In recent years, medical CT equipment is developing in the direction of multiple layers, low X-ray dose, shortened time-to-market, and lower system cost. These four trends not only require ADCs to have higher integration, smaller size, and lower power consumption. Power consumption and extremely low noise also require chip manufacturers to provide system-level support and reference designs, as well as a coherent product roadmap.

In recent years, medical CT equipment is developing in the direction of multiple layers, low X-ray dose, shortened time-to-market, and lower system cost. These four trends not only require ADCs to have higher integration, smaller size, and lower power consumption. Power consumption and extremely low noise also require chip manufacturers to provide system-level support and reference designs, as well as a coherent product roadmap.

“These are exactly the value of ADI.” Wang Sheng, market manager of the medical industry in the Asia-Pacific region of ADI, said that compared with the ADAS1128 launched five years ago, the most significant improvement of the ADAS1131 is that the number of channels has been increased from 128 to 256. “The higher number of slices is one of the main factors in the CT scanner’s ability to provide higher image quality, which inevitably requires an increase in the number of data acquisition channels required to process the images. By reducing the cost per channel of the data acquisition circuit, ADI has Lowers the overall cost of the CT system.”

How Chip Innovation Meets System-Level Challenges in Medical Electronics
How Chip Innovation Meets System-Level Challenges in Medical Electronics

The ADAS1131 incorporates 256 low-power, low-noise, low-input current integrators, simultaneous sample-and-hold circuits, and two high-speed ADCs that provide configurable sampling rates. It also integrates all relevant internal buffers, decoupling for data acquisition and bypass capacitors, further reducing component count and simplifying board layout. It is understood that if the data acquisition of the same number of channels is realized, the PCB board area required by the device is about 33% less than that of the device with half the channel density. With the 0.8mm pin pitch package feature, designers can mount the ADAS1131 on a standard PCB substrate, which is lower cost and higher yield than high-density dedicated PCB substrates that require laser vias.
  
Compared with the PCB layout of ADAS1128, ADAS1128 adopts double-layer analog input circuitous wiring, and the trace width and spacing are usually 3mil/3mil, using laser, blind via, and buried via technology; ADAS1131 uses four-layer analog input circuitous wiring , the trace width and spacing can be 4mil/4mil, and the cost can be further reduced by using 6mil through-hole via technology. In terms of packaging, the ADAS1128 is a 10mm × 10mm BGA package, and the ADAS1131 is a 15 mm × 15 mm BGA package. The ADAS1131 increases the package area due to the integrated capacitors for the power supply and voltage reference. 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.
  
Medical imaging, sign signal monitoring, medical instrumentation, and consumer/mobile healthcare are the four major areas that ADI currently focuses on in the healthcare market, basically covering CT, ultrasound, MRI, monitor, electrocardiogram, blood glucose meter, heart rate HRM, biochemical Common healthcare equipment such as analyzers, blood analysis, exercise monitoring, home clinics, etc.

How Chip Innovation Meets System-Level Challenges in Medical Electronics

Wang Sheng said that ADI will focus on three aspects for the medical industry: in the field of medical imaging and sign signal monitoring, system breakthroughs will be achieved by integrating key analog functions in chips; in nursing and home medical care, performance and reliability will be improved while reducing cost and power consumption, and improve interoperability and ease of use; and third, merging patient motion monitoring, diagnostics, and wireless communications to support key building blocks for next-generation telehealth systems.

He listed several ADI products and solutions that are currently well-received in the market, including: ADAS1256COF, a detector front-end for digital flat Panel X-ray machines, which is a 256-channel high-precision, highly integrated Chip-on-Flex analog front-end A module that enables single-chip multi-channel charge-to-digital conversion with excellent noise performance and image quality across multiple power mode options. The ADAS1256 features versatile power modes ranging from 1 mW to 3 mW per channel, allowing manufacturers to use multiple digital X-ray imaging modalities, and a single device can meet medical device designers’ growing demand for high-performance portable and wireless digital X-ray products. need.

The AD9671 is an 8-channel ultrasound receiver designed for mid- to high-end portable and cart-based ultrasound systems, with an integrated on-chip standard JESD204B serial interface. Compared with other data interface standards, 80% of the ultrasound system I/O data lines can be reduced while achieving the same data throughput. While simplifying the circuit board design of ultrasound equipment, it is more in line with the industry’s requirements for higher data rates, higher Requirements for higher number of channels and better image resolution.

With the rapid rise of portable medical equipment, ADI has also introduced the AD8232, a single-lead analog front-end designed for the ECG signal conditioning requirements of fitness equipment, portable/wearable monitoring equipment and remote health monitoring equipment. The ADAS1000 series ECG acquisition front-end can complete applications such as ECG, heart rate monitoring, and respiration/pacemaker pulse detection with extremely low cost and power consumption. In addition, more competitive optoelectronic measurement modular solutions have been launched one after another.

In addition, there is the ADuCM350MOC (Meter-On-Chip) for portable device applications which includes an ARM Cortex-M3 based processor, memory and all I/O connections to support devices with Display, USB communication and active sensors The portable meter can measure voltage, current and impedance signals, especially physiological impedance measurement. And 3-axis accelerometer ADXL362, known as the industry’s lowest power accelerometer, can be used for pedometer, fall detection, motion detection and other applications.

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