Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD9779
Edited by the Electronicstalk Editorial
Team on 13 January 2005
16bit DAC speeds to 1Gsample/s
Analog Devices reckons it has produced the industry's first 16bit digital-to-analogue convertor (DAC) to achieve a sample rate of 1Gsample/s, making it twice as fast as competing solutions.
Analog Devices reckons it has produced the industry's first 16bit digital-to-analogue convertor (DAC) to achieve a sample rate of 1Gsample/s, making it twice as fast as competing solutions Importantly, at these industry-leading speeds, the AD9779 maintains ADI's trademark signal processing performance offering best-in-class dynamic range, noise and distortion, while consuming up to 36% less power than competing solutions
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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The highly integrated interpolating dual AD9779 is designed to enable high quality conversion of the most demanding wireless standards, such as W-CDMA, cdma2000, TD-SCDMA and WiMAX.
"The requirements of multichannel wireless communications applications and digital predistortion architectures are driving the need for more optimised data convertors that can synthesise high-quality signals at much higher frequencies", said Dave Robertson, Product Line Director, High-Speed Convertors, at Analog Devices.
"With the AD9779, Analog Devices is delivering a dual 16bit DAC that offers wireless systems designers the best combination of signal processing performance, low-noise and low-power consumption for wideband signal synthesis".
Further reading
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The ADF9010 integrates a high-performance transmitter quadrature modulator with an integer-N synthesiser and on-chip low-phase-noise voltage-controlled oscillator.
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Combined two-chip solution can reduce the active component count by 60% within a radio design, providing considerable board area and bill of material savings.
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With on-chip 24bit sigma-delta ADCs, the ADuC706x provides the resolution required by today's high-performance industrial and instrumentation equipment.
"This combination allows communications infrastructure manufacturers to design one transceiver platform for the global deployment of multiple wireless standards".
In addition to the AD9779, Analog Devices is introducing the AD9778 and AD9776 dual interpolating DACs, forming a family of 16, 14 and 12bit pin-compatible devices that allow designers to easily trade off performance for system cost.
These devices are the newest members of Analog Devices' industry-leading TxDAC+ portfolio of digital to analogue convertors specifically optimised for the transmit signal path of communication systems.
In comparison with competing products, the the 16bit AD9779 dual DAC offers 4dB lower noise, 15dB better intermodulation distortion (IMD) and 20dB higher spurious free dynamic range (SFDR) at a 70MHz output frequency, while consuming 600mW of power at 500Msample/s and 1W at 1Gsample/s.
The device contains on-chip digital interpolation filters, a complex digital modulator and a digital mixer.
These features simplify the digital interface and allow some digital signal processing functions to be moved out of the FPGA or ASIC.
Another benefit of the on-chip filtering is relaxation of the analogue reconstruction filters, which eases performance requirements to reduce board space and total system cost while improving manufacturability.
As a dual DAC, gain and offset matching in the AD9779 is guaranteed, making the device appropriate for direct conversion or image reject architectures using an analogue quadrature modulator.
Integrated gain and offset calibration DACs enable communications equipment designers to optimise sideband rejection and local oscillator (LO) feedthrough in these architectures.
A multi-DAC synchronisation scheme simplifies clocking requirements in systems with multiple convertors, allowing easier control of phase coherency.
Device configuration is achieved through an easy-to-use serial peripheral interface (SPI) with an interface common to other TxDAC+ devices.
For optimised transmit signal chain performance, the analogue output of the AD9779 TxDAC+ convertor seamlessly interfaces to Analog Devices' analogue quadrature modulators, like the AD8349.
A standard parallel interface enables straightforward connection to the AD6633 multichannel wideband up convertor with the VersaCrest crest reduction engine.
The AD9779 can be driven by ADI's AD9510 high-performance clock distribution IC as part of a complete clock distribution system.
ADI's latest 14bit, 80Msample/s analogue-to-digital convertor (ADC), the AD9444, is designed to interface to the AD6636 four- or six-channel digital downconvertor to form the core of a wideband communications receiver.
Together, these devices form the basis for a high-performance digital radio transceiver.
The AD9779, AD9778 and AD9776 TxDAC+ convertors are sampling now and will be available in production quantities in May 2005 in a Pb-free 100-lead TQFP-EP (thin quad flat pack - exposed paddle) package.
The AD9779 is priced at $27.95 in 1000-unit quantities, and the AD9778 and AD9776 are priced at $24.95 and $19.95, respectively, also in 1000-unit quantities.
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