Analog: 16-V, Zero-Drift Instrumentation Amplifier Replaces Discrete Kluges

The 16-V AD8230 zero-drift precision instrumentation amplifier can be used in instrumentation environments where ground potentials vary by several volts. It also replaces custom designs made from discrete zero-drift amps and resistors. According to its manufacturer, the amp is the industry's first zero-drift in-amp to operate at 16 V. It maintains better than 50 nV/°C offset drift from ­40°C to 125°C. Its 110-dB (min) common-mode rejection ratio rejects line noise in measurements where the sensor is far from the instrumentation or when it exhibits dc offset change over temperature. The AD8230 operates on ±4- to ±8-V dual supplies or +8- to +16-V single supplies, with input and output rail-to-rail capability. Packaged in an eight-lead small-outline IC, it costs $2.95 in 1000-piece quantities.