At this time, chips with higher performance and lower power consumption have become inevitable. "The industry has been looking forward to these two chips," Zhou Wensheng, senior business manager at ADI Greater China, told the world of electronic engineering.
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What exactly is this two chips?
True "single core"
Referring to the newly introduced eight-channel ultrasonic receivers AD9272 and AD9273, Zhou Wensheng is more willing to describe it as a true "single-core" solution. Along with the previous AD9271, the AD927x replaces the previous discrete solution with a single-chip integrated with eight channels, each containing a low noise amplifier (LNA), a variable gain amplifier (VGA), and an anti-resistance. Aliasing Filter (AAF) and a 12-bit analog-to-digital converter (ADC).
“Compared with digital technology, analog technology relies more on accumulation,†Zhou Wensheng said with emotion. From the previous discrete solutions to the "single core" solution, from the AD9271 to today's AD9273, AD9273, it seems that the function of the analog product is only a small step forward, and actually contains a lot of process background. Among them, the most precious thing is that ADI has such accumulated old engineers: they worked at ADI when the company was founded. Now they are six or seventy years old, still working for ADI, they can even shoot the CEO. Chatting casually on the shoulders. At the same time, with the shift of product platform, more and more companies are moving towards the solution. Therefore, ADI has also added a lot of system integration engineers, and personnel have become the core strength of ADI market share.
Compared with ADI's sales of $2.43 billion in fiscal year 2007, the share of medical electronics is about 5%, which is not large compared to the traditional dominant end market, industrial and instrumentation, consumer products, and wireless infrastructure. But the average annual growth of around 18% is still not to be underestimated. At the same time, medical electronics has also been regarded by many businesses as the next round of competition after PCs and mobile phones.
In the traditional sense of medical electronics, it can be divided into five parts - imaging, patient monitoring, instrumentation, consumer and implantable devices. Among them, medical imaging includes CT, ultrasound, digital X-ray machine, MRI. Currently, the most popular ones in the world are ultrasonic and digital X-ray machines (formerly X-ray machines before 2000, this digitization is faster). At present, there are fewer manufacturers producing CT in China, and GE and Neusoft are familiar. At the same time, MRI is not very mature in China. Most of ADI's medical business comes from medical imaging systems.
The categories of patient monitoring are more often referred to as electrocardiographs, pulse oximeters, ventilators, and automatic external defibrillators. For example, high-risk patients need to carry a pulse oximeter with GPS function, which can locate the patient's position by satellite. If a problem occurs, the patient can be rescued through the nearest ambulance center.
Instrumentation is mainly analysis. Such as blood analysis, urine analysis, etc.
The remaining two parts of consumer and implantable devices, ADI is doing less, but also very concerned. In the past ten to twenty years, consumer products have become more popular in Europe and the United States, and glucose monitors, ear thermometers, and blood pressure and heart rate monitors are among these products. Implantable devices are generally integrated small systems that detect your blood sugar concentration. When the concentration is greater than a certain level, you need to release the drug. This drug has been implanted in your body, and it will stimulate the release of this drug. Drugs, this technology is not available in China, but it has been very popular abroad.
Balance of performance and power consumption
With the launch of this new product, ADI is still targeting its main business source, Imaging, the AD9272 and AD9273. These two chips have greater flexibility and customers have more choices. The AD9272 features the industry's lowest terminal noise for high- and mid-range cart-type ultrasound equipment that requires superior image quality; the AD9273 offers the highest power efficiency in its class to meet the needs of portable ultrasound systems. Unlike the AD9271, the AD9272 and AD9273 are the second generation of ADI's chips. The AD9271 is the world's first fully integrated chip. The AD9272 has a larger dynamic range than the AD9271, but consumes almost the same power. The AD9273 signal noise is similar to that of the AD9271, but the power consumption can be very low.
When operating in a real-world environment, the AD9272 has low noise and optimum dynamic range at 5MHz, with an input-to-input noise of only 0.75 nV/rtHz and an input dynamic range of 6 dB/rtHz higher than comparable devices. For portable ultrasound equipment, the AD9273 emphasizes low power consumption, with less than 100 mW per channel at 12-bit, 40 MSPS, helping to extend the battery life of ultrasound equipment.
The AD9272 and AD9273 feature variable gain ranges up to 42 dB, an optional anti-aliasing filter, and are pin compatible with other products in the same family of ADI. The conversion rate of the AD9272's built-in ADC is up to 80 MSPS; the AD9273's built-in ADC has a conversion rate of up to 50 MSPS. The AD9271 has a variable gain range of 30 dB and a built-in ADC with a conversion rate of up to 50 MSPS.
By improving the performance of the chip, the AD9272 and AD9273 bring more improvements to the ultrasound system: first, it can change the resolution of the imaging and obtain deeper perspective, which is determined by the dynamic range. The increase in dynamic range itself can detect weaker signals, while also increasing the dynamic range between very small signals and large signals, so that very shallow images can be obtained in very shallow skins. At the same time, due to the improvement of the low noise function of the front end, it also makes the observation of tissue and blood flow clearer.
With its smaller form factor and lower cost, portable ultrasound equipment is undoubtedly the first choice for ambulances, field hospitals, and bedsides. At the same time, it has a longer battery life and higher reliability. This is the benefit of consistency. The original system solution is designed with eight channels, each channel is operated by several chips, between chips. Inconsistent inconsistency, and consistency within a chip is very good.
Fully programmable - SPI interface
“Every time we talk to the ultrasound R&D engineers about R&D, they all feel headaches,†Zhou Wensheng said. Because there are a lot of integrators in the datasheet, I don't know how to set them up.
Because two years ago, most of the domestically produced ultrasound systems were black and white, with 32 channels, and even 24 channels. More than 64 channels are color ultrasound, and now the most concentrated one is 128 channels. Now 250 channels do have many people doing product research and development, but still dominated by 128 channels. There are many chips in each channel, so if you open the ultrasound, you can see the dense analog front end.
At this point, the design engineer can optimize the architecture through the SPI Tuning Integrator to achieve the best dynamic range and battery life required. This is a programmable SPI interface software, but there are many parameters inside it, and these parameters are tested and the software is completely free. It is also completely free.
Now, after selecting the chip, such as termination, frequency impedance, input voltage, frequency, low noise, attenuation, PGA, cutoff frequency, etc. can all be set, when all these settings are completed, run a lot of results, this what's the result? This result is the value you expect to get, and if not what you expect, you can adjust it to meet your design needs. Then output it to form a text file, which can be directly attached to the program. "This we think is very very creative," Zhou Wensheng said.
It is reported that the AD9272 and AD9273 are designed for interfacing with the AD8339. The AD8339 is a four-channel programmable I/Q demodulator with phase shifter, which is ideal for continuous wave Doppler ultrasound systems. The AD9272 and AD9273 can also be used with the following Analog Devices products: AD8021 low noise high speed amplifier; AD7980 16-bit, 1 MSPS PulSAR® analog to digital converter; ADR433 5.0 V ultra low noise reference. These products represent the most widely used product line in medical imaging and ultrasound today. Samples of the AD9272 and AD9273 are available now, all in a 100-pin TQFP package. The AD9272 is priced at $54 per unit in 1,000-piece quantities and $51 per unit in the AD9273.
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