ASIC for high rate 3D position sensitive detectors

We report on the development of an application specific integrated circuit (ASIC) for 3D position-sensitive detectors. The ASIC is designed to operate with pixelated wide band gap sensors like Cadmium-Zinc-Telluride (CZT), Mercuric Iodide (HgI2), and Thallium Bromide (TIBr), and it measures, corresponding to an ionizing event, the energy and timing of signals from 128 anodes and two cathodes. Each channel provides low-noise charge amplification, high-order shaping with peaking time adjustable from 250 ns to 12 μs, gain adjustable to 20 or 120 mV/fC (3.2 MeV or 530 keV in CZT), discrimination with 5-bit trimming, and positive and negative peak- and timing-detections. The readout can be full or sparse, based on a flag and single- or multi-cycle token. All channels, triggered only, or triggered with neighbors can be read out thus increasing rate capability of the system to more than 10 kcps. The ASIC dissipates 330 mW which corresponds to about 2.5 mW per channel.