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Voltage-feedback amp draws lowest power at 5mA

Posted: 18 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:voltage-feedback amplifier? op amp? signal conditioning?


Analog Devices Inc. is offering what it claims to be lowest power voltage-feedback amplifier designed for densely populated, thermally sensitive instrumentation equipment that requires high-speed signal conditioning.

Operating at 850MHz, the ADA4857 high-speed op amp consumes 5mA, less than half the power of competing voltage-feedback amps.

The ADA4857 reduces input noise to 4.4nV/rtHz, which is 50 percent lower than competing amps. With -91dBc distortion at 10MHz, the device provides a 10dB improvement over voltage-feedback amps that dissipate twice the power. For space-constrained medical imaging, ATE and other multichannel instruments, the 5mA supply current minimizes the need for active thermal management devices and passive cooling elements, such as fans and heat sinks, thus allowing system designers to reduce development costs and design complexity.

The ADA4857 is with full volume production scheduled for April. The single-channel ADA4857-1 is available in 3mm x 3mm 8-lead LFCSP and 8-lead SOIC packages. The dual ADA4857-2 is available in a 4mm x 4mm 16-lead LFCSP. The single-channel ADA4857-1 is priced at 85 cents per unit, and the dual ADA4857-2 is priced at $1.39 per unit, both in 1,000-unit quantities.

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