Op-amp architecture claims better balance of trade-offs

Norwood, Mass. – Analog Devices Inc. today ushered in a new era for high-speed operational amplifiers with the introduction of an IC that minimizes two fundamental error sources in amplifier design: voltage noise and harmonic distortion. The AD8099 features a patent-pending advanced circuit architecture that addresses fundamental performance trade-offs inherent in traditional differential input stages. That enables the AD8099 to deliver both extremely low voltage noise (0.95 nV/the square root of Hz) and very low distortion (-90 dB at 10 MHz), a breakthrough combination of specifications that no other high-speed op amp on the market can deliver.

In addition, the device provides a 1,400-V/microsecond slew rate and a 5-GHz gain bandwidth product at gain of 10. The AD8099 can slew at rates of 600 V/microseconds down to a gain of 2.

“Not only do few op amps have the superior noise and distortion performance of this new op amp, but none have this combination at the low gains most often used to drive high-resolution A/D converters in data acquisition systems,” said Lew Counts, ADI fellow and vice president of linear products.

The AD8099 uses an advanced pinout to enhance performance and stability over traditional amplifier pinouts. The AD8099 is the first operational amplifier to use this pinout to reduce the mutual inductance-and resulting distortion products-caused by the coupling between positive input and negative supply. Additionally, the amplifier provides two output pins to reduce feedback parasitics. That simplifies board layout and increases the stability of the amplifier.

The AD8099 is available in a lead frame chip-scale package (LFCSP). This tiny package reduces lead inductance, provides better thermal characteristics and saves board space.

The AD8099 is ideal for use in applications that require the highest degree of accuracy, such as radar collision avoidance systems, medical ultrasound signal processing and precision instrumentation. The AD8099 performs well with Analog Devices' precision analog-to-digital converters, including the PulSAR family of successive-approximation data converters.

General-purpose apps

“While the high-performance characteristics of the AD8099 are ideal for precision applications, the amplifier's overall ac and dc performance make it well-suited for a broad array of general-purpose applications, such as automatic test equipment, instrumentation and data acquisition systems,” said Counts.

The AD8099 is sampling now and will be in full production in November. The part is rated to work over an extended industrial temperature range of -40 degrees C to 125 degrees C. It is available in two packaging options: a 3 x 3-mm LFCSP, which reduces board space requirements and improves thermal characteristics, and the traditional low- profile eight-lead small-outline IC package. The parts are priced at $1.98 per unit in 1,000-piece quantities.

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