Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD9958 and AD9959
Edited by the Electronicstalk Editorial
Team on 25 July 2005
Multichannel DDS chips offer flexible
clocking
The industry's first multichannel DDS devices provide solutions to two common design challenges faced by system engineers in a range of applications.
Analog Devices has released the industry's first multichannel DDS (direct digital synthesis) devices, providing a solution to two common design challenges faced by system engineers in a range of applications Allowing independent programming of up to four inherently synchronised outputs, ADI's new four-channel AD9959 and two-channel AD9958 deliver greater control to correct imbalances between multiple signals, enabling engineers to spend considerably less time and effort on this usually complex portion of the system design
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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For space-constrained systems, the AD9958 and AD9959 simplify the design process by integrating multiple DDS channels on a single chip, eliminating the need for several single-channel DDS chips and external circuitry and offering dramatic board space reduction of up to 75% over traditional solutions.
Direct digital synthesis is a digital technique used for generating an analogue output waveform or clocking signal from a fixed-frequency clock source.
The AD9959 and AD9958 are optimised for applications that require complex high speed synthesis up to 200MHz, including phased-array radar/sonar systems, automatic test equipment, medical imaging and optical communications systems.
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"Analog Devices is meeting the synthesiser synchronisation challenge by leveraging its world-class convertor technologies to develop highly integrated DDS devices that lower the cost and complexity of system design", said Kevin Kattmann, Product Line Director, High Speed Convertor Group, Analog Devices.
"The ability to easily achieve precision phase offset control between multiple synchronised output channels, while consuming minimal board space, enables the AD9959 and AD9958 to offer system designers significant advantages over traditional frequency synthesiser solutions and single-channel DDS products".
Used in a wide range of applications from test and measurement equipment to wireless and satellite communications, ADI's complete DDS solutions employ an on-chip high-performance DAC (digital-to-analogue convertor) to convert a reference frequency to a sampled sinewave with extremely fine frequency control.
DDS devices are increasingly becoming an attractive alternative to traditional frequency-agile analogue synthesiser solutions as they offer considerable performance benefits, such as unparalleled matching of outputs, easier synchronisation for obtaining quadrature and other signal phase relationships, and extremely fast frequency transition.
Digital control eliminates the need for manual system tweaking and allows output frequencies to be conveniently derived.
In order to alleviate the design complexities typically involved in the synchronisation of multiple DDS devices, the independent channels of the AD9959 and AD9958 are internally synchronised by a common reference clock.
Programmable channel control allows for correction of imbalances in external signal paths due to analogue processing, such as filtering, amplification, or PCB layout mismatches.
If additional channels are required, the AD9959 and AD9958 allow daisychaining of additional DDS chips.
The devices also offer extremely low power consumption of less than 165mW per channel.
Each channel of the four-channel AD9959 and the two-channel AD9958 incorporates a high speed 10bit DAC with excellent wideband and narrowband SFDR (spurious free dynamic range).
Each fully independent programmable channel provides 14bit of phase offset tuning, 32bit frequency resolution and 10bit amplitude control.
The device also supports direct or linear sweep modulation, while achieving channel isolation of greater than 60dB.
The integrated 32bit frequency tuning word enables each channel to be programmed to resolutions of 116MHz or less with a sampling clock of up to 500Msample/s.
The AD9959 is available in production quantities now; the AD9958 is sampling now with product quantities available in September, 2005.
Both devices are specified over the extended industrial temperature range of -40 to +85C.
The four-channel AD9959 and the two-channel AD9958 are respectively priced at $37.14 and $20.24 per unit in 1000-piece quantities and are each packaged in an 8 x 8mm LFCSP (lead frame chip scale package).
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