Model TD2000 Ultra Fast Timing Discriminator with GHz LE operation
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FEATURES
- -2.0 to +3.0V input range
- ±1.25V input threshold range
- GHz operation capability
- 750ps min. output pulse width
- Four outputs
- Fast VETO input
- Shaped output pulse widths <1ns to >350ns
- Unshaped output bandwidth 2.4GHz (3dB)
APPLICATIONS
- Ultra high count rate Single Photon Counting
- LIDAR
- TOF Mass-Spectrometry
- Ultra high count rate Multiscaling
DESCRIPTION
Probably the fastest leading edge discriminator available today. The unshaped outputs can be used at rates in the GHz range (ref. Fig 3). A fast NIM VETO input provides for inhibiting the shaped outputs. The fast NIM outputs exhibit fall times of <200ps. The shaped fast NIM output has a minimum pulse width of typ. 750ps only. Even the positive output has a fast rise time of approx. 500ps. Thus, pulse widths as low as 2ns can be achieved at full amplitude.
SPECIFICATIONS
General:
Input to unshaped output delay: approx. 1.7ns
Input to shaped output delay: approx. 3.3ns
Inputs:
Signal: BNC, 50Ω, direct coupled, -2.0 to +3.0V,
sensitivity <10mV, slew rate requirement
>5V/μs
Threshold: ±1.25V, 10-turn precision potentiometer, 2mm
monitor test point for voltmeters
Veto: BNC, 50Ω, direct coupled, -300mV threshold,
fast NIM compatible, slew rate requirement
>5V/μs
Outputs:
Unshaped: 2x BNC, 50Ω back-terminated, fast NIM
current mode, -16mA into external 50Ω,
inverting & non-inverting, 2.4GHz (3dB)
bandwidth
Shaped: 2x BNC, pulse width 10-turn screwdriver adjustable, <1ns to >350ns, input edge sensitivity rising/falling switch selectable
a) 1x negative fast NIM current mode, 50Ω back-terminated, -16mA into external 50Ω, 400MHz continuous rate
b) 1x positive voltage follower mode, VOL < 0.5V, VOH>+2.0V into external 50Ω (for widths > 2ns)
Physical:
Case: extruded aluminium sheath
Al Mg Si 0.5
Lid: die cast, GD-Al Si 12
Size: 121/153 x 142 x 37 mm
Weight: 500 g
Power Requirements:
Connector: 2.1 mm center pin
Supply Voltage: nominal +12V
voltage range +10 … +18V
Supply Power: 6W
Reverse polarity protection
Absolute maximum ratings:
Supply: 25V (100ms max.)
Signal input: -3V ... +4.0V
ESD rating 1,500V HBM
Accessories:
External wall power supply (included)
Precision screwdriver (included)
