+33 1 85 41 13 90


Multi-purpose SiPM analogue read-out chip


Radioroc 2 is a 64-channel front-end ASIC designed to readout silicon photo-multipliers (SiPM).
Radioroc 2 allows triggering down to 1/3 p.e. and provides dual-gain energy measurement with excellent Signal-to-noise ratio on the high gain (SNR over 10 for single p.e.) and large dynamic range on the low gain. Moreover, Radioroc 2 can output the 64-channel triggers with jitter expected as low as 35 ps FWHM on a single p.e. (ASIC only). Photo-counting is foreseen over 100 MHz.
An adjustment of the SiPM high-voltage (gain) is possible using a channel-by-channel 8-bit DAC connected to the ASIC inputs. Channel-by-channel calibration on the trigger threshold is also possible thanks to 6-bit DACs. Radioroc can be calibrated using the dark noise of the SiPM.
Timing resolution better than 35 ps FWHM is possible along with 1% linearity energy measurement up to 2000 p.e, the dynamic range being limited by the 1.2 V power supply on the input analogue pad. The power consumption is 3.3 mW per channel.

TRL Technology Readiness Level  4 - ASIC validated in lab environment
Available versions
  • Radioroc 2 : available June 2024
Detector Read-Out  SiPM, SiPM array
Number of Channel 64
Signal Polarity Positive
Sensitivity Trigger on 1/3 photo-electron
Timing Resolution 

Better than 55 ps FWHM on single photo-electron (measured)

Dynamic Range up to 2000 photo-electron @ 106 SiPM gain - Peaking time from 20ns to 2us for PSD
Packaging & Dimension 
  • FC-BGA 516 20x20mm (Low-inductance flip chip)
Power Consumption

310 mW  - supply voltage 1.2V

Inputs 64 analogue inputs with independant SiPM HV adjustments
  • 2 outputs per channel, either :
    • 64 LVDS triggers
    •  2 x 64 TTL triggers
    • 64 TTL triggers and 64 analog outputs
  • 2 multiplexed analogue outputs
  • 3 NOR64 trigger outputs
Internal Programmable Features
  • 64 HV adjustment for SiPM (64 x 8 bits)
  • 3 trigger threshold tuning (10bits)
  • Channel-by-channel gain and shaping time adjustment (τ = 20 ns to 300 ns)
  • Individual trigger masking and cell powering.
Evaluation systems
  • Evaluation board : Available June 2024

Radioroc Block Scheme