Analog Devices Press Release - 2/25/2009
ADI Announces Low-Noise, Linear-in-dB, Quad VGA Provides 24-dB
Gain Range for Communications, Medical Radiology, and Advanced Video
ADI’s AD8264 quad-channel VGA with four on-chip ADC drivers
increases channel densities and resolution in PET scanners through dramatic
reduction in board space. Integrated variable gain control, closely
matched channel-to-channel performance and dc coupling also reduce propagation
delays and yield faster signal transition times in communications and
advanced video applications.
25, 2009, NORWOOD, Mass.--(EON:
Enhanced Online News)-- Analog Devices, Inc. (ADI),
the world leader in high-speed amplifiers, introduced today the
AD8264 quad-channel VGA (variable-gain amplifier)—a highly integrated
device designed for PET (positron emission tomography) scanners, communication
systems, and advanced video equipment. The AD8264 is the industry’s
leading four-channel VGA and the first to integrate four ADC (analog-to-digital
converter) drivers, enabling radiological equipment designers, for example,
to reduce printed-circuit board area and simplify layout by replacing
eight components with a single device.
Space savings is a key
design requirement for advanced systems in many applications. Next-generation
PET scanner designs are increasing channel densities to enhance image
resolution and improve patient diagnostics, despite limits to the physical
size of the scanning element, or gantry. The high-speed AD8264 VGA has
a single-ended output for wide-bandwidth applications, and auxiliary
differential ADC drivers that operate with ADI’s data converters, including
AD9222 octal and
AD9228 quad 12-bit
The AD8264 quad VGA is also suited for
wireless infrastructure equipment where its four DC-coupled channels
and precise gain control allow communication-systems designers to more
easily adjust output-signal levels and eliminate the time and cost associated
with matching four discrete VGAs. For advanced broadcast and
video-security applications, ADI’s new VGA improves picture quality
by more accurately white-balancing RGB (red-green-blue) signals and
better managing gain-trim calibration over the system’s life.
Each of the AD8264’s four linear-in-dB VGA channels has independent
gain control. Each channel comprises a high-impedance preamplifier,
a high-speed VGA, and a differential output amplifier. The AD8264’s
pinout provides single-ended output taps directly from the VGAs, which
have a -3 dB bandwidth of 235 MHz, and balanced outputs from the 80-MHz
output amplifiers. Dual supply operation enables gain control of negative-going
pulses such as those that photodiodes, photo-multiplier tubes, and video
signal-sources generate. With a 24-dB gain range, the AD8264 features
a gain-control interface that provides a precise 20 dB/V linear-in-dB
scale. A common gain-control reference for all channels simplifies wiring.
The differential gain-control structure accommodates a wide range of
common-mode operating points, simplifying the interface to any analog
or digital control source. A VOCM pin sets the common-mode voltage of
the differential output stage to match most modern single-supply ADCs,
and allows for dc level-shift of the output. Power consumption is 125-mW
per channel at ±3.3V.
Availability and Pricing
Availability Temperature Range
Pricing Per 1,000 Packaging
March 2009 –40°C to +85°C
About Analog Devices, Inc.
performance, and excellence are the cultural pillars on which Analog
Devices has built one of the longest standing, highest growth companies
within the technology sector. Acknowledged throughout the industry as
the world leader in data conversion and signal conditioning technology,
Analog Devices serves over 60,000 customers, representing virtually
all types of electronic equipment. Celebrating over 40 years as a leading
global manufacturer of high-performance integrated circuits used in
analog and digital signal processing applications, Analog Devices is
headquartered in Norwood, Massachusetts, with design and manufacturing
facilities throughout the world. Analog Devices' common stock is listed
on the New York Stock Exchange under the ticker “ADI” and is included
in the S&P 500 Index.
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Analog Devices, Inc.
Bob Olson, 781-937-1666