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Next-generation CT imaging with photon counting for precise, lower-dose diagnostics.

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ams TMF8829 48x32 multi-zone Time-of-Flight sensor

Product status: Pre-ProductionThe TMF8829 is a direct time-of-flight (dToF) sensor with configurable resolution of 8x8, 16x16, 32x32 & 48x32. The device is based on SPAD, TDC, and histogram technology and achieves a detection range of up to 11000 mm with an 80° field of view. All processing of the raw data is performed on-chip, and the TMF8829 provides distance information along with confidence values, signal amplitude, and ambient light on its interface. Internally, the TMF8829 uses dToF histograms and peak detection, and therefore, it is highly tolerant to smudges on the cover glass. Additionally, the TMF8829 can handle multiple objects per depth point simultaneously without degrading accuracy. It reports the distance of all depth points with a resolution of 0.25 mm. The device uses an I3C (I²C compatible) communication interface and a fully featured SPI interface for control and raw data streaming. A VBUS supply pin allows operation of the I²C/I3C or SPI with 1.2V, 1.8V, or 3V I/O supplies. Raw data streaming, including all algorithm peak detection results, allows further processing on the host for “AI-enabled” applications. The TMF8829 is a fully contained optical module measuring only 5.7 mm x 2.9 mm x 1.5 mm.

ams AS5920M Photon Counting Module

Product status: Pre-Production The AS5920M is a 72x24 pixel, four-side buttable module solution for photon counting applied for spectral computed tomography detectors. The 1728-channel proprietary Buttable System-In-Package (BSIP) integrates three AS5920 photon counting ICs as well as passive components. The BSIP allows on the top side to form electrical connections to the direct conversion CdTe or CZT sensor material, which converts each X-ray photon into charge pulses. The bottom side of the BSIP forms the digital interface to the FPGA, supply connections as well as the thermal heat dissipation to the carrier. During a CT scan, the AS5920 IC counts the X-ray photon generated charge pulses with an amplitude proportional to the energy deposited by the photon. 576-channel per AS5920 discriminates the incoming photon energy by counting the number of pulses exceeding 5 different energy thresholds. The threshold levels are adjustable by 8-bit DACs with a step size of typ. 0.7 keV/LSB, the number of comparators enabled per channel are selectable for power optimizations. Lowest power dissipation with all 5 comparators enabled is as low as typ. 0.64 mW/pixel in non-paralyzable mode having BLR enabled and typ. 0.58 mW/pixel in paralyzable mode with only static leakage compensation. A 15-bit counter register accumulates the comparator output events and transmits 14/16-bit LVDS data within an integration time of minimum 104 µs. During its maximum frame rate of 9615 Fps, the AS5920 transfers the output data via a high-speed LVDS interface to the FPGA, the device operates up to an input count rate of 250 Mcps per pixel (2 Gcps/mm²). The AS5920 has both paralyzable and non-paralyzable counting mode implemented that are selectable via SPI. In paralyzable mode, it allows for a maximum output count rate of 15 Mcps/pixel (120 Mcps/mm²) at 25 keV and exceeding 40 Mcps/pixel (>320 Mcps/mm²) in non-paralyzable mode. The signal chain of the AS5920 with its low-noise charge sensitive amplifier (CSA) and its high-speed shaper allows for lowest electronic noise of 330 electrons resulting in an ASIC-intrinsic energy resolution of the measured photon of 3.5 keV FWHM. The photon counting IC AS5920 features an on-chip voltage reference and internal temperature sensor and is embedded in the AS5920M. The AS5920M is delivered as 1728-channel, 4-side buttable module integrating three ICs in one 24.52 mm x 8.75 mm Buttable System-In-Package (BSIP). Pixel sizes of the BSIP are 341 µm x 365 µm and customizable for pixel pitch of 340 µm and above. The performance temperature range of AS5920 and AS5920M is specified from 20°C to 70°C. Recognized for its technical excellence, the AS5920M has been awarded the 2025 Best of Sensors Award for Best Imaging & Optical Sensing Solution. Gain deeper insights about Photon Counting

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