ADCs upgrade conversion performance
Analog Devices is making new levels of precision data conversion performance available with the introduction of three analogue-to-digital convertors.
Analog Devices is making new levels of precision data conversion performance available with the introduction of three analogue-to-digital convertors (ADCs) The new ADCs are designed for industrial, medical, and instrumentation applications that need the speed, accuracy, low-power, integration and small size critical to system design and performance
Designers of precision applications, such as medical imaging devices, data acquisition systems, and vibration analysis equipment, need high performance data conversion devices for successful end products that measure, sense, and process signals with utmost accuracy.
ADI's new ADCs deliver significantly better performance in terms of speed, accuracy, power, and size when compared with other currently available convertors.
The AD7982 has the best combination of accuracy and power consumption of any available 18bit ADC, with an industry-best 1Msample/s sample rate and only 7.5mW of power dissipation.
The new convertor delivers an effective resolution of 22.7bit with an output datarate of 1Ksample/s.
The AD7356 SAR (successive-approximation register) ADC features two 5Msample/s cores and is 25% faster than competing single-channel 12bit SAR ADCs.
The AD7356 is more than three times the speed of other simultaneous sampling SAR convertors in its class.
The AD7766 features a 125Ksample/s sampling rate at 15mW, providing a 20% improvement in speed over competitive devices, while consuming approximately 85% less power.
The AD7982 ADC consumes just 7.5mW, which is 95% less power than the closest competing 18bit ADC in its class.
The AD7982 also has a significant size advantage, shipping in a 10-pin QFN (quad flat no-lead) package, which is 80% smaller than any other 18bit ADC capable of a 1Msample/s clock rate.
The AD7982 is aimed at industrial and medical equipment such as CT scanners, which, for the first time, allow physicians to capture images of vital organs in a single scan.
Older CT scanners rely on less accurate ADCs with higher power consumption, limiting the effective size, or width, of the scanner.
In the case of a human heart, the multiple scans needed to render a complete image occur at slightly different points in time, requiring an additional EKG (electrocardiogram) monitor and phase-shifting technology to accurately depict the heart in motion.
The size, power and precision advantages of the AD7982 not only improve image quality and medical diagnostic results, but eliminate the need for a second piece of equipment during a CT scanning procedure.
The AD7982 18bit 1Msample/s PulSAR ADC is sampling now in 10-lead QFN and MSOP (mini small-outline package) packages, with production quantities available in the first quarter of 2007.
The AD7982 is priced at US $23.00 in 1000-unit quantities.
The AD7356 consumes just 35mW of power when operating at 5Msample/s.
The new device allows users to simultaneously sample two ADC cores to provide a 12bit result just 167ns after the sampling instant (or return conversion samples every 200ns).
This means a result can be obtained with every conversion cycle, whereas competing devices have a one-cycle latency that hampers their ability to deliver real-time results to the system processor.
The AD7356's dual-core architecture and internal reference allow designers to more tightly integrate their board configurations and save valuable board space.
The low latency and power consumption of the AD7356, combined with higher data throughput, provide a key performance advantage for optical encoders used in high-speed industrial motor controls, where constant measurement of motor functions is needed to maintain precise system operation.
The AD7356 also is suited for wide-bandwidth applications, such as adaptive cruise control, an emerging safety feature in automotive platforms that requires rapid and continuous signal conversion to measure vehicle speed and velocity.
The new SAR ADC is additionally designed for applications like RFID (radio frequency identification) transceivers, which increasingly are replacing bar code scanners in high-throughput scanning operations that demand accurate, high-speed measurement.
The AD7356 SAR ADC is sampling now in a 16-lead TSSOP (thin-shrink small outline package) with production quantities available in July 2007.
The AD7356 is priced at US $7.89 in 1000-unit quantities.
The 24bit AD7766 has a dynamic range of 108dB at 125kHz, 3dB better than competing devices at the same output datarate.
Additionally, the AD7766 has a 1.8uV/C offset drift, reducing the need to recalibrate the device due to temperature fluctuations.
The AD7766 is designed for low-power equipment where small or faint signals must be distinguished in the presence of larger signals, including applications like echolocation, data acquisition and industrial vibration analysis.
In sonar equipment, for example, the ADC's best-in-class signal-to-noise ratio (SNR), which is as high as 114dB at a 31.25kHz output datarate, allows technicians to identify underwater features at greater distances than was previously possible.
In industrial applications such as vibration analysis, the AD7766 can help reduce machinery repair costs and lost production time.
A faulty bearing or rotor, for example, will cause tiny changes in the machine's acoustical profile that can be measured using the new ADC's ability to pick small ac signals out of larger background signals.
This allows equipment operators to detect imminent failures in mission-critical systems and schedule maintenance before the failure occurs, lowering operating costs and improving overall equipment reliability.
The AD7766 ADC is sampling now in a 16-lead TSSOP with production quantities available in the third quarter of 2007.
The AD7766 is priced at US $5.95 in 1000-unit quantities.
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