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MAROC 3A

Photomultiplier tubes read out chip

Features

    • Optimized for MA-PMT
    • Number of channels: 64
    • Type of measurement: Self triggered, Charge integration, Photon counting, Time (trigger)
    • 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)
    • Input Polarity: Negative
    • Main performances: Energy measurement, Photon counting 30MHz, MA-PMT gain adjustment
3 Years Warranty
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Overview

MAROC3A IS DEPRECATED – NOT RECOMMENDED FOR NEW DESIGN Please consider Poproc for new design

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.

Technical Specifications

Detector Read-Out

MA-PMT

Number of Channels

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

TFBGA353

Power Consumption

3.5 mW /ch, power supply= 3.5V

Inputs

64 current 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 outputs, 64 trigger masks
Evaluation systems

Evaluation board : Available – 64 channels

Compare

Compare with Weeroc chip.

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Ordering Options

Code Description
WWMAROC3ABAA MAROC 3A - Photomultiplier tubes read out chip - BGA (Ball Grid Array)  

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