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IDE3466
Detectors
Application
Number of inputs
Silicon (Si)
Counting
36

IDE3466

36 CSA with Programmable Coincidence Logic and Counters
 

The VATA466 is an application specific integrated circuit (ASIC), which has been designed for the p-side readout of silicon detectors for charged particles. The chip has 36 charge sensitive pre-amplifiers (CSA), programmable coincidence logic and 36 counters, and one analogue multiplexer output. The counters count charge pulses depending on the combination (coincidences or anti-coincidences) and charge magnitude. The counters can be read out from the ASIC by an external controller. Out of the 36 channels, 32 have a high-gain with saturation at 2.6 pC, and 4 have a low gain with saturation at 26 pC. The chip is optimized for positive input charges, i.e., it is suitable for the readout and triggering of the charge from the p-side of silicon sensors.

In the high-gain channels, the charge sensitive pre-amplifier is connected to one slow shaper of 1-μs shaping time and two fast shapers of 250-ns shaping time, while the low-gain channels have only one 1-μs slow shaper and one 250-ns fast shaper. Each fast shaper output is connected to a comparator, which triggers when the pulse shape exceeds the reference level that can be programmed by 10-bit DACs. The two fast shapers and comparators of the high-gain channels are designed to discriminate charges in the range from 2.2 fC to 100 fC and 2.2 fC to 1 pC, respectively. The fast shapers and comparators of the low-gain channels are designed to discriminate charges in the range from 100 fC to 26 pC. Each comparator output is a mono-stable, which can be masked and feeds to the coincidence logic. Read-out of the slow shapers is also possible through a serialised analogue output.

The chip requires positive voltage supplies (+1.8V and +3.3V) and one reference bias current to generate its internal biases. The total power consumption is less than 180 mW, depending on settings and readout rate. The chip has a serial peripheral interface (SPI) for the data readout and programming internal settings. All amplifier inputs are protected by diodes against over-voltage and electro-static discharge (ESD). The chip is SEU/SEL radiation hardened by design and manufacture.

Keywords: JUICE, RADEM

Product Features

Detectors Silicon (Si)
Application Counting
Number of inputs 36
Input charge range 0 fC to 100 fC, 0-2.6 pC, 0-26 pC
Shaping time 1 µs (VA), 250ns (TA)
Nominal capacitive load 10 pF
Equivalent Noise Charge (ENC) 42000e (worst case maximum)
Trigger threshold Programmable by 10-bit DAC
Trigger outputs Common trigger for all channels
Outputs SPI readout of coincidence counters and multiplexed pulse height
Test and calibration Internal calibration circuit