ADI Announces Low-Noise, Linear-in-dB, Quad VGA Provides 24-dB Gain Range for
Communications, Medical Radiology, and Advanced Video Equipment
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 the
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.
Product Samples Availability Temperature Range Pricing Per 1,000 Packaging
AD8264 NOW March 2009 –40°C to +85°C $11.95 40-lead LFCSP
About Analog Devices, Inc.
Innovation, 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.
For more information on ADI's most recent product releases, visit our
Press Release home page.
Analog Devices, Inc.
Bob Olson, 781-937-1666