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N1068

16 ch Programmable Spectroscopy Amplifier and 16ch CFD

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Features

  • 16 channels is a one unit wide NIM module
  • Differential and Single ended versions available
  • Dedicated version for germanium detector
  • Pile-up rejection facility individually selectable
  • Programmable positive or negative input polarity per each channel
  • ±4 V input dynamics on 50 Ω (SE) and 110 Ω (Differential)
  • Active baseline restorer with programmable output offset
  • 16 channels CFD with 5 step delay individually jumper selectable
  • 12-bit programmable delay on ECL CFD output (range: 200 – 800 ns)
  • Timing filter amplifiers with programmable differentiation and integration time
  • CFD, Energy or Timing filter multiplexed output
  • Multiplicity trigger (NIM) with programmable threshold
  • Programmable 4 (5 for N1068GE) shaping time per channel
  • Programmable fast unipolar input mode for PMT and all fast charge detectors
  • 8 step coarse gain and 7-bit fine gain for energy amplifier
  • Low Noise
  • Programmable 8-bit pole zero adjustment
  • Completely programmable via USB, Ethernet and RS485: Thresholds. shaping times, gains, Pole-Zero, etc.
  • OR output and Multiplicity output
  • Low Power
More info
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Overview

The CAEN Mod.N1068 is a 16 channel Programmable Spectroscopy Amplifier with Time Filter, Constant Fraction Discriminator (CFD) and pile-up rejection, implemented in a single width NIM module. This module is designed to be used with Germanium, and many other detectors types connected to charge sensitive preamplifiers. Also adapted for fast input signal like PMT and all fast charge detectors. Available dedicated version for germanium detector (N1068GE). N1068 has the following input configurations:

  • Single Ended (50 Ω Impedance): N1068S and N1068GE
  • Differential (110 Ω impedance): N1068DB

The first stage of the Amplifier circuits is the polarity selector circuit which select the positive or negative input polarity. Follow two different sections which provide the Energy and Timing information. The Energy section is composed by a Spectroscopy amplifier with CR-RC5 shaping type and different time constants: pole-zero compensation, an 8-step coarse gain (2, 4, 8, 16, 32, 64, 128, 256), a 7-bit fine gain (from 1 to 2) and a DC restorer circuit. The time constants have the following values:

  • N1068DB, N1068S: 0.5, 1, 2, 4 μs
  • N1068GE: 0.5, 1, 2, 4, 16 μs

The Timing section is composed by a Timing filter with a differential stage followed by an integration stage both with two-time constants. An amplifier stage provides 4 gain values. This timing signal is sent to a Constant Fraction Discriminator section (Constant Fraction = 30%). The CFD has an auto walk compensation and the delay time is selectable individually for each channel by 5 step jumpers. The width and delay of CFD OUT is individually programmable; the delay can be enabled or disabled. The trigger stage foresees a Programmable Multiplicity Trigger and Multiplicity signal, an analog sum output of every channel CFD out; Multiplicity signal can be daisy chained with those provided by other modules. Chaining with a Sum Output available as well. Pile-up rejection is configurable individually for each channel. When enabled each time a pile-up event occurs, the Energy output is set to the saturation value. The USB 2.0, Ethernet and RS485 interfaces allow to handle all functional parameters.

The N1068 is supported by freely downloadable CAEN-CSA software, available for both Windows and Linux OS.

Technical Specifications

Packaging

One unit wide NIM unit

Power requirements

6V 2.9 A; -6V 1.8 A; +12V 250 mA; -12V 250 mA

Input
  • Positive or negative pulses, max. amplitude of ±4V
  • 50 Ω impedance (SE), 110 Ω (Differential)
  • Input polarity must be set via terminal
OUT
  • Unipolar/Gaussian signal with a dynamic range of 0 ÷ ±8 V max (on 1 MΩ)
  • 50 Ω output impedance
  • Common offset adjust (-200 ÷ +200 mV) 8-bit resolution
XOUT
  • Unipolar/Gaussian signal, further 10x fixed amplification of the OUT value, with a dynamic range of 0 ÷ ±8 V max (on 1 MΩ)
  • 50 Ω output impedance
  • Common offset adjust (-200 ÷ +200 mV) 8-bit resolution
CFD OUT

Diff. ECL output, width 65÷1430 ns ±5%, 5 bit adjustable

MUX

Output, on LEMO connector and on double row connector:

  • Options: energy, timing, disabled; 0 ÷ ±8V max (on 1 MΩ)
  • 50 Ω output impedance
  • High Impedance when disabled
MUX CFD

CFD out of channel with MUX enabled. Standard NIM output on double row connector

MUL

Multiplicity output: analog sum of CFD OUT, -2 mA current output per hit; -100 mV on 50 Ω

MUL DISC
  • Standard NIM output on double row connector
  • Multiplicity Trigger Discriminator (Time over threshold) with Programmable Threshold
Integral non linearity

<± 0.02% in 10%÷90% of the full scale @ Gain=45 and 0.5 μs shaping time (<± 0.3% typ. for any shaping time)

OR

Logical OR of the CFD Output, on LEMO connector, standard NIM output, width 140÷1500 ns ±5%, 5 bit adjustable. Individually Enable

Temperature stability [0÷50°C]

Gain: < 70 ppm/°C. DC level Output: < 10 μV/°C

Equivalent Input Noise

< 15 μV RMS (Gain=100, 4 μs shaping time)

Interchannel Crosstalk

<-55 dB at max Gain, 4 μs shaping time and 4 V input on adjacent channel

Coarse Gain Range

Adjustable (2, 4, 8, 16, 32, 64, 128, 256)

Shaping Time

(0.5, 1, 2, 4) μs; 0.5 μs with fast unipolar input select (0.5F)
GE version: (1, 4, 8, 16) μs; 1 μs with fast unipolar input select (1F)

Fine Gain Range

From 1 to 2 , 7-bit adjustable

Pole-zero Adjustment

Done via software on 256 steps to match preamp tails in the 20 to 2000 μs range

Timing Filter Time Constant

Diff. (100, 500 ns), Int. (20, 80 ns)

Timing Gain

Adjustable 1, 4

CFD Threshold

0 ÷ 2048 mV (12-bit resolution)

CFD Delay Time

Selectable by jumper (5 steps): 8 ns, 16 ns, 24 ns, 32 ns, 40 ns

CFD WALK

<±500 ps on 60 mV ÷ 2V input with 10 ns rise time, 50 μs duration

Delay on CFD ECL Output

18÷1380 ns ±5%, 5 bit adjustable. Individually Enable

Pile-up rejection

Individually selectable; when a pile-up event occurs an output saturation is forced

Interfaces
  • USB: USB B type female connector; USB 2.0 compliant
  • ETH: 10/100 Base-T female connector; TTL signals (TCP/IP)
  • RS485 on 10+10 pin header General I/O

Compare

Compare with Amplifiers (Spectroscopy).

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Accessories

A952
Cable assembly 2.54mm 34 pin female to 2.54mm 34 pin female - 50 cm
A385
Adapter 2.54mm 34-pin female to 16x LEMO 00 female (or MCX male) – 50 cm / 1 m

Ordering Options

Code Description
WN1068SXAAAA N1068S - 16 Ch Programmable Spectroscopy Amplifier & CFD SE   RoHS
WN1068GEXAAA N1068GE - 16 Ch Programmable Spectroscopy Amplifier & CFD for Germanium Detector   RoHS
WN1068DBXAAA N1068DB - 16 Ch Programmable Spectroscopy Amplifier & CFD Differential   RoHS

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