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ADI targets industrial apps with zero-drift instrumentation amp

Posted: 31 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? adi? instrumentation amplifier? in-amp? ad8230?

Analog Devices Inc. (ADI) introduced what it claims is the industry's first 16V, zero-drift precision instrumentation amplifier (in-amp).

Designed for optimal performance in noisy industrial environments, the AD8230 features the industry's highest common mode input range, maintains low drift, and delivers precise measurements over an extended temperature range, according to ADI.

Until now, industrial process control design engineers could only achieve this level of performance by adding resistors around discrete zero-drift operational amplifiers, making it costly and difficult to implement. The AD8230 is the industry's first zero-drift in-amp to operate at 16 volts, providing designers of industrial systems the benefits of an integrated, cost-effective in-amp solution for instrumentation environments such as precision temperature and bridge transducer interface applications where ground potentials vary by several volts.

"Most 16V discrete solutions are not zero-drift and have common mode reject ratio (CMRR) limitations due to resistor matching and tolerance challenges," said Jay Cormier, product line director for ADI's Advanced Linear Products. "With the AD8230, designers can achieve a 25 percent reduction in cost and a 50 percent reduction in board area over most discrete solutions."

In addition to its 16V common mode input voltage range, which is 45 percent wider than the nearest competitor's offering, the AD8230 is the only solution that maintains better than 50nV/C offset drift over the automotive and extended industrial temperature range of -40C to 125C. Competitors' in-amps have significantly higher offset drift (nearly 50 times) above 85C, ADI said. The AD8230's high CMRR of 110dB (min) rejects line noise in measurements where the sensor is far from the instrumentation or when it exhibits dc offset change over temperature.

The AD8230 is versatile yet simple to use. Two matched external resistors are required to program the gain, offering greater stability over single resistor programmed instrumentation amplifiers. The AD8230 operates on 4V to 8V dual supplies, or 8V to 16V single supplies, with input and output rail-to-rail capability.

The AD8230 is available now in 8-lead SOIC and is priced at $2.95 in 1,000-piece quantities.

- Bettyann Liotta


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