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64 Channel charge sensitive preamplifier


  • 64-channel
  • Max. output voltage: +/- 4,5V Diff on 100 Ω termination
  • Sensitivities: 20, 45, 90, 200, 400mV / MeV
  • Dimension (mm): 180 x 105 X 25 mm
  • Input bias voltage (± 400 V Max) (2 LEMO-00 connector);
  • ESD input protection
  • TEST pulse input (1 LEMO-00)
  • Low power consumption (< 50 mW for ch.)
  • True Differential output (with 100 Ω Diff. back termination)
  • Noise < 5 KeV on 0 pF input and < 35 eV/pF slope
  • Rise Time < 20 ns @ 0 pF, < 60 ns @ 200 pF


Ultra high density preamplifier for big size segmented silicon and gas detector arrays

The A1429 is a 64 ch. highly integrated charge preamplifier, suitable for single or double sided multi-strip silicon detectors as well as for multi-channel detectors with common Bias. Its compact size and low power consumption make it ideal for direct detector coupling in a high vacuum system. It is equipped with two LEMO-00 Bias inputs, one input for channels from 0 to 31 and a second for channels from 32 to 63.
Furthermore, on the odd channels it is possible to select the Bias to GND with an internal jumper.
The A1429 is available in different sensitivities: 20, 45, 90, 200, 400 mV / MeV.
The preamplifier output signals are in true differential supporting low-cost twisted flat cables for the output connection.
This feature allows to easily couple the A1429 with the new generation digitizer VX2740/VX2745 thus creating a complete chain for the readout of a segmented detector array.

Technical Specifications


Shielded Box
Dimensions (WxHxD): 180 x 105 x 25 mm3 (without connectors)
Weight: 900 g


Positive or Negative Charge Input polarity
Output polarity: Differential

Max Energy Ranges (Si)

– 225 MeV (Si) @ 20 mV/MeV
– 100 MeV (Si) @ 45 mV/MeV
– 50 MeV (Si) @ 90 mV/MeV
– 22 MeV (Si) @ 200 mV/MeV
– 11 MeV (Si) @ 400 mV/MeV

Output voltage

Differential ± 4.5 VDiff max on 100 Ω Term.
Max Output offset: ± 100 mV
Common Offset adjust on Front Panel Trimmer


Model Detector capacitance 0 pF
20 mV/MeV < 5 KeV slope < 28 eV/pF
45 mV/MeV < 4 KeV slope < 28 eV/pF
90 mV/MeV < 4 keV slope < 28 eV/pF
200 mV/MeV < 4 keV slope < 35 eV/pF
400 mV/MeV < 4 keV slope < 35 eV/pF

Rise Time

< 20 ns @ 0 pF detector capacitance
< 60 ns @ 200 pF detector capacitance

Decay time

20 mV/MeV 50 μs
45 mV/MeV 100 μs
90 mV/MeV 50 μs
200 mV/MeV 22 μs
400 mV/MeV 11 μs


Accepts positive and negative input charge pulses from semiconductor detectors and supplies the HV bias to the detector itself; Detector input (AC coupled) – 22 MΩ to HV-IN
ESD input protection
Samtec ERF8-040-01-L-D-RA-L-TR connector
A3429: Adapter to Nr. 4 17×2, 2.54 mm male Header Connectors
Micro-coax cable ERCD series available from Samtec


HV BIAS input / Detector bias voltage
± 400 V Max
Nr.2 LEMO-00 connector
HV-IN[0:31] for ch. 0 to 31


HV-IN[32:63] for ch. 32 to 63
Positive or negative input for the energy calibration via Ctest

  • 20 mV/MeV 2.2 pF
  • 45/90 mV/MeV 1 pF
  • 200/400 mV/MeV 0.5 pF

Nr.1 LEMO-00 connector 50 Ω on request


Power supply input connector
DMini XRL 3 Pin Male
• Pin 1 = +6V
• Pin 2 = GND
• Pin 3 = -6V
Adapter cable to male SubD9 provided (Pin 1,2= GND, Pin 3= +6V, Pin 5 = -6V)


Amplifier Out
Differential ± 4.5 VDiff max
100 Ω Diff. back termination
Nr. 4 17×2, 2.54 mm male Header Connectors

Power Requirements

+6 V < 350 mA (no load)
-6 V < 195 mA (no load)

Energy Sensitivity

20, 45, 90, 200, 400 mV/MeV (Si)


Indoor use


64 Channel charge sensitive preamplifier
Product page
  • Documentation
  • Software
  • Firmware

Data Sheet

Name File extension File size Revision Last update
A1429 - 64 Channel Charge Sensitive Preamplifier PDF 923.07 kB 1 November 8th, 2022





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Safety Information and Product Support Service (ENG/ITA) PDF 1.84 MB - October 24th, 2022




Release Notes: 



Compare with Charge Sensitive Preamplifiers.


Ordering Options

Code Description
WA1429X020AA A1429x020 - 64 Ch. Charge Sensitive Preamplifier 20 mV/MeV   RoHS
WA1429X045AA A1429x045- 64 Ch. Charge Sensitive Preamplifier 45 mV/MeV   RoHS
WA1429X090AA A1429x090- 64 Ch. Charge Sensitive Preamplifier 90 mV/MeV   RoHS
WA1429X400AA A1429x400- 64 Ch. Charge Sensitive Preamplifier 400 mV/MeV   RoHS
WA1429X200AA A1429x200- 64 Ch. Charge Sensitive Preamplifier 200 mV/MeV   RoHS


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