Zero-Drift Amplifiers: A Look at the AD8230:Some applications require extreme precision over temperature and time. In many instances, an instrument can only be calibrated during manufacture; designers must ensure that the system does not drift out of specification afterwards. Such applications call for “zero-drift” instrumentation amplifiers such as the AD8230. It uses an offset correction scheme, referred to as auto-zeroing, to reduce its offset voltage and offset drift to a maximum of 10 mV and 50 nV/°C, respectively. Its 6 kHz sampling input provides 120 dB of common-
mode rejection at all gains. The AD8230 offers a wider input common-mode voltage range than traditional three-op-amp instrumentation amplifiers and the lowest offset drift over the extended, industrial temperature range of –40°C to +125°C.