Precision instrumentation amp for sensor front-ends
It delivers a 1.3 MHz -3dB bandwidth and a 4V/µs slew rate, enough to handle industrial sensor outputs from thermocouples, strain gauges, and bridge transducers without rolling off the signal.
The 25 µV input offset voltage and 2 nA input bias current set the floor for DC measurement error — in a bridge application with a 10 mV full-scale output, the offset contributes 0.25% error before any gain is applied. The 1.3 MHz bandwidth supports gains up to 1000× without excessive noise bandwidth; beyond that, the gain-bandwidth product limits the usable frequency range. The 4V/µs slew rate ensures the output can swing rail-to-rail on a 10 V step in about 2.5 µs, adequate for multiplexed data-acquisition systems scanning at tens of kilohertz.
The INA128UA/2K5 operates from a single supply as low as 4.5 V up to 36 V, covering both 5 V and ±15 V industrial rails.