IRAC Instrument Handbook - IRSA - California Institute of Technology

2.3 Detectors
2.3.1 Design
Instrument Description 11 Detectors
IRAC Instrument Handbook
The IRAC detector arrays were developed by the Raytheon/Santa Barbara Research Center (SBRC) in
Goleta, CA, under contract to SAO (Hoffman et al. 1998, [13]; Estrada et al. 1998, [8]). Channels 1 and
2 use InSb arrays operating at ~15 K, and channels 3 and 4 use Si:As detectors operating at ~ 6 K. Both
array types use the CRC744 CMOS readout circuit, and the same physical pixel size of 30 µm. The arrays
are anti-reflection coated with SiO (Channels 1, 2, and 3) and ZnS (Channel 4). The power dissipation for
each array is