Analog introduces 16-V, zero-drift instrumentation amplifier

Norwood, MA—To enable low-drift and precision over extended temperature ranges in industrial applications, Analog Devices Inc. has introduced what it reports is the industry's first 16-V, zero-drift precision instrumentation amplifier (in-amp).

02/01/2005


Norwood, MA— To enable low-drift and precision over extended temperature ranges in industrial applications, Analog Devices Inc. has introduced what it reports is the industry's first 16-V, zero-drift precision instrumentation amplifier (in-amp). Designed for optimal performance in noisy industrial environments, The firm adds that AD8230 features the industry's highest common mode input range, maintains low drift, and delivers precise measurements over an extended temperature range.

Until now, industrial process control design engineers reportedly could only achieve this level of performance by adding resistors around discrete zero-drift operational amplifiers, making them costly and difficult to implement. Analog reports that AD8230 is the industry's first zero-drift in-amp to operate at 16 volts, giving industrial system designers 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 16-V discrete solutions are not zero-drift and have common mode reject ratio (CMRR) limitations due to resistor matching and tolerance challenges,' says Jay Cormier, product line director of Analog's Advanced Linear Products division. 'With the AD8230, designers can achieve a 25% reduction in cost and a 50% reduction in board area over most discrete solutions.'

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

Also, 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. AD8230 operates on

Control Engineering Daily News Desk
Jim Montague, news editor
jmontague@reedbusiness.com





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