Low power consuming D/A converter
25 February 2011
This D/A converter synthesises entire cable spectrum into a single RF port.
Analog Devices has released a 14-bit D/A converter that enables cable television and broadband operators to synthesise the entire cable spectrum up to 1 GHz into a single RF port, while consuming a maximum of 1.1 W of power.
The AD9739A 14-bit, 2.5-GSPS D/A converter’s wide bandwidth and dynamic range enables cable operators to increase the QAM (quadrature amplitude modulation) channel densities by 20 times over the densities found in modern cable modems.
Competing D/A converter solutions require an additional 28 LVDS (low-voltage differential signalling) pairs for the data interface and consume nearly three times more power than ADI’s AD9739A D/A converter.
“The AD9739A converter allows cable head-end equipment manufacturers to simplify and reduce their signal chain footprint while enabling operators to continue providing their customers with improved next-generation services, such as interactive TV, high-definition broadcasts and new speciality channels,” said Chris Jacobs, Product Line Director, High-speed D/A Converter group, Analog Devices. “Synthesising the entire cable spectrum into a single RF port increases the number of QAM channels per D/A converter by up to 20 times to meet cable infrastructure demands while significantly lowering power consumption and system cost.”
The AD9739A D/A converter features ADI’s proprietary mix-mode function, which supports the high-fidelity digital synthesis of RF signals at up to 3.6 GHz. The combination of best-in-class, 2.5-GSPS bandwidth and 14 bit dynamic range with a direct-to-RF core allows broadband and next-generation wireless equipment designers to use a single-transmit D/A converter architecture that eliminates a low-pass filter and one mixer or modulator stage.
It is suitable for a range of applications, including wireless-communications equipment, instrumentation and defence electronics. The device provides multi-carrier capability up to the Nyquist frequency in baseband mode and uses ADI’s mix-mode function to generate RF signals in the second and third Nyquist zones.
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