A detector unit for a detector array of a radiation imaging modality, comprising: a radiation detection sub-assembly comprising a scintillator and a photodetector array ; an electronics sub-assembly comprising: an analog-to-digital (A/D) converter enclosed within a molding compound ; a substrate disposed at a first surface of the electronics sub-assembly and configured to electrically couple the electronics sub-assembly to the photodetector array ; a first coupling element configured to electrically couple the A/D converter to the substrate ; and a first interconnection layer disposed between a first surface of the substrate and the photodetector array to electrically couple the substrate to the photodetector array ; characterized by the first coupling element defining: an analog signal route through the first coupling element in a first direction, from the substrate to the A/D converter ; and a digital signal route back through the first coupling element in a second direction opposite the first direction, from the A/D converter to the first substrate . a radiation detection sub-assembly comprising a scintillator and a photodetector array ; an electronics sub-assembly comprising: an analog-to-digital (A/D) converter enclosed within a molding compound ; a substrate disposed at a first surface of the electronics sub-assembly and configured to electrically couple the electronics sub-assembly to the photodetector array ; a first coupling element configured to electrically couple the A/D converter to the substrate ; and a first interconnection layer disposed between a first surface of the substrate and the photodetector array to electrically couple the substrate to the photodetector array ; characterized by the first coupling element defining: an analog signal route through the first coupling element in a first direction, from the substrate to the A/D converter ; and a digital signal route back through the first coupling element in a second direction opposite the first direction, from the A/D converter to the first substrate . an analog-to-digital (A/D) converter enclosed within a molding compound ; a substrate disposed at a first surface of the electronics sub-assembly and configured to electrically couple the electronics sub-assembly to the photodetector array ; a first coupling element configured to electrically couple the A/D converter to the substrate ; and a first interconnection layer disposed between a first surface of the substrate and the photodetector array to electrically couple the substrate to the photodetector array ; characterized by the first coupling element defining: an analog signal route through the first coupling element in a first direction, from the substrate to the A/D converter ; and a digital signal route back through the first coupling element in a second direction opposite the first direction, from the A/D converter to the first substrate . an analog signal route through the first coupling element in a first direction, from the substrate to the A/D converter ; and a digital signal route back through the first coupling element in a second direction opposite the first direction, from the A/D converter to the first substrate . <EOS>