CITIROC 1A

Overview

Important Notice – CITIROC 1A Lifecycle Update
The CITIROC 1A ASIC is approaching its end of life due to technology obsolescence, and a final production run is planned in the coming months. In anticipation of this, and given the wide adoption of the device, CAEN has secured a significant stock of CITIROC 1A (BGA version).
Based on our current forecasts, this stock will allow us to guarantee the availability of the ASIC for at least 2–3 years. For CAEN products using CITIROC 1A (A5202 / DT5202), we expect to be able to supply new units for 2–3 years and to provide maintenance and service support for approximately 10 years.

Therefore, these products will remain fully available and supported for the foreseeable future.

In parallel, as part of our long-term roadmap, RADIOROC has been selected as the successor ASIC for future developments. CAEN is currently developing a new FERS-family product based on RADIOROC (A5204 / DT5204), which will be available soon.
Specifically, CAEN will not transition away from CITIROC-based solutions until RADIOROC has proven itself and is well established in the field.
If you have ongoing or planned projects based on CITIROC 1A, please feel free to contact us so we can review your needs and provide guidance on both current and future product options.

CITIROC 1A is a 32-channel front-end ASIC designed to readout silicon photo-multipliers (SiPM) for scientific instrumentation application.
CITIROC 1A allows triggering down to 1/3 pe and provides the charge measurement with a good noise rejection. Moreover, CITIROC 1A outputs the 32-channel triggers with a high resolution timing (better than 100 ps).
An adjustment of the SiPM high-voltage is possible using a channel-by-channel DAC connected to the ASIC inputs. That allows a fine SiPM gain and dark noise adjustment at the system level to correct for the non-uniformity of SiPMs. CITIROC 1A can be calibrated using a unique calibration signal.
Timing measurement better than 100 ps RMS jitter is measured on single photo-electron along with 1% linearity energy measurement up to 2500 p.e. The power consumption is 225mW/ASIC when all stages are ON.