Product Description

The VATA451 is a 64 channel front-end readout for silicon strip and silicon radiation sensors. The circuit was used in the Focusing Optics X-ray Solar Imager (FOXSI). Each CSA is followed by a slow and a fast shaper. The fast shaper signals are compared with a global trigger threshold. Each channel has a 10-bit ADC with latches. The digitized pulseheight can be read out from a digital multiplexer. A common mode (CM) detector is included on-chip.

Keywords: Focusing optics x-ray solar imager (FOXSI)


  • S. Ishikawa, et al. 2011, “Fine-Pitch Semiconductior Detector for the FOXSI Mission”, IEEE Transactions on Nuclear Science, vol. 58, issue 4, pp. 2039-2046, DOI: 10.1109/TNS.2011.2154342

Product Features

Detectors Silicon
Application Imaging, Spectroscopy, Tracking
Number of inputs 64
Input charge range -1.6 fC to +1.6 fC
Shaping time 4 μs (VA), 0.6 μs/1.2 μs programmable (TA)
Nominal capacitive load 5 pF
Equivalent Noise Charge (ENC) 30e + 7e/pF
Trigger threshold Adjustable
Trigger outputs Common trigger output for all channels
Outputs Serial digitized pulse height
Test and calibration Calibration circuit and ADC test circuit
Power consumption 1 mW / channel