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February 14, 2012

Analog Devices Inc. Unveils New 11-Bit 2.5-GSPS D/A Converter

Analog Devices (News - Alert), Inc. (ADI), a Norwood, Massachusetts-based provider of data-conversion and signal-conditioning technology solutions, has rolled out a new 11-bit digital-to-analog (D/A) converter – AD9737A 2.5-GSPS, which reduces the cable head-end signal chain footprint by allowing cable television and broadband operators to synthesize the entire cable spectrum up to 1 GHz into a single RF port.

The new AD9737A is a 11-bit high performance RF DAC featuring a dual-port, double data rate, source synchronous LVDS interface that support maximum conversion rate of 2500 MSPS/ 2.5 GSPS. Capable of synthesizing high quality wideband signals with bandwidths of up to 1.25 GHz in the first or second Nyquist zone, it consumes a maximum of 1.1 W of power.

According to ADI, the AD9737A D/A converter features low noise and inter-modulation distortion that allow for high quality synthesis of wideband signals up to 1 GHz, thereby reducing the number of transmit DACs required in the typical cable plant.

Featuring proprietary quad-switch DAC architecture, the new AD9737A is a11-bit high performance RF DAC that provides exceptional ac linearity performance while enabling mix-mode operation.

Manufactured on a 0.18 μm CMOS process, the AD9737A features wide bandwidth and dynamic range that facilitate cable infrastructure designers to increase QAM (quadrature amplitude modulation) channel density by 20 times over present cable modem implementations. This feature allows for the development of improved next-generation services such as interactive television, high-definition broadcasts and new specialty channels.

Featuring programmable differential current output from 8.7 mA to 31.7 mA range, the new DAC operates from 1.8 V and 3.3 V supplies. They are supplied in a 160-ball chip scale ball grid array for reduced package parasitics. The programmable output current adds flexibility in interface options.

Simplifying the digital interface with existing FGPA/ASIC technology, the new DAC includes on-chip controllers that simplify system integration. On-chip controllers are used to manage external and internal clock domain variations over temperature to ensure reliable data transfer from the host to the DAC core.

Available for $37.14 USD for 1,000 quantities, the new DAC eliminates synchronization circuitry; and is pin compatible with the AD9739.

Some of the ideal applications of AD9737A include broadband communications systems, DOCSIS CMTS systems, military jammers, instrumentation, automatic test equipment, radar, avionics, and more.

ADI's ADCLK914 clock/data buffer is provided as complimentary along with AD9737A D/A converter. The ADCLK914 drives the clock input of the AD9737A D/A converter with a 2 V differential swing that achieves jitter performance of 110 fs.

Recently, ADI had rolled out a new 6.5-V, 4-A output DC-to-DC regulator - ADP2164 - featuring a high conversion efficiency of greater than 96 percent. This regulator offers an input voltage supply range of 2.7 V to 6.5 V, an output range as low as 0.6 V and includes low on-resistance switching FETs to maximize efficiency while reducing board space.

Jayashree Adkoli is a contributing editor for TMCnet. To read more of Jayashree's articles, please visit her columnist page.

Edited by Jennifer Russell

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