The AD8231 is a precision, single-supply, low-noise, low-power, low input-offset drift instrumentation amplifier. Its input bias current is 500pA, input offset voltage is 15µV, input offset drift is 50nV/°C, maximum output bandwidth is 2.7MHz and gain range is 1~128, which can be programmed by a single pin.
The AD8231 instrumentation amplifier provides precision performance over a wide temperature range (‑40 °C to +125 °C) and is suited for industrial temperature sensing, data logging, and other high‑accuracy applications. It offers digitally or pin‑programmable gains of 1 to 128, an integrated uncommitted op‑amp, and a shutdown mode that limits current to 1 µA.
Key features include rail‑to‑rail input and output, 80 dB minimum CMRR at gain = 1 (up to 110 dB at higher gains), 27 MHz bandwidth at gain = 1, 1.1 V/µs slew rate, and a 4 mm × 4 mm 16‑lead LFCSP package. The device operates from a single supply of 3 V to 6 V or dual supplies of ±1.5 V to ±3 V.
| Gain options | 1, 2, 4, 8, 16, 32, 64, 128 |
|---|---|
| Gain error (G=1) | 0.05 % |
| CMRR (G=1) | 80 dB |
| Bandwidth (G=1) | 27 MHz |
| Slew rate | 1.1 V/µs |
| Input bias current | 250 pA (typical) |
| Input offset voltage | 4 µV (min) – 15 µV (max) |
| Quiescent current (normal operation) | 4 mA – 5 mA |
| Shutdown current | Maximum 1 µA |
| Supply voltage range | 3 V to 6 V (single) or ±1.5 V to ±3 V (dual) |
The AD8231 supports digitally or pin‑programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128.
In shutdown mode the device limits current to a maximum of 1 µA.
The AD8231 is specified for operation from –40 °C to +125 °C.