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N6740D

Obsolete

32 Channel 12bit 62.5 MS/s Digitizer

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Features

  • 12 bit 62.5 MS/s ADC
  • 32 channels (16 channels on LEMO connectors using A746D adapter)
  • ERNI SMC Dual Row 68 pin connector (32 channels)
  • 2 Vpp single ended input range
  • 16-bit programmable DC offset adjustment: ±1 V
  • Trigger Time stamps
  • Memory buffer: 192 kS/ch, up to 1024 events
  • FPGA for real-time data processing:
  • Programmable event size and pre-post trigger adjustment
  • Optical Link interface (CAEN proprietary protocol)
  • USB2.0 interface
  • Firmware upgradeable via USB/Optical Link
  • Libraries, Demos (C and LabView) and Software tools for Windows and Linux
More info
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Overview

The N6740D is a 32ch 12 bit 62.5 MS/s (65 MS/s using external clock) NIM Waveform Digitizer with 2 Vpp single ended input dynamics on a ERNI SMC connector. 32 channels can be available on LEMO connectors using the A746D adapter.
The DC offset adjustment (range ±1 V) by a programmable 16bit DACs (one for each 8-channel group) allows a right sampling of a bipolar (Vin = ±1 V) up to a full positive (Vin = 0 ÷ +2 V) or negative (Vin= 0 ÷ -2 V) analog input swing without losing dynamic resolution.

The module features a front panel Clock Input and a PLL for clock synthesis from 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 by USB or Optical Link. The acquisition can continue without dead time in a new buffer.

Each channel has a SRAM Multi-Event Buffer of 192 kS divisible into 1 ÷ 1024 buffers of programmable size. The readout (by USB or Optical Link) of a frozen buffer is independent from the write operations in the active circular buffer (ADC data storage).
N6740D supports multi-board synchronization allowing all ADCs to be synchronized to a common clock source and ensuring Trigger time stamps alignment. Once synchronized, all data will be aligned and coherent across multiple N6740 boards.

The trigger signal can be provided externally via the front panel Trigger Input as well as via the software, but it can also be generated internally thanks to threshold self-trigger capability.

N6740D 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 ADC modules to a single Optical Link Controller (Mod. A2818).

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 and CAENDigitizer), 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.

Standard Firmware compliant:

  • CAEN WaveDump: software console application that can be used to configure and readout event data from any model of the CAEN digitizer family and save the data into a memory buffer allocated for this purpose.

Digital Pulse Processing firmware for Physics Applications – this special firmware allows to perform on-line processing on detector signal directly digitizer:

Technical Specifications

Package

Form Factor: 1-unit wide NIM module
Weight: 870 g

Analog Input
  • 32 channels (ERNI SMC Dual Row 68pin connector) or 16 channels (LEMO connectors) by A746D adapter
  • Single-ended
  • input range: 2 Vpp
  • Bandwidth: 30 MHz
  • Programmable DAC for Offset Adjustment (one for each 8-channel group): ±1 V
  • Absolute max. input voltage: 6 Vpp with Vrail max. to +6V or -6V for any DAC offset value
Digital Conversion
  • Resolution: 12 bit
  • Sampling rate: up to 62.5 MS/s simultaneously on each channel (65 MS/s using external clock)
System Performance
ENOB:
SINAD:
THD:
11.20 (48 kS Buffer)
69.20 dB
87.10 dB
SFDR:
SIGMA:
94.9 dB
0.50 LSB rms (48 kS Buffer, open input)
ADC Sampling Clock generation

Supports three operating modes:

  • PLL mode: internal reference (62.5 MHz local oscillator)
  • PLL mode: external reference on CLK_IN
  • PLL Bypass mode: external clock on CLK_IN drives directly ADC clocks (Freq.: 10 ÷ 65 MHz)
Digital I/O
  • CLK_IN (AMP Modu II):
    – AC coupled differential input clock LVDS, ECL, PECL, LVPECL, CML(single ended NIM/TTL available by custom cable)
    – Jitter <100 ppm
  • TRG_IN (LEMO 50 Ohm, NIM/TTL): external trigger input
  • GPI/GPO (LEMO 50 Ohm, NIM/TTL): programmable front panel input/output
Memory Buffer
  • 192 kS/ch Multi Event Buffer
  • Programmable event size and pre-post trigger
  • Divisible into 1 ÷ 1024 buffers
  • Readout of Frozen buffer independent from write operations in the active buffer (ADC data storage)
Common Trigger
  • External (signal on TRG_IN)
  • Software (by USB or Optical Link)
  • Self trigger (internal threshold self-trigger generated by each 8-channel group)
Trigger Time Stamp

31-bit counter, 16 ns resolution, 17 s range(*)
(*)Trigger Logic and Trigger Time Stamp counter operate at 125 MHz (i.e. 8 ns or 1/2 ADC clock cycles), while the counter value is read at a frequency of 62.5 MHz (i.e. 16 ns).

ADC and Memory controller FPGA

One Altera Cyclone EP3C40 per 16 channel

Multi Modules Synchronization
  • Clock distribution: by Fan Out
  • Trigger distribution: by Daisy chain or Fan Out
  • Time stamp synchronization
Optical Link

CAEN CONET proprietary protocol Up to 80 MB/s transfer rate
Daisy‐chain: it is possible to connect up to 8 or 32 ADC modules to a single Optical Link Controller (respectively A2818/A4818 or A3818/A5818)

USB interface
  • USB2.0 compliant
  • Up to 30 MB/s transfer rate
Upgrade

Firmware can be upgraded via Optical Link or USB interface

Software
  • CoMPASS Multiparametric Acquisition Software
  • Caen DPP-QDC demo software (windows only) with C source file for developers

Compare

Compare with Digitizers.

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Accessories

A654
Cable assembly LEMO 00 male to MCX male – 1 m
A746D
Patch panel 32x LEMO 00 female to 1.27mm 68-pin ERNI SMC female
A659
Cable assembly BNC male to MCX male – 1 m
AI2700
Optical Fiber Series
A371
Adapter 2.54mm 34x2 pin male to 1.27mm 68-pin ERNI SMC female
A317
Cable assembly for Clock distribution 3-pin AMPMODU IV female terminations – 18 cm / 25cm
A4818
USB 3.0 to CONET2 Adapter

Ordering Options

Code Description
WN6740DXAAAA N6740D - 32 Ch. 12 bit 62.5 MS/s Digitizer: 192kS/ch, EP3C40, SE  (Obsolete) RoHS

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