64 CSA, (±16 fC), S&H, ADC in every channel, outputs digitized pulse height and trigger

The VATA450.3 is a 64 channel readout ASIC with CSA (charge sensitive amplifiers) and 10 bit ADCs with latches in every channel. Triggering is generated by a digital threshold applied to 10 bit digital comperators. A common mode (CM) detector is included on-chip. After each readout the threshold value is common mode corrected. Includes dummy channel for on-chip pedestal correction. Two pre-amplifier gain modes are configurable, with input charge range (dynamic range) ±16 fC or ±40 fC. The VATA450.3 has an alternative mode which provides lower noise (98e + 5.3e/pF) with an increased power dissipation (1mW/channel). Data is read out on a serialized digital interface, which also provides the triggering signals.

Keywords: ASTRO-H, soft gamma-ray detector (SGD)
Additional files: IDE-VATA450

Product Features

DetectorsCZT, CdTe
ApplicationTracking, Spectroscopy, Calorimetry
Number of inputs64
Input charge range2 gain settings: ±16 fC, ±40 fC
Shaping time4 μs (VA), 0.6 μs (TA)
Nominal capacitive load6 pF
Equivalent Noise Charge (ENC)65e + 19e/pF
Trigger thresholdAdjustable
Trigger outputsCommon trigger output for all channels
OutputsSerial digitized pulse height
Test and calibrationCalibration circuit and ADC test circuit