ams AS5966 CT Sensor Chip

Product status: Pre-Production

The AS5966 is a sensor chip for CT detectors that combines the photodiodes and the readout circuit on a single CMOS chip by using through silicon vias (TSV). This sensor solution, which integrates an array of 10 x 8 photodiodes and an 80-channel ADC on top of each other, allowing the assembly of the pixel array on four adjacent edges of the device.

Featuring on-chip photodiodes, the AS5966 offers high performance for CT detectors across all segments. The TSV technology allows for very low parasitic capacitance between back-side illuminated photodiode and the ADC front-end. This leads to superior image performance that can be achieved because of the very low input-related noise of 0.38 fC at a maximum input current range of 335 nA. The ultra-low power consumption of 0.94 mW/pixel reduces self-heating effects and lowers the overall cost of cooling the system.

The digital data readout can be accessed via a 15 MHz CMOS level interface. An appropriate separate interface is used for device configuration as well as data output operation. An integrated temperature sensor enables monitoring of the junction temperature.

Its 4-side buttability allows to place AS5966 on all four adjacent edges of the IC that enables a wide range of CT detector designs from 20 mm to 160 mm of Z-coverage in ISO center. The AS5966 is directly assembled on a substrate using a soldering and underfill process for manufacturing of the CT tile. AS5966 has a pixel dimension of 1.1x1.02 mm², pixel dimensions can be customized on request.

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