AD8221

The AD8221 is a high-performance instrumentation amplifier from ADI that improves on the classic AD620 with a lower input offset voltage, a lower offset drift and a lower voltage noise, which suits a precision measurement where the error budget is tight. A single external resistor sets the gain, and the gain is specified over the full temperature range rather than only at 25 degrees, so a design that must hold its accuracy across a harsh environment keeps a predictable error. The part provides a high common-mode rejection that remains strong across the frequency range, which matters when a switching stage injects a common-mode disturbance onto a small sensor signal, and the low input current limits the error with a high source impedance. The output is referenced to a pin, so the stage can level-shift into an analog-to-digital converter, and the supply range spans about ±2.3 V to ±18 V with a low current. The internally trimmed resistors remove the need for external matching, and the small SOIC package fits a dense board. Typical applications include a precision medical or a scientific instrument, a strain-gauge and a load-cell bridge, a thermocouple measurement, a data-acquisition front end and an industrial process-control input. Every device BeiLuo ships is factory-traceable and includes an import declaration, a certificate of origin and a RoHS compliance file. Our FAE team helps you choose the gain and the supply and plan the layout and the grounding.