ADI has introduced the new 256-channel, 24-bit current-to-digital converter module ADAS1131 for CT and other devices. The new converter is said to maintain a power consumption of 3mW per channel at any throughput rate, the same as competing devices with only 128 channels. .
In recent years, medical CT equipment is moving toward multi-layer numbers, low X-ray doses, shorter time-to-market, and lower system cost. These four trends require ADCs with higher integration, smaller size, and lower Power consumption and extremely low noise also require chip vendors to provide system level support and reference designs, as well as a coherent product roadmap.
"These are exactly the ADI value lies." ADI Asia Pacific marketing manager Wang Sheng said the medical industry, launched five years ago, compared ADAS1128, ADAS1131 most significant improvement is the number of channels from the 128 to the 256 upgrade. "Higher levels are one of the main factors that CT scanners can provide for higher image quality, and this is bound to increase the number of data acquisition channels required to process images. ADI reduces the cost per channel of the data acquisition circuit. Reduce the total cost of the CT system."
The ADAS1131 contains 256 low-power, low-noise, low-input current integrators, synchronous sample-and-hold circuits, and two high-speed ADCs that provide configurable sample rates. It also integrates all associated internal buffers for decoupling data acquisition. And bypass capacitors further reduce component count and simplify board layout. It is understood that if the same number of channels of data acquisition is achieved, the device requires approximately 33% less PCB area than the device with half the channel density. With a 0.8mm pitch-to-pitch package, designers can mount the ADAS1131 on a standard PCB substrate. This solution is less expensive and has a higher yield than a high-density dedicated PCB substrate that requires laser vias.
In terms of PCB layout compared to the ADAS1128, the ADAS1128 uses dual-layer analog input routing, with trace widths and spacing typically 3 mils/3 mils, with laser, blind via, and buried via technology. The ADAS1131 uses four layers of analog input bypass wiring. The trace width and spacing can be 4 mil / 4 mil, with 6 mil through-hole via technology, the cost can be further reduced. For packaging, the ADAS1128 is available in a 10mm x 10mm BGA package and the ADAS1131 is available in a 15 mm x 15 mm BGA package. The ADAS1131 has an increased package area due to the integration of the power supply and voltage reference capacitors. However, from the perspective of system-level design, the overall design space is more streamlined, and the overall performance and cost of the system are optimal.
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