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Voltage-feedback amp touts lowest power

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 per cent 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 minimises 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 3-by-3mm 8-lead LFCSP and 8-lead SOIC packages. The dual ADA4857-2 is available in a 4-by-4mm 16-lead LFCSP. The single-channel ADA4857-1 is priced at Rs.33.56 (85 cents) per unit, and the dual ADA4857-2 is priced at Rs.54.87 ($1.39) per unit, both in 1,000-unit quantities.

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