This page contains the Waveform Recording Firmware packages of all CAEN Digitizers
Principle of Operation
The basic operating mode of a digitizer running Waveform Recording FW is essentially the same as a digital oscilloscope: the analog signal, after an input stage of signal conditioning mainly used to adapt the dynamic range, is sampled by a flash ADC, whose output, i.e. the stream of digital samples, is continuously read by an FPGA and stored in a circular memory buffer of a programmable size. At the arrival of the trigger, the buffer is frozen and made available for the readout while the acquisition can continue in a new buffer. However, there are few important differences between a digitizer and a commercial digital oscilloscope:
A. The digitizers allow for dead-timeless acquisition
In fact, unlike most oscilloscopes, they have the ability to accept two consecutive triggers very close to each other thanks to the multi buffer memory management: there is no dead time between an acquisition window and the next one.
It is even possible to accept two trigger for which the acquisition windows overlap. The dead‐timeless acquisition is a very important feature, especially in the case of events randomly distributed in time (in nuclear physics this is typically a Poissonian distribution), so that two of them, even at low rate, can occur at very short distance but you still want to capture both.
Except for 742 and 743 Series.
B. In the digitizers, all the channels are allowed to generate triggers independently
The individual trigger can be used locally by the channel that generated it (independent triggering) or can participate to the assertion of a global trigger for all the channels in the board, as well as to generate a pulse on the TRG‐OUT.
C. Scalability and synchronization of multi‐board systems
In most cases, the applications that require the use of several channels need to synchronize the acquisition across different digitizers. This is performed according to the following points:
Distribution of a common clock reference in order to have the same sampling clock on all the ADC channels. CAEN digitizers feature a programmable PLL able to generate the sampling clocks locked to an external clock input, whose distribution can be done in parallel from a common source, using a fan‐out, as well as through an in‐out daisy chain with the ability to use the first board as a clock master (VME models only).
Alignment of the time stamp associated with the triggers to allow off‐line reconstruction of the events read from different boards. This can be done by using an external signal as well as through an in‐out daisy chain.
Distribution of the triggers from channel to channel and from board to board, according to a certain trigger logic. Each card has different trigger sources: external TRG‐IN from the front panel, software trigger and channel self‐triggers. All these triggers can be combined in order to make coincidences, majorities, global triggers and other functions.
D. High bandwidth data readout links
The digitizers are designed to provide high rate data transfer to a computer or an external data processing unit. CAEN digitizers have a bandwidth of ≈30MB/s in the case of the USB, about 80MB/s with CONET port up to more than 120MB/s for the VME with 2eSST.
The communication interfaces allow the user to operate post-processing data analysis.
All CAEN digitizers are equipped with their proper default firmware for waveform recording. CAENScope and WaveDump softwares are available to manage the acquisition. Data can be saved in real time for offline analysis.
Furthermore, the 742 and 743 families, which come with two different switched capacitor chips, are well suitable for high precision time measurement of fast signals. WaveDump and the dedicated WaveCatcher software (free download) can control the acquisition of the two boards respectively.
Digitizer Waveform Recording FirmwareProduct page
|Name||File extension||File size||Revision||Date|
|x730 Waveform Recording Firmware||CFA||1.26 MB||4.22_0.8||May 13th, 2022|
|DT5724 N6724 Waveform Recording Firmware||CFA||2.84 MB||4.17_0.15||February 22nd, 2018|
|V1724 VX1724 Waveform Recording Firmware||CFA||2.84 MB||4.17_0.15||February 22nd, 2018|
|x740 - x740D Waveform Recording Firmware||CFA||2.99 MB||4.17_0.12||August 14th, 2018|
|x720 Waveform Recording Firmware||CFA||2.93 MB||4.16_0.15||October 18th, 2017|
|x751_Waveform_Recording_FW_CFA||CFA||1.71 MB||4.16_0.7||October 17th, 2017|
|x725 Waveform Recording Firmware||CFA||1.26 MB||4.23_0.8||May 4th, 2021|
|x730S - Waveform Recording Firmware||CFA||5.72 MB||4.23_0.2||May 4th, 2021|
|x742 WaveForm Recording Firmware||CFA||1.82 MB||4.25_1.05||April 12th, 2022|
|x725S Waveform Recording Firmware||CFA||5.73 MB||4.23_0.2||May 4th, 2021|
|Name||File extension||File size||Revision||Last update|
|725-730 Raw Waveform Registers Description||853.81 kB||4||May 13th, 2020|
|740 Raw Waveform Registers Description||1.25 MB||1||April 16th, 2018|
|742 Raw Waveform Registers Description||1,000.49 kB||2||May 23rd, 2022|
|724 Raw Waveform Registers Description||1.27 MB||2||February 22nd, 2018|
|720 Waveform Recording Registers Description||1.28 MB||1||December 3rd, 2018|
|751 Raw Waveform Registers Description||1.24 MB||1||October 17th, 2017|