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We are developing detector readout integrated circuits (ROICs) for X-ray and Gamma-ray spectroscopy. The ROICs are applications specific (ASICs) for satellite instrumentation in space. The ICs described in this article belong to the VATA family with integrated analog-to-digital converters (ADCs) for fully digital readout of x-ray and gamma-ray detectors. The VATAs are ideal for the readout of cadmium zinc telluride (CZT), cadmium telluride (CdTe), silicon pads and strips, and large area avalanche photodiodes (APDs) with scintillators.