About
Summary
IDE3381 APOCAT – the Array of Photon Counters Above Threshold is an integrated circuit (ASIC) for reading out up to 16 photomultiplier tubes (PMTs) and silicon photomultipliers (SiPMs). With scintillators, it is ideal for high-resolution x-ray and gamma-ray pulse-height spectroscopy, or photon timing and 4-bin energy resolved photon counting at high data rates up to 1Mcps per channel, synchronously or asynchronously per channel. The ASIC was originally designed for space missions, but thanks to on-chip ADC and versatile registers, it can be programmed for other use cases including low-power terrestrial applications with PMTs and SiPMs.”
General Description
Product Features
Detectors | SiPM, PMT |
Application | x-ray and gamma-ray spectroscopy, timing, counting, and imaging |
Number of inputs | 16 INA, or 17 INB |
Input charge range | Depends on programmable settings: Max. charge at INA: -40pC, -100pC, -200pC, -400pC, -800pC depending on setting. Max. charge at INB: +/-40pC In addition, 6 fine gain tunings, individual for each channel [mV/pC]: 46, 48, 51, 53, 55, 265 |
Shaping time | Globally programmable: 50ns, 150ns, 300ns, 2000ns |
Nominal capacitive load | <= several nF at INA <= 100pF at INB |
Equivalent Noise Charge (ENC) | Depending on shaping time: 7fC at 50ns, 15fC at 150ns, 31fC at 300ns |
Trigger threshold | 10-bit programmable, individually for each channel |
Trigger outputs | One global OR from all channels; in addition, each channel has individual trigger output (DOUT) |
Outputs | Each channel has one analog output (AOUT) |
Test and calibration | Injection of calibrated charge, or generation of internally calibrated and programable charge |
Power consumption | 360mW using INA and on-chip ADC; flexible and programmable power-down options |
Max. event detection rate | 1Mcps/channel asynchronous or synchronous |
ADC Resolution | 12-bit |
Data interface | SPI for programming and counter readout; ADC serial digital output |
Radiation hardness | Based on tests with other ASICs designed in the same technology. TID: up to 340 krad(Si) without relevant change; SEL: up to 137 MeV cm2 / mg without latch-up; SEU/SET: LET threshold 18 MeV cm2 / mg or larger |
Input voltage range | +3.3V |