Amp sports zero drift

Analog Devices has introduced what it claims is the industry’s first 16-V, zero-drift precision instrumentation amplifier.

Designed for 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.

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 16V, 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 CMRR (common mode reject ratio) limitations due to resistor matching and tolerance challenges,” said Jay Cormier, product line director, Advanced Linear Products, Analog Devices. “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 16V common mode input voltage range, which is 45% wider than the nearest competitor’s offering, the AD8230 is the only solution that maintains better than 50 nV/degree C offset drift over the automotive and extended industrial temperature range of −40 degrees C to +125 degrees C.

Competitors’ in-amps have significantly higher offset drift (nearly 50 times) above +85 degrees C. The 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.

Two matched external resistors are required to program the gain of the device, offering greater stability over single resistor programmed instrumentation amplifiers.

The AD8230 operates on ±4-V to ±8-V dual supplies, or +8-V to +16-V single supplies, with input and output rail-to-rail capability.

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

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