Maroc 3A
Photomultiplier-tubes read-out chip
Description
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.
Parameters
| Parameters | Value |
|---|---|
| TRLTechnology Readiness Level | 9 - Full system running ASIC , reliability proven |
| Available versions | - Maroc 3a : available - Maroc 3 : discontinued |
| Detector Read-Out | MA-PMT |
| Number of Channel | 64 |
| Signal Polarity | Negative |
| Sensitivity | Trigger on 1/3 photo-electron |
| 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 | - PQFP240 (deprecated) - TFBGA 353 12x12mm |
| Power Consumption | 3.5 mW/ch, power supply=3.5V |
| Inputs | 64 currents inputs |
| Outputs | - 64 trigger outputs - OR of the 64 triggers for each of the 2 discriminators - 1 multiplexed analog charge output - 1 digital charge measurement (8, 10, or 12 bits) |
| Internal Programmable Features | - Gain adjustment between 0 and 2 over 8 bits for each input preamp - Trigger threshold adjustment (10bits) - Analog and digital charge measurement - 64 trigger masks |
| Evaluation systems | - Evaluation board : Available - 64 channels |
Diagram
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