V2740

The CAEN Mod.V2740 Digitizer is a 64-channel digital signal processor for radiation detectors in a VME64 form factor. It offers not only waveform digitization and recording but also Multi-Channel Analysis for nuclear spectroscopy using Silicon strip, segmented HPGe, Scintillation detector with PMTs, Wire Chambers, and others.

Independently for each of the 64 channels, the V2740 can perform pulse height measurements (PHA), and other algorithms that will be gradually developed, such as constant fraction timing (CFD) and pulse shape discrimination (PSD).
Each channel of the module digitizes the analog input, that can be the signal coming from a physics detector, with a 16 bit, 125 MS/s ADC. The sampled data are used to initiate the digital pulse processing sequence, managed in the FPGA at the firmware level. Different firmware types can be selected via software, according to the specific setup and acquisition mode.

• Common trigger: all channels acquire simultaneously with a common trigger. The trigger can be fed externally or generated by a combination of individual channel discriminators. This mode is mainly intended for the acquisition of waveforms, like a digital oscilloscope. Options for zero suppression are available to remove not significant data.

• Independent trigger: suited for trigger-less applications, where no global trigger is needed but each channel acquires waveforms upon its self-trigger which fires through a digital discriminator, independently of the others.

• DPP: real-time processing in the FPGA allows for the extraction of physical parameters from the waveform (e.g. pulse height, charge, timestamp, PSD), well suited for high counting rate applications. It is yet possible to save both raw waves and parameters.

A template of the firmware is available for customers who want to personalize the acquisition to implement custom algorithms for pulse processing in the open FPGA. The user can have control of the data output information and customize the trigger logic to get several combinations of self-triggers and I/O signals to validate or discard the events.
Custom software can run on the onboard CPU for data reduction and analysis. Multi-board synchronization can be implemented via backplane or front panel easy-cabling options.
The communication interface selection offers fast readout options: USB 3.0 type-C and 1/10 Gigabit Ethernet or optional Optical (CONET – CAEN Daisy Chainable Optical Link Protocol ^{Available on request}) Links. The V2740 fits in the single-slot CAEN VME64X u-crate, which allows you to convert the VME digitizer into a desktop board for lab tests.

Supported third-party software:

• SOLARIS DAQ

• PKUCAENDAQ

Moreover, you can check this FAQ to see which CAEN VME crates are suitable for this product.