To achieve a 1ppm DAC analog system design, there are often complex engineering challenges.
The current practice is to integrate multiple lower resolution DACs and a large number of discrete devices with the supporting ICs, which is followed by considerable development risk and costly modification time.
As a result, ADI introduced the first 20-bit DAC device with true 1ppm (parts per million) resolution and accuracy, the AD5791, which is four times faster and more accurate than comparable converters. With 1ppm resolution and accuracy, low noise (below 1ppm), fast refresh rate (1us), and very low output drift (below 1ppm), the AD5791 greatly simplifies design tasks, reduces development costs, and reduces risk.
In MRI (magnetic resonance imaging) systems, this breakthrough technology not only improves image quality, but also allows precise control of magnetic intensity gradients in high field strength applications for ultra-high image resolution and contrast. The low noise, low drift and high linearity of the AD5791 eliminates the frequent offline of the MRI system due to the system calibration cycle, effectively extending the working time of the MRI system. The new converter also reduces the need for complex calibration algorithms, thereby reducing engineering and system maintenance costs. In addition to the MRI system, other applications for the AD5791 include test and measurement systems, high-end scientific and aerospace instruments, communications equipment, and industrial control systems.
Enhanced data conversion performance can help imaging system designers improve image clarity and speed up the diagnosis of early disease by doctors for timely treatment. The AD5791 DAC provides exceptionally low noise performance and reduces image artifacts, thus reducing the need for multiple MRI scans. In addition, lower image error rates and higher reliability ensure efficient treatment of more patients in less time.
More than 60 million MRI exams are completed each year worldwide. MRI is a non-invasive technique that does not require the use of ionizing radiation to obtain images of the human body, so it is ideal for diagnosing various injuries and symptoms, and MRI can properly adjust the examination to meet specific imaging parameters (such as observation area). Requirements.
“For system architects, the 1ppm performance level makes a single-chip DAC architecture possible, effectively reducing design size and cost. This means that designers have the opportunity to release most of the system error budget for the first time. resources can be used in other subsystems key device, or to improve the overall MRI performance, "Patrick O'Doherty, vice president of ADI health department said.
The 20-bit AD5791 provides a relative accuracy of ±1 LSB maximum and guarantees monotonic output at up to ±1 LSB DNL. The AD5791 has low frequency noise of 0.025 ppm and output drift of 0.05 ppm/C. The output range can be configured as standard unipolar (+5V, +10V) or bipolar (±5V, ±10V) voltages. The AD5791 uses a versatile three-wire serial interface that operates at clock rates up to 50MHz.
Compared to the nearest competitor on the market
The AD5791 DAC is the latest example of ADI's cutting-edge technology for medical imaging systems. Other medical devices recently released by ADI include the ADAS1128 24-bit current-to-digital converter, the ADuM4160 single-chip USB isolator (Universal Serial Bus Isolator), and the AD927x family of 8-channel receive front-ends for ultrasound systems.
Devices used with the AD5791 include: AD8276 and ADA4004-x series operational amplifiers, ADP3331 regulators, ADP1864DC/DC buck controllers, and ADP121 linear regulators.
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