Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifiers

The EL8171 and EL8172 are micropower instrumentation amplifiers optimized for operation at 2.9V to 5V single supplies. Inputs and outputs can operate rail-to-rail. As with all instrumentation amplifiers, a pair of inputs provide very high common-mode rejection and are completely independent from a pair of feedback terminals. The feedback terminals allow zero input to be translated to any output offset, including ground. A feedback divider controls the overall gain of the amplifier.

Features

• 78µA maximum supply current

• Maximum input offset voltage

- 300µV (EL8172)

- 1000µV (EL8171)

• 200pA maximum input bias current

• 3µV/°C offset voltage drift

• 450kHz -3dB bandwidth (G = 10)

• 170kHz -3dB bandwidth (G = 100)

• 0.5V/µs slew rate

• Single supply operation

- Input voltage range is rail-to-rail

- Output swings rail-to-rail

• Output sources and sinks ±29mA load current

• 0.2 gain accuracy

• Pb-free plus anneal available (RoHS compliant)

Applications

• Battery- or solar-powered systems

• Strain gauges

• Current monitors

• Thermocouple amplifiers