16Ch Programmable Spectroscopy Amplifier and Dual 16Ch CFD (30% and 80%)
- 16 channels in a one unit wide NIM module
- Positive or negative inputs accepted on each channel
- ±4 V input dynamics on 50 Ohm
- Completely programmable via RS485 interface
- Programmable (2 bit) shaping time per channel (0.5 ÷ 4 µs)
- 2bit coarse gain and 7 bit fine gain for energy amplifier
- 2bit coarse gain for timing amplifier
- Maximum gain: 280 @ 4 µs shaping time / 220 @ 0.5 µs shaping time
- 8 bit pole zero adjustment
- 16 energy gaussian outputs with programmable polarity
- 16 channel CFD (30% constant fraction)
- 16 channel CFD (80% constant fraction)
- 16 channel 30% CFD multiplexed output
- Energy multiplexed output
- OR and Sum output
- Libraries, Demos (C and LabView) and Software tools for Windows and Linux
The Mod. N1568A is a 16 channel Programmable Spectroscopy Amplifier and Dual 16Ch CFD (30% and 80% constant fraction) implemented in a single-width NIM module.
This module is designed to be used with silicon detectors connected to charge preamplifiers, where the measure of charges collection time allows to obtain the identification in Z of the particles caught by the detector. The rise time is measured via two constant fraction discriminators (30% and 80% of rise time respectively).
Each channel is composed by two sections: Energy section (A) and Timing section (B). The input signal is sent to both sections simultaneously. Section A processes the input signal with a differential circuit, followed by the gain stages (coarse: 2 bit; fine: 8 bit), and finally by the shaping.
Section B processes the signal with a low noise differential stage (500 ns) followed by a 2 bit programmable linear gain stage; the signal is then fed to two low walk and high resolution Constant Fraction Discriminator sections (30% and 80% constant fraction respectively).
The discriminators share a 8 bit common threshold; the discriminators delay is adjustable via PCB jumpers (6 steps from 15 to 150 ns).
The RS485 interface allows to handle most functional parameters such as Shaping Time, Coarse and Fine Gain, Input Polarity, CFD Thresholds, Pole Zero Adjustment etc.
Positive or negative pulses, max. amplitude of ±4V, 50 ohm impedance
Input polarity must be set via terminal
- E OUT
Unipolar/gaussian signal with a dynamic range of 0 ÷ ± 8V max (on 1Mohm), 50 ohm output impedance; polarity must be set via terminal
- OUT CFD 30%
A and B connectors, ECL output; width 750÷1000 ns
- OUT CFD 80%
- 80% CFD OUT
Differential ECL output
- MUX E
on LEMO connector, 0 ÷ ±5V max (on 1M), 50 ohm impedance; high impedance when disabled.
On double row connector, 0 ÷ ±5V max (on 1Mohm), 50 ohm impedance, high impedance when disabled, same polarity as E OUT,
amplitude: 0.625x E OUT(on 1Mohm)
- MUX CFD 30%
– 4mA current output (-200 mV on 50 ohm)
Sum of OUT CFD 30%; – 1mA current output per hit, 50mV on 50 ohm
on LEMO connector, standard NIM output; -16mA current output
on double row connector, -16mA current output
- INTEGRAL NON LINEARITY
±0.05% in 20÷90% of the full scale @ Gain=Max and 4 µs shaping time (± 0.12% typ. for any shaping time).
- EQUIVALENT INPUT NOISE
< 10 µV (Gain=max; 4 µs shaping time)
- INTERCHANNEL CROSSTALK
<-55 dB at max Gain, 4µs shaping time and 4 V input on adjacent channel
- COARSE GAIN RANGE
2bit adjustable (1, 4, 16, 64 circa); set 0 / gain =1; set 1 / gain =4; etc.
Normalized respect to minimum gain = 0.8
- FINE GAIN RANGE
0÷191 counts adjustable, from 1 to 4 circa; set 0 / gain =1.set 191 / gain = 4
Normalized respect to minimum gain = 0.8
- SHAPING TIME
selectable time constant of 0.5 µs, 1 µs, 2 µs and 4 µs by 2 bits (0 leads to 4 µs; 1 to 2 µs etc.)
- Pole- zero Adjustment
50 to 2000 µs
- Shaping Time for Timing section
1000 ns Diff., 10 ns Int.
- Corse Gain Timing
2bit adjustable (1, 2, 4, 8 circa); set 0 / gain =1; set 1 / gain=2; etc.
- CFD THRESOLD
20 ÷ 700mV (settable from 0 ÷ 700mV on 8bit)
set 0 /CFD THR=0 mV.set 255/CFD THR=700 mV
THR value measured directly on the discriminator; THR = 700 mV correspond to 1V input amplitude, with Coarse gain Timing = 0, Input rise time/fall time = 100 ns, delay = 100 ns
- DELAY VALUE of the CFD30%
selectable by SMD zero Ohm resistance on PCB (soldered on J3 socket) between 15 to 150ns (6 steps): 15ns, 22ns, 30ns, 37ns, 100ns (default), 150ns
- DELAY VALUE of the CFD80%
- Rise time linearity (CFD 30% to CFD 80%)
<3% (from 20 ns to 250 ns input rise time)
16Ch Programmable Spectroscopy Amplifier and Dual 16Ch CFD (30% and 80%)Product page
|Name||File extension||File size||Revision||Last update|
|N1568A-16Ch Programmable Spectroscopy Amplifier and Dual 16Ch CFD (30% and 80%)||623.88 kB||0||31/07/2015|
|Precautions for Handling Storage Installation||118.39 kB||-||14/12/2017|
|WN1568AXAAAA||N1568A - 16 Ch. Programmable Spectroscopy Amplifier and Dual 16Ch CFD (30%; 80%)|