A1422

Low-Noise Fast-Rise-Time Charge-Sensitive Preamplifiers (Boxed)

Datasheet

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Fast, low noise inverting preamplifier
Six available sensitivities (Si equivalent):
- 1 mV/MeV
- 5 mV/MeV
- 45 mV/MeV
- 90 mV/MeV
- 400 mV/MeV
- 450 mV/MeV
Up to 1000 pF detector capacitance supported
1, 4 and 8 channel model available
Up to 2 kV (positive or negative) detector bias voltage

The CAEN Mod. A1422 series is a family of charge-sensitive preamplifiers packaged in 1-, 4-, and 8-channel alloy boxes. Various sensitivity values are available, and a wide range of detector capacitances is supported:

F2 type: up to 200 pF; sensitivities: 5, 45, 90, 400, 450 mV/MeV (Si)
F3 type: up to 1000 pF; sensitivities: 1, 5, 45, 90 mV/MeV (Si)

The same preamplifiers are also available as 15-pin single-in-line-package modules (see Mod. A1422H).

Two versions of the A1422 have been produced, based on the corresponding versions of the A1422H module inside (the full specifications of both are reported in the Tech. Spec. section):

Hybrid version — obsolete (no longer in production)
PCB version — current production

All models can be used in nuclear and sub-nuclear physics experiments where very low noise, fast response, and high counting rates are required. The modules accept both positive and negative input charge pulses and provide an energy output with a ±4.5 V range into a 50 Ω termination (±10 V into 1 kΩ). A test input is also provided, accepting positive and negative signals for calibration.

The A1422 modules are housed in alloy boxes and feature SHV connectors for the DET/IN and HV/IN signals, LEMO connectors for the TEST IN and EOUT signals, and a cable terminated with a 9-pin D-sub male connector for the power supply.

A customization is available to improve amplifier protection from transients at the detector input connection.

A1422 models can be powered using the following devices:

Amplifier N968 (via a D-type female connector on the rear panel)
DT5423 – Quad Linear Desktop Power Distributor for Preamplifiers and Digitizer
N5424 – Quad NIM Power Distributor for Preamplifiers
V5425 – Quad VME Power Distributor for Preamplifiers

Here you can find the link at the “MIRACLES detector prototypes and front-end electronics: integration, tests and some lessons learned” presented in DENIM (Design and Engineering of Neutron Instruments Meeting) on September 2023 at Forschungszentrum Jülich in Germany.

The documentation about the older A1422 Hybrid version is still available for download.

Ordering Options

Code	Description
WA1422A001F3	A1422A001F3 – 1 Ch. Charge Preamplifier, 1mV/MeVgain, Cdet<1000pF	RoHS
WA1422A005F2	A1422A005F2 – 1 Ch. Charge Preamplifier, 5mV/MeVgain, Cdet<200pF	RoHS
WA1422A005F3	A1422A005F3 – 1 Ch. Charge Preamplifier, 5mV/MeVgain, Cdet<1000pF	RoHS
WA1422A045F2	A1422A045F2 – 1 Ch. Charge Preamplifier, 45mV/MeVgain, Cdet<200pF	RoHS
WA1422A045F3	A1422A045F3 – 1 Ch. Charge Preamplifier, 45mV/MeVgain, Cdet<1000pF	RoHS
WA1422A090F2	A1422A090F2 – 1 Ch. Charge Preamplifier, 90mV/MeVgain, Cdet<200pF	RoHS
WA1422A090F3	A1422A090F3 – 1 Ch. Charge Preamplifier, 90mV/MeVgain, Cdet<1000pF	RoHS
WA1422A400F2	A1422A400F2 – 1 Ch. Charge Preamplifier, 400mV/MeVgain, cdet<200pF	RoHS
WA1422A450F2	A1422A450F2 – 1 Ch. Charge Preamplifier, 450mV/MeVgain, cdet<200pF	RoHS
WA1422B001F3	A1422B001F3 – 4 Ch. Charge Preamplifier, 1mV/MeVgain, Cdet<1000pF	RoHS
WA1422B005F2	A1422B005F2 – 4 Ch. Charge Preamplifier, 5mV/MeVgain, Cdet<200pF	RoHS
WA1422B005F3	A1422B005F3 – 4 Ch. Charge Preamplifier, 5mV/MeVgain, Cdet<1000pF	RoHS
WA1422B045F2	A1422B045F2 – 4 Ch. Charge Preamplifier, 45mV/MeVgain, Cdet<200pF	RoHS
WA1422B045F3	A1422B045F3 – 4 Ch. Charge Preamplifier, 45mV/MeVgain, Cdet<1000pF	RoHS
WA1422B090F2	A1422B090F2 – 4 Ch. Charge Preamplifier, 90mV/MeVgain, Cdet<200pF	RoHS
WA1422B090F3	A1422B090F3 – 4 Ch. Charge Preamplifier, 90mV/MeVgain, Cdet<1000pF	RoHS
WA1422B400F2	A1422B400F2 – 4 Ch. Charge Preamplifier, 400mV/MeVgain, Cdet<200pF	RoHS
WA1422B450F2	A1422B450F2 – 4 Ch. Charge Preamplifier, 450mV/MeVgain, cdet<200pF	RoHS
WA1422C001F3	A1422C001F3 – 8 Ch. Charge Preamplifier, 1mV/MeVgain, Cdet<1000pF	RoHS
WA1422C005F2	A1422C005F2 – 8 Ch. Charge Preamplifier, 5mV/MeVgain, Cdet<200pF	RoHS
WA1422C005F3	A1422C005F3 – 8 Ch. Charge Preamplifier, 5mV/MeVgain, Cdet<1000pF	RoHS
WA1422C045F2	A1422C045F2 – 8 Ch. Charge Preamplifier, 45mV/MeVgain, Cdet<200pF	RoHS
WA1422C045F3	A1422C045F3 – 8 Ch. Charge Preamplifier, 45mV/MeVgain, Cdet<1000pF	RoHS
WA1422C090F2	A1422C090F2 – 8 Ch. Charge Preamplifier, 90mV/MeVgain, Cdet<200pF	RoHS
WA1422C090F3	A1422C090F3 – 8 Ch. Charge Preamplifier, 90mV/MeVgain, Cdet<1000pF	RoHS
WA1422C400F2	A1422C400F2 – 8 Ch. Charge Preamplifier, 400mV/MeVgain, Cdet<200pF	RoHS
WA1422C450F2	A1422C450F2 – 8 Ch. Charge Preamplifier, 450mV/MeVgain, cdet<200pF	RoHS
WPERS0142201	A1422A 1 Ch Preamplifier Personalization for Improved Input ESD Protection	RoHS
WPERS0142204	A1422B 4 Ch Preamplifier Personalization for Improved Input ESD Protection	RoHS
WPERS0142208	A1422C 8 Ch Preamplifier Personalization for Improved Input ESD Protection	RoHS

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Image	Name	Package	Out Conn.	In Conn.	Test Capac. (pF)	Max Detector Bias Voltage (V)	Integral Non-linearity	Output Linear Range (V)	Output Rise Time (ns)	Noise FWHM keV (Si)	Sensitivity (mV/MeV) (Si)	No. Of Channels
	A1422H	15 Pin SIP hybrid	-	-	1 / 10 / 47	±800	< ± 0.05% (0 ÷ ±10 V 1 kΩ term.)	±10 (1 kΩ term.) ±4.5 (50 Ω term.)	< 5/10/70 @0pF <20/25/45 @390pF	< 2.2/4.7 @0pF <5.8/10.5 @390pF	1/5/45/90/<br>400/450	1
	A1422C/D	Shielded box	RJ-45	SHV	1 / 10	± 2000	<± 0.05%<br>(0 ÷ ±10V 1 kΩ term.)	±5 (1 kΩ term.)<br>±2.5 (100Ω term.)	< 5 @0pF<br><15 @200pF	< 4.7 @0pF<br>< 7.6 @200pF	5	8
	A1422	Shielded box	LEMO or BNC	SHV	1/10/47	±2000	< ± 0.05% <br>(0 ÷ ±10V 1kΩ term.)	±10 (1kΩ term.)<br>±4.5 (50Ω term.)	<5/10/70 @0pF<br><10/20/25/45 @390pF	<2.2/4.7 @0pF<br><5.5/5.8/10.5/36 @390pF	1/5/45/90/<br>400/450	1/4/8
	A1429	Shielded box	Header (17+17)	Samtec 80-pin 0.8mm	0.5 / 1 / 2.2	±400 V Max	N.A.	Differential ± 4.5 VDiff max on 100Ω Term	<20ns @0 pF<br><60ns @200 pF	<5 KeV @0 pF<br><35 eV/pF	20/45/90/<br>200/400	64
	A1422E/F	Shielded box	SMA	SMA	1	±750	<±0.05%<br>(0 ÷ ±10V 1kΩ term.)	±10 (1 kΩ term.)<br>±4.5 (50 Ω term.)	<5.4 @0pF<br><60 @330pF	<2.8 @0pF<br><6.8 @330pF	200	2/4
	A1442	Shielded box	Header (17+17)	D-SUB 25	N.A.	±400	N.A.	Differential ±4.5 Vdiff	< 10 @0pF<br /><20 @200pF	<5 @0pF<br><9.5 @200pF	20 / 100 <br>Selectable	16/32
	Discontinued A422	14 pin SIP hybrid	-	-	10	±1000	<0.05%	± 8 ± 4	<20	<9.8 @470pF	1/45/90	1
	A422A	Shielded box	BNC	SHV	10	±5000	< 0.045%	± 8 ± 4	< 50	<17.5 @1nF	5/30/60	1

No. Of Channels

1 / 4 / 8

Packaging

Alloy Box; Dimensions (WxHxD connector included):

A1422Axxxx (1 ch): 40.0 x 30.0 x 124 mm³
A1422Bxxxx (4 ch): 100.0 x 50.0 x 162 mm³
A1422Cxxxx (8 ch): 100.0 x 50.0 x 162 mm³

Detector In

Accepts positive and negative input charge pulses from semiconductor detectors and supplies the HV bias to the detector itself;
SHV connector

HV Input

Up to 2 kV (positive or negative); 100 MΩ resistance in series;
SHV connector (BNC on request)

Test Input

Positive or negative input for energy calibration through a Ctest capacitor (LEMO-00 connector):

1 pF (standard)
10 pF on 5 mV/MeV versions
47 pF on 1 mV/MeV versions

Output

± 10V max. (open circuit), 50 Ω back termination.

Rise Time (test input rise time: 1.6 ns; amplitude: 200 mV; 50Ω Termination)

Model	0 pF	200 pF	Model	390 pF	1000 pF
F2 – 5 mV/MeV F2 – 45 mV/MeV F2 – 90 mV/MeV F2 – 400 mV/MeV F2 – 450 mV/MeV	< 5 ns < 5 ns < 10 ns < 70 ns < 70 ns	< 15 ns < 15 ns < 25 ns < 110 ns < 110 ns	F3 – 1 mV/MeV F3 – 5 mV/MeV F3 – 45 mV/MeV F3 – 90 mV/MeV	< 10 ns < 20 ns < 25 ns < 45 ns	< 20 ns < 40 ns < 50 ns < 100 ns

Maximum Noise

Model	0 pF	200 pF	Model	390 pF	1000 pF
F2 – 5 mV/MeV F2 – 45 mV/MeV F2 – 90 mV/MeV F2 – 400 mV/MeV F2 – 450 mV/MeV	< 4.7 keV < 2.2 keV < 2.2 keV < 2.2 keV < 2.2 keV	< 7.6 keV < 4.3 keV < 4.2 keV < 4.1 keV < 4.1 keV	F3 – 1 mV/MeV F3 – 5 mV/MeV F3 – 45 mV/MeV F3 – 90 mV/MeV	< 36.0 keV < 10.5 keV < 5.8 keV < 5.5 keV	< 46.6 keV < 21.5 keV < 13.2 keV < 13.2 keV

Integral non linearity

<± 0.05% (0 ÷ ±10 V 1 kΩ termination)

Energy sensitivity

1/5/45/90/400/450 mV/MeV

Power requirements

Model	+12 V	-12 V	Model	+12 V	-12 V
A1422AxxxF2 (1 ch): A1422BxxxF2 (4 ch): A1422CxxxF2 (8 ch):	12 mA 48 mA 96 mA	4 mA 16 mA 32 mA	A1422AxxxF3 (1 ch): A1422BxxxF3 (4 ch): A1422CxxxF3 (8 ch):	20 mA 80 mA 160 mA	4 mA 16 mA 32 mA

A1422

Low-Noise Fast-Rise-Time Charge-Sensitive Preamplifiers (Boxed)

Ordering Options

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A1422H

A1422C/D

A1422

A1429

A1422E/F

A1442

A422

A422A

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A1422

Low-Noise Fast-Rise-Time Charge-Sensitive Preamplifiers (Boxed)

Ordering Options

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