AD8231

Data Sheet AD8231 Zero Drift, Digitally Programmable Instrumentation Amplifier FEATURES ► Digitally/pin-programmable gain ► G = 1, 2, 4, 8, 16, 32, 64, or 128 ► Specified from −40°C to +125°C ► 50 nV/°C maximum input offset drift ► 10 ppm/°C maximum gain drift ► Excellent dc performance ► 80 dB minimum CMR, G = 1 ► 15 µV maximum input offset voltage ► 500 pA maximum bias current ► 0.7 µV p-p noise (0.1 Hz to 10 Hz) ► Good ac performance ► 2.7 MHz bandwidth, G = 1 ► 1.1 V/μs slew rate ► Rail-to-rail output ► Shutdown/multiplex ► Extra op amp ► Single-supply range: 3 V to 5 V ► Dual-supply range: ±1.5 V to ±2.5 V ► Qualified for automotive applications APPLICATIONS ► Pressure and strain transducers ► Thermocouples and RTDs ► Programmable instrumentation ► Industrial controls ► Weigh scales ► Automotive controls GENERAL DESCRIPTION The AD8231 is a low drift, rail-to-rail, instrumentation amplifier with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128. The gains are programmed via digital logic or pin strapping. The AD8231 is ideal for applications that require precision performance over a wide temperature range, such as industrial temperature sensing and data logging. Because the gain setting resistors are internal, maximum gain drift is only 10 ppm/°C for gains of 1 to 32. Because of the auto-zero input stage, maximum input offset is 15 µV and maximum input offset drift is just 50 nV/°C. CMRR is 80 dB for G = 1, increasing to 110 dB at higher gains. The AD8231 als...