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Differential Amplifier Drives High-Speed ADCs in Sensitive Communications, Medical and Radar Applications : High-speed amp achieves SFDR more than 6 dB better than competing devices and maintains performance over an input bandwidth range of dc to more than 100 MHz.





NORWOOD, Mass. (PRWEB) September 30, 2008

The AD4927 can be used in single-ended-to-differential and differential-to-differential configurations and is optimized for driving today’s high-performance 14- and 16-bit converters, including ADI’s AD9460 and AD9461 two-channel, 16-bit ADCs and AD9246 low-power, 14-bit ADC. The ADA4927 is especially well suited to wireless communications applications as well as medical equipment and defense electronics that use low IF (intermediate frequency) and baseband signal processing at frequencies up to 100 MHz, and where 14- and 16-bit accuracy is required. The two-channel version, the ADA4927-2, is ideal for driving dual ADCs used in I/Q demodulation schemes and offers low cross-talk of 80 dB at 100 MHz while providing gain and phase matching.




The internal common-mode feedback loop of the AD4927 allows the user to independently adjust the output common-mode level to match the input common-mode voltage of the ADC, while achieving exceptional output balance and suppression of even-order harmonics.

The ADA4927 is fabricated using ADI’s proprietary silicon-germanium (SiGe) complementary bipolar process, enabling it to achieve very low levels of distortion with an input voltage noise of 2.3 nV/rt Hz, as well as 3 dB bandwidth of 1.4 GHz (G=+2) and a slew rate of 5000 V/

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