A422
Discontinued
Charge Sensitive Preamplifier with Timing (Hybrid)
Features
- Fast, low noise inverting preamplifier
- Positive or negative input signals
- Energy sensitivity range selectable between 1, 45 or 90 mV/MeV (Si)
- Timing output
- Up to 1 kV (positive or negative) detector bias voltage
Overview
The CAEN Mod. A422 is a charge sensitive preamplifier implemented on an open frame SIP hybrid assembly. The module is designed to be used especially with semiconductor detectors and in particular whenever the charge division is required (as in position sensitive silicon detectors). The unit accepts both positive and negative input pulses. A Test input for detector gain calibration and a HV input (up to 1 kV) for the detector bias are also included. The output is an inverting unipolar voltage pulse, proportional in amplitude to the integrated charge; decay time is 220 µs. A Timing output provides an unipolar inverting fast voltage pulse, with a 15 ns typical rise time, across a 50 Ω load. Three different sensitivities (1, 45 or 90 mV/MeV) can be selected via internal connections. A 8-slot motherboard for the A422 is also available; it can be purchased equipped with LEMO 00 I/O connectors (Mod. A658) or with soldering pads (Mod. A658A).
Technical Specifications
- Packaging
Single in-line package hybrid
(38 mm x 33 mm x 7 mm);
pin pitch: 2.54 mm; weight: 9.8 g
- Input Signals (IN/DETECTOR)
Accepts positive and negative charge pulses from semiconductor detectors and supplies the HV bias to the detector itself
- Input Signals (HV)
up to 1KV (positive or negative) for detector bias. 101 MΩ resistance in series
- Input Signals (TEST)
Positive or negative inputs to calibrate the gain of the detector input via Ctest = 10 pF
- Output Signals (OUT/ENERGY)
- Inverting unipolar output
- Rise time < 20 ns typically
- Decay time constant : 220 µs
- Maximum peak amplitude: ± 8 V
- Output Signals (TIMING)
Inverting unipolar fast voltage pulse. 5 ns minimum rise time. Requires a 50 Ω termination whether it is used or not.
- Integral non linearity
± 0.05 % (from 0 to ± 8 V peak output)
- Gain drift
± 50 ppm/°C (from 0° to 50°C)
- Energy sensitivity
1/45/90 mV/MeV (Si) selectable via internal jumpers
- Typical noise
9.8 KeV FWHM at 470 pF capacitance and 90 mV/MeV sensitivity
- Power requirements
- +24 V/30 mA
- -24 V/20 mA
Compare
Compare with Charge Sensitive Preamplifiers.
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Ordering Options
| Code | Description |
|---|---|
| WA422XAAAAAA | A422 - Charge Sensitive Preamplifier with timing(Hybrid) (Discontinued) RoHS |
Related Products
A422A
Charge Sensitive Preamplifier with Timing (Box)