Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD977x family
Edited by the Electronicstalk Editorial
Team on 29 October 2001
DACs enable direct RF upconversion
The AD977x family of dual interpolating TxDAC+ convertors from Analog Devices allows simpler direct RF up conversion architectures that require fewer external components.
The AD977x family of dual interpolating TxDAC+ convertors from Analog Devices allows simpler direct RF up conversion architectures that require fewer external components This offers basestation and broadband system designers a more cost-effective solution for multicarrier 3G transmitters, HDTV transmitters and satellite systems The AD9777, AD9775 and AD9773 offer 16, 14 and 12bit resolution, respectively, support an input datarate up to 160Msample/s with 1x interpolation, and support a maximum DAC update rate of 400Msample/s with 8x interpolation
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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The complex (I and Q) mixer rejects single sideband images, reducing the number of filtering stages, and therefore the cost of the hardware required to achieve 3G and broadband spectral emission specifications.
The AD9777/75/73 are best-in-class, high-speed transmit-path DACs, providing selectable 2x/4x/8x interpolation filters.
Thus, they improve noise performance, reduce input data rate requirements, and simplify reconstruction filtering - improving the overall quality of the transmitter design.
The AD9777 provides the best available dynamic performance, featuring W-CDMA (wideband code division multiple access) ACPR (adjacent channel power ratio) of -71dBc 71MHz IF and IMD (intermodulation distortion) of -80dBc up to 30MHz.
The AD9777 can be coupled with the AD8345 RF/IF quadrature modulator.
When the pair are used for upconverting a W-CDMA carrier to 800MHz, for example, the AD9777 can achieve greater than 40dB of image rejection with LO (local oscillator) feedthrough of less than -80dBm.
The AD9775 and AD9773 DACs are pin-compatible, providing system designers with increased flexibility and cost effectiveness in systems where lower resolutions are adequate.
The AD977x family provides the optimal solution for analogue quadrature modulation architectures in 3G multicarrier basestations, multilevel QAM modulators and instrumentation applications.
The AD9777/75/73 family is packaged in a thermally enhanced 80-lead TQFP and is priced at $39.95/35.00/24.95 per unit in 1000-piece quantities, respectively.
Samples are now available.
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