New 256-channel ADC from ams OSRAM reduces power and design complexity in high-performance CT detectors
- AS5911 in 14mm x 14mm FBGA is a system-in-package solution for current-to-digital conversion of 256 photodiode outputs
- Per-channel power consumption of 1.25mW minimizes self-heating in the CT detector and reduces thermal management requirements
- Best-in-class power to noise performance allows for the highest image quality of next generation CT scanners
- AS5911 ADC is set to play a key role in next generation of high-performance medical and security CT scanners demanding reduced complexity at superior performance
Josef Pertl, Senior Product Manager for medical imaging at ams OSRAM, said: ‘The AS5911 is superior across the board in the domain of specialist ADCs for high-end CT detectors today, smaller, lower-power, high performance, more integrated, and easier for system designers to work with. Use of the AS5911 reduces complexity for manufacturers of CT detector modules of a plurality of form factors, including 4-side buttable CT detectors. It provides best-in-class power to noise performance to achieve highest image quality of next generation CT scanners. This helps medical practitioners to improve diagnostic value, and it ultimately leads to better outcomes for patients.’
The AS5911, housed in a 14mm x 14mm FBGA, is a system-in-package solution that performs simultaneous current-to-digital conversion of the outputs from 256 photodiodes in a CT detector.
Smaller than current competing specialist ADCs for CT detectors, the AS5911 has a reduced footprint that facilitates its integration in a variety of detector form factors, including 4-side buttable solutions thanks to its reduced external bill of materials (BOM) and embedded components. The AS5911 leads to lower system complexity by having integrated LDO voltage regulators, reference voltages, a temperature sensor, supply decoupling capacitors and on-chip calibration features.
The power dissipation is yet an additional significant benefit of the AS5911. At just 1.25mW per channel in low-power mode, it consumes less power than existing products on the market. Its low power consumption facilitates temperature stabilization strategies by CT scanner manufacturers, ultimately yielding better system performance and potential savings in thermal management.
The ams OSRAM proprietary ADC architecture, which features zero dead time, exhibits an excellent power-to-noise trade off. In low-noise mode, the input-referred noise is below 0.29fC at an input current range of 0.5µA. Low noise is a hallmark of high-performance CT detectors, a critical aspect for image quality, specifically at low X-ray dose.
The AS5911 features on-chip calibration functions for parameters such as offset voltage, linearity, offset charge and leakage current. This allows to automatically set the photodiode and the front-end at their ideal operating point, compensating for offsets and non-linearities of the signal chain. The embedded auto-calibration functions reduce development effort in the data acquisition system and potentially enable the use of a lower-cost FPGA requiring less computational power.
The reduction of complexity of CT detector module design is also supported by features such as built-in diagnostics and the freedom to operate the device in two different power supply strategies. The device can operate in true ground mode and single analog supply. Full-scale range, power modes and digital readout features, are configurable over a SPI-compatible serial interface, as well as the data output modes of the digital LVDS interface.
The AS5911 is available for sampling now. Evaluation boards are available directly from ams OSRAM for performance measurements.
For sample requests or for more information, please visit our website.
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About ams OSRAM
The ams OSRAM Group (SIX: AMS) is a global leader in optical solutions. By adding intelligence to light and passion to innovation, we enrich people’s lives. This is what we mean by Sensing is Life.
With over 110 years of combined history, our core is defined by imagination, deep engineering expertise and the ability to provide global industrial capacity in sensor and light technologies. We create exciting innovations that enable our customers in the automotive, consumer, industrial and healthcare sectors maintain their competitive edge and drive innovation that meaningfully improves the quality of life in terms of health, safety and convenience, while reducing impact on the environment.
Our around 22,000 employees worldwide focus on innovation across sensing, illumination and visualization to make journeys safer, medical diagnosis more accurate and daily moments in communication a richer experience. Our work creates technology for breakthrough applications, which is reflected in over 15,000 patents granted and applied. Headquartered in Premstaetten/Graz (Austria) with a co-headquarters in Munich (Germany), the group achieved over EUR 5 billion revenues in 2021 and is listed as ams-OSRAM AG on the SIX Swiss Exchange (ISIN: AT0000A18XM4).
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