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Low-noise precision amp targets low-voltage apps

Norwood, Mass. — Analog Devices Inc. is kicking off a new family of precision amps that are optimized for the low-noise requirements of instrumentation, audio, communications and medical applications operating at 5 V and less.

Prior to this device, applications requiring low-noise performance had to use higher-priced bipolar amplifiers designed for higher-voltage applications or add discrete components that require more board space and increase system costs, said Steve Sockolov, ADI's product line director for precision amplifiers. The AD8655 is the industry's lowest noise precision amplifier designed for +2.7 V to +5 V operation, delivering up to two-thirds lower noise than competing solutions, at a price point significantly below that of bipolar solutions, he said.

The amplifier delivers 2.7 nV per √ Hz at 10 kHz, and low distortion at 0.0008 percent, eliminating the need for external transistor stages or multiple parallel amplifiers to lower system level noise, and also improving the signal-to-noise ratio and resolution.

The low offset of 250 μV maximum over the full common-mode voltage range provides high DC accuracy without system trimming. The rail-to-rail input and output of the amplifier makes it practical for driving analog-to-digital converters (A/D converters) and buffering digital-to-analog converters (D/A converters) in high accuracy systems.

This amplifier is the first device in an upcoming family of precision amplifiers that utilize ADI's DigiTrim technology — which offers the low-voltage advantages of CMOS, while overcoming the electrical performance limitations of the technology. The company plans to release dual and quad version precision amplifiers this year.

The amplifier also features a bandwidth of 28 MHz and offset voltage drift of 0.4 μV/°C typical and 2.3 μV/°C maximum.


The AD8655 low-noise amplifier is available now in 8-lead MSOP and
SOIC packaging and is priced at 70 cents per unit in 1,000-piece quantities.Click here for the AD8655 data sheet.

Analog Devices , 1-800-262-5643, www.analog.com.

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