Analog Devices unveil the DOCSIS 3.0-Compliant RF AD9129 D/A Converter

16th October 2012
Posted By : ES Admin
Analog Devices unveil the DOCSIS 3.0-Compliant RF AD9129 D/A Converter
Analog Devices today introduced two RF D/A converters that are able to synthesise the entire downstream cable spectrum from a single D/A converter port. Supporting data rates up to 2.8 GSPS, the single-channel, 14-bit AD9129 and 11-bit AD9119 RF D/A converters allow cable operators to reduce the total system power and component count of CATV (CMTS) infrastructure equipment, simplify system design, and lower total bill of material costs.
The new RF D/A converters support from one to as many as 158 CATV carriers and include an optional 2x interpolation filter that reduces output filtering complexity by effectively increasing the D/A converter update rate by a factor of two. In its Mix-Mode™ super-Nyquist operation, the AD9129 can reconstruct spectrally-pure RF carriers in the 2nd and 3rd Nyquist zones, eliminating a mixing stage while still maintaining exceptional dynamic range at up to 4.2 GHz.



“The AD9129 RF D/A converter utilises ADI’s patented quad-switch architecture to synthesise the full DC-to-1.4 GHz baseband output spectrum, which will greatly simplify and improve downstream DOCSIS 3.0-compliant transmitter design,” said Carlton Lane, marketing manager, High-speed D/A Converter group, Analog Devices. “This D/A converter’s new level of performance and functionality enables cable infrastructure equipment manufacturers to implement the complete downstream signal chain in a smaller footprint, at one-third the power, and using fewer signal chain components. These are all important design considerations in today’s CMTS service environment.”



More About the AD9129 14-bit RF D/A Converter

The AD9129 RF D/A converter enables industry leading direct RF synthesis performance with minimal loss of output power across its output spectrum. The device also enables dual-edge clocking operation, effectively increasing the converter update rate to 5.6 GSPS when configured for Mix-Mode or 2x interpolation mode. Its high dynamic range and bandwidth enable multi-carrier generation up to 4.2 GHz. The device dissipates only 1.1 W at the full 2.8-GSPS D/A converter update rate.



The AD9129 includes a dual-port, source-synchronous LVDS (low-voltage differential signalling) interface that simplifies the data interface to a host FPGA or ASIC. On chip DLLs (delay-locked loops) optimise timing between different clock domains, while an SPI (serial peripheral interface) is used to configure the AD9129 and monitor the status of read-back registers.



AD9129/19 Single-channel D/A Converters Features and Benefits:



• D/A converter update rate of up to 5.6 GSPS

• Direct RF synthesis @ 2.8 GSPS data rate

o DC-to-1.4 GHz in baseband mode

o DC-to-1.0 GHz in 2X interpolation mode

o 1.4-to-4.2 GHz in Mix-Mode

• 1 to 158 DOCSIS 3.0 carriers: 8 QAM carrier ACLR = > 69 dBc

• By-passable 2x interpolation filters

• Single/multi-carrier IF or RF synthesis

• Low power: 1.1 W @ 2.8 GSPS (1.3 W @ 5.6 GSPS)

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