Photomultiplier-tubes read-out chip
MAROC 3A is a 64-channel front-end ASIC designed to readout negative fast input current pulses such as those provided by Multi Anode Photo Multipliers. Each channel provides a 100% trigger rate for signal greater than 1/3 photoelectron (50fC) and a charge measurement up to 30 photoelectrons (~ 5 pC) with a linearity of 2%. The gain of each channel can be tuned between 0 and 4 thanks to an 8 bit variable gain preamplifier allowing to compensate the non- uniformity between detector channels. A slow shaper combined with two Sample and Hold capacitors allows storing the charge up to 5 pC as well as the baseline. In parallel, 64 trigger outputs are obtained thanks to two possible trigger paths: one made of a bipolar or unipolar fast (15 ns) shaper followed by one discriminator for the photon counting and one made with a bipolar fast shaper (with a lower gain) followed by a discriminator to deliver triggers for larger input charges (> 1 pe). The discriminator thresholds are set by two internal 10-bit DACs. A digital charge output is provided by an integrated 8, 10 or 12 bit Wilkinson ADC.
| TRL Technology Readiness Level | 9 - Full system running ASIC , reliability proven |
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| Available versions |
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| Detector Read-Out | MAPMT, SiPM |
| Number of Channel | 64 |
| Signal Polarity | Negative |
| Sensitivity | Trigger on 1/3 photo-electron or 50fC with a 106 PM gain |
| Timing Resolution |
60ps RMS on single photo-electron, threshold 1/3 of photo-electron |
| Dynamic Range | 5 pC (106 PM gain), Integral Non Linearity : 2% up to 5 pC |
| Packaging & Dimension |
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| Power Consumption |
3.5 mW/ch, power supply=3.5V |
| Inputs | 64 currents inputs |
| Outputs |
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| Internal Programmable Features |
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| Evaluation systems |
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Photomultiplier-tubes read-out chip
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