suited for very fast signals from scintillators coupled to PMTs, Silicon Photomultpliers, APD and Diamond detectors, at the cost of a dead-time due to the analog-to-digital conversion.

The Switched Capacitor Array is DRS4 chip (Domino Ring Sampler by Paul Scherrer Institute), implementing a series of 1024 capacitors (analog memory) in which the analog input signal is continuously sampled in a circular way. The default sampling frequency is 5 GHz, while 2.5 GHz, 1 GHz, and 750 MHz can be software selected.

To dial with such high rates, the TR0 and TR1 are available as fast local and low-latency trigger inputs. Moreover, they can be digitized as additional analog inputs to achieve sub-nanosecond risolution in timing measurement.

The input signal is continuously sampled at high frequency in the DRS4 array of capacitive cells (holding phase) until the trigger arrival. The trigger stops the sampling, the analog memory buffer is frozen, and the cell content is sent to the 12-bit ADC to be digitized at lower frequency. The non-simultaneity between the Sample & Hold phase and the digital conversion generates a dead-time (110 μs in case the TRn input is not digitized, 181 μs vice versa).

In TRn mode, the acquisition takes place on the 16-channel group driven by TR0 independently on the 16-channel group driven by TR1; global trigger options can be managed by external TRG-IN (high-latency) or software trigger . A self-trigger mode can be set only at low sampling frequencies (up to 1 GHz) due to the trigger latency.

The events are stored into the channel digital memory (128 events/ch or 1024 events/ch available sizes) to be read out through the VMEBus or Optical Link interfaces. Multiple boards can be synchronized to build up complex systems.

This Digitizer is fully supported by WaveDump software, while libraries and demo software in C, Phyton, and LabView are available for integration and customization of specific acquisition systems.

Note: VX1742 can be operated with VME8004X / VME8008X /VME8100 / VME8200/μ-crate.

Ordering Options

Code	Description
WVX1742BXAAA	VX1742B – 32+2 Ch. 12 bit 5GS/s Switched-Capacitor Digitizer: 1024 events/ch (1kS/event), EP3C16, SE	RoHS
WVX1742XAAAA	VX1742 – 32+2 Ch. 12 bit 5GS/s Switched-Capacitor Digitizer: 128 events/ch (1kS/event), 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
	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
	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
	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
	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

GENERAL

Weight: 520 g
Form Factor: 1-unit wide VME64X
Dimension: 6U x 160 mm

ANALOG INPUT

Number of Inputs: 32 + 2 additional TR0-TR1, single-ended, DC coupled
Bandwidth (-3dB): 500 MHz
Impedance: 50 Ω
Connector Type: MCX
Full Scale Range: 1 Vpp default; 2 Vpp customization by ordering option
16-bit programmable DC offset adjustment in the full range independently on each channel
Abs. Max. Voltage Rating: 3Vpp (with Vrail max +3V or ‐3V) for any DAC offset in single ended configuration

DIGITAL CONVERSION

Resolution: 12 bits
Sampling Rate:
- 5 GS/s default
- 2.5 GS/s, 1 GS/s, 0.75 GS/s software selectable

Switched Capacitor Array: Domino Ring Sampler chip (DRS4), 8+1 channels with 1024 storage cells each
Dead-time: 181 μs digitizing TR0 and TR1, 110 μs without.

DIGITAL I/O

LVDS I/O	TRG-IN/TRG-OUT/S-IN
16 differential pairs Sw programmable I/O function (Busy/Veto, Sync, Data Ready, Memory full, Trigger Out, Start/Stop, 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, sync, busy, start, etc.) TRG-IN/S-IN: internally terminated with 50 Ω (Zin = 50 Ω) TRG-OUT requires Rt = 50 Ω

ANALOG OUT

Not used.

ACQUISITION MEMORY

128 events/ch or 1024 events/ch Multi‐event buffer (1024 S/event, that is 200 ns/event @ 5 GS/s)
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 when receiving a software command or external TRG-IN signals.

TRn Mode

When the TRn signal crosses a programmable threshold, the driven 16-channel group fires simultaneously and independently on the other 16-channel group.

Software by register writing
External upon the leading edge of The TRG-IN signal (latency 115 ns, jitter 17 ns)
Fast Local upon over-/under-threshold on TRn signal (latency 42 ns, jitter 8.5 ns)
Local (self-trigger) upon the channel LED with programmable threshold (latency 320 ns, jitter 17 ns)

Resolution: 8.5 ns
Counter range: 30 bits (default); extendable to 60-bit by software
Full-scale range: ~ 9 s @30-bit

Local Trigger Mode

Each 16-channel group fires simultaneously and independently on the other basing on the OR of its channel self-triggers.

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

Fan-in to TR0 and TR1 fast local triggers.

FPGA

Altera Cyclone EP3C16
One FPGA serves 16+1 channels

CAEN FIRMWARE

Waveform Recording Firmware (Freeware)	Upgrades (Free)
Designed for waveform recording.	Web available CFA files for Waveform Recording firmware upgrade through the CAEN Toolbox software, via VMEbus or Optical Link.

SOFTWARE

Readout Software for Waveform Rec. Firmware (Freeware)	SDK and Tools (Freeware)
CAEN WaveDump: Digitizer 1.0 series support, single-board management, user-customizable	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 REQUIREMENTS

+5V: 5.5 A (Typ.)
+12V: 0.085 A (Typ.)

VX1742

32+2 Channel 12bit 5 GS/s Switched Capacitor Digitizer

Software

CAEN Toolbox

CAENDigitizer Library

WaveDump

Firmware

D-WAVE

Accessories

A954

Digitizers Input Range Personalizations

A316

A318

DT4700

A317

A319B

AI2700

A654

A659

A952

A953

Ordering Options

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