ADI’s new A/D data converters set speed, accuracy marks

Analog Devices Inc. (ADI) just announced two new data converters that reportedly deliver industry-best speeds and high accuracy at high-bit resolutions.


Typical applications for AD7641 SAR converter (left) include high-speed data acquisition (PC-based systems, SCADA, and DSP interfaces), while AD7760 is suited to vibration analysis, automated test equipment, and medical imaging.

Analog Devices Inc . (ADI) just announced two new data converters that reportedly deliver industry-best speeds and high accuracy at high-bit resolutions. By eliminating the need for complex front-end signal conditioning, these analog-to-digital converters (ADCs) simplify circuit design and decrease system cost, according to ADI. The new converters are: AD7641 , an 18-bit successive-approximation register (SAR) ADC, and AD7760 , a high-speed 20-bit sigma-delta ADC.

"The two converter architectures represent breakthroughs in their own right," James Caffrey, ADI’s product marketing manager for precision converters, told Control Engineering. "They allow users to maintain signal integrity with less processing and promote a design with fewer components."

AD7641 SAR converter operates at a sampling rate of 2 MSPS—four times faster than the closest competition, while improving accuracy by a factor of three, says ADI. Typical nonlinearity is 2 LSB (least significant bit) and SNR (signal-to-noise ratio) is 93 dB. Its wider dynamic range eliminates the need for a programmable gain amplifier in many applications. AD7641’s low power consumption (100 mW at 2 MSPS) translates into reduced system cost. Customers can further reduce power dissipation by operating the ADC in "impulse mode," where power dissipation decreases with throughput. Users can select from fastest throughput to lowest power consumption.

AD7760 sigma-delta converter is said to deliver the industry’s highest SNR of 100 dB at 2.5 MSPS update rate. It also simplifies complex anti-aliasing filtering, which reduces design effort, cost, and time to market. An on-chip buffer and differential amplifier further reduce the need for external components. Caffrey adds that sigma-delta converters, good at digitizing low-value signals, have been slow performers in the past, and therefore were traditionally used for relatively slow signals. "Today, AD7760 sigma-delta pushes the speed boundary."

Both converters are sampling now with full production expected in October 2004 for AD7641 and February 2005 for AD7760. Pricing in 1,000-piece quantities is $32.95 each for AD7641, available in either a 48-lead LFCSP (lead frame, chip-scale package) or LQFP (low-profile quad flat pack) and $34.95 each for AD7760, which comes in 64-lead TQFP (thin-quad flat pack) or 48-lead LFCSP.

—Frank J. Bartos, executive editor, Control Engineering,

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Make Big Data and Industrial Internet of Things work for you, 2017 Engineers' Choice Finalists, Avoid control design pitfalls, Managing IIoT processes
Engineering Leaders Under 40; System integration improving packaging operation; Process sensing; PID velocity; Cybersecurity and functional safety
Mobile HMI; PID tuning tips; Mechatronics; Intelligent project management; Cybersecurity in Russia; Engineering education; Road to IANA
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
click me