Analog Devices Press Release - 3/16/2009
Analog Devices 14-Bit Converter Performs Direct Digital Synthesis
ADI’s DAC architecture streamlines wideband communications design
allowing wireless and broadband equipment to support multiple standards
using a single direct-to-RF transmit core.
for RF Signals to 3.6 GHz
16, 2009, NORWOOD, Mass.--(BUSINESS
WIRE)-- Analog Devices, Inc. (NYSE:
ADI), the global
leader in data-conversion technology, today introduced a pair of 14-bit
converters) that perform direct digital synthesis for signals up
to 3.6 GHz. These high-performance converters extend ADI’s industry-leading
TxDAC® family of transmit digital-to-analog converters by delivering
an unmatched combination of usable bandwidth and effective dynamic range
to communications-equipment manufacturers worldwide.
AD9739 TxDACs feature ADI’s proprietary Mix-Mode™ super-Nyquist
architecture, which supports high-fidelity digital synthesis of RF (radio
frequency) signals up to 3.6 GHz. The combination of best-in-class bandwidth
and dynamic range with a direct-to-RF core allows broadband and next-generation-wireless
equipment designers to use a single transmit-DAC architecture for multiple
communications standards while eliminating an off-chip mixer and low-pass
filter to reduce design complexity, cost, size, and power. The mix-mode
capability was introduced two years ago with the release of ADI’s AD974x
and AD978x TxDAC product series.
“Given the demands that carriers
are placing on broadband-communication systems, the ability to maximize
usable bandwidth and dynamic range creates a clear advantage,” said
Dave Robertson, product line director for high-speed signal-processing,
Analog Devices. “Whether the system in question is today’s latest cable-infrastructure
equipment or tomorrow’s advanced digital-radio design, high-performance
data conversion is the key to unlocking the advantages of a true direct-to-RF
Multi-Standard Support for Cable
and Wireless Infrastructure
AD9789 14-bit TxDAC integrates a QAM encoder, interpolator, and
digital up-converter that achieve a 2.4-GHz sample rate for cable infrastructure.
AD9739 exploits the same DAC core, features the industry’s widest
useable input bandwidth, and is well suited for a broad range of applications
including wireless-communications equipment, instrumentation, and defense
electronics. Both devices provide multi-carrier capability up to the
Nyquist frequency in baseband mode and use the mix-mode function to
generate RF signals in the second and third Nyquist zones. This feature
allows designers to eliminate a mixing stage, reducing component count
and design complexity in direct-RF applications.
AD9789 TxDAC shortens time-to-market for DOCSIS-III cable-infrastructure
designs using low-cost FPGAs. The DAC includes a flexible digital interface
that can accept up to four channels of complex data. The QAM encoder
supports constellation sizes of 16, 32, 64, 128, and 256 with SRRC (square-root
raised cosine) filter coefficients for all standards. The on-chip rate
converter supports a wide range of baud rates with a fixed DAC clock.
The digital up-converter can place the channels from 0 to 0.5 fDAC,
to synthesize up to four contiguous DOCSIS channels anywhere in the
DOCSIS band. The AD9789 also includes an SPI (serial peripheral interface)
port for device configuration and status-register readback. The flexible
digital interface accommodates data bus widths from 4 bits to 32 bits
and can accept either real or complex data. Configuration options can
set the data path to bypass the QAM encoder and SRRC filter to enable
the DAC to operate within a broader range of applications such as wireless
infrastructure. The nominal DAC output current is 20 mA, which produces
a peak 0-dBm of power into a 50-ohm load. The
AD9789 operates from 1.5-V, 1.8-V, and 3.3-V supplies for a total
power consumption of 1.7 W–half of competing signal chains’ power dissipation.
With breakthrough AC performance, the
AD9739 14-bit TxDAC provides output signals to 3.6 GHz. The DAC
features a dual-port low-voltage differential signaling (LVDS) interface
to support the high sample rate with existing FGPA and ASIC signal-processing
technology. An SPI port is included for configuration and status-register
read back. The output current is programmable from 8.7 mA to 31.7 mA.
AD9739 operates from 1.8-V and 3.3-V supplies for a total maximum
power consumption of 1.1 W, which is a 25 percent reduction when compared
with conventional transmit signal chains.
Availability and Complementary Products
AD9789 14-bit TxDACs are available now in volume production. Complementary
products include ADI’s high-speed, low-jitter clock generation and distribution
products, such as the
ADCLK914 high-speed SiGe clock buffer. This product drives the clock
input to the
AD9789 DACs with a large 2-V differential swing that achieves jitter
performance of 110 fs.
Product Sampling Price
Each Per 1000 Packaging
Now $43.69 160-Ball CSBGA
Now $53.10 164-Ball CSBGA
For more information,
Data Converters: Bridging the Analog and Digital
More designers turn to Analog Devices than any
other supplier for the high-performance conversion technology required
to bridge the analog and digital worlds in today’s myriad electronic
systems. With the industry’s leading portfolio of ADCs (analog-to-digital
converters) and DACs (digital-to-analog converters), Analog Devices’
converter products feature the right combination of sampling rates,
accuracy, and reduced noise, power, price, and package size required
in industrial and instrumentation, medical equipment, automotive systems,
communications infrastructure, and consumer electronics. Online evaluation
tools help customers quickly validate, select, and design in the optimal
data converters to reduce design complexity, development schedules,
and bill-of-material costs. To view ADI’s ADC selection guide, visit
www.analog.com/ADCsearch. For ADC drivers, visit
To view ADI’s DAC selection guide, visit www.analog.com/DACsearch.
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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