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.

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Analog Devices, Inc. (ADI), the world’s leading supplier of data converters and high-speed amplifiers, today introduced a high-speed differential amplifier that delivers the industry’s best combination of high performance, low noise and reduced power consumption for engineers driving high-gain ADCs (analog-to-digital converters) in power-sensitive communications and instrumentation systems. Drawing less than half the current of other devices in its class, ADI’s ADA4927 differential amplifier achieves greater than 80 dB SFDR (spurious-free dynamic range) at G=10 (gain=10), more than 6 dB better than competing ADC drivers. Even at such high gain, the current feedback architecture of the AD4927 allows it to maintain performance over an input bandwidth range of dc to more than 100 MHz, while the performance of other ADC drivers quickly degrades at frequencies beyond 70 MHz.

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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/µS. Consuming less than 120 mW from a single 3.3-V supply, the ADA4939 is specified to operate over the −40 degrees C to +105 degrees C temperature range for both 3.3-V and 5-V operation.

Availability and Pricing

The ADA4927-1 and ADA4927-2 are available now in production quantities. The ADA4927-1 is housed in a Pb-free, 3 mm × 3 mm 16-lead LFCSP (lead-frame chip-scale package), and the two-channel ADA4297-2 comes in a 4 mm × 4 mm 24-lead LFCSP. The ADA4927-1 is priced at $3.79 per unit in 1,000-unit quantities, and the ADA4927-2 is priced at $5.69 per unit in 1,000-unit quantities. For more information, visit http://www.analog.com/pr/ADA4927. For more information on driving ADCs, visit http://www.analog.com/adcdrivers.

About Analog Devices

Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Celebrating over 40 years as a leading global manufacturer of high-performance integrated circuits used in analog and digital signal processing applications, Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices' common stock is listed on the New York Stock Exchange under the ticker "ADI" and is included in the S&P 500 Index. http://www.analog.com.

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