AD8571ARZ-REEL7

This family of amplifiers has ultralow offset, drift, and bias current. The AD8571/AD8572/AD8574 are single, dual, and quad amplifiers, respectively, featuring rail-to-rail input and output swings. All are guaranteed to operate from 2.7 V to 5 V single supply. The AD8571/AD8572/AD8574 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using topology, these zerodrift amplifiers combine low cost with high accuracy. (No external capacitors are required.) Using a spread-spectrum, auto-zero technique, the AD8571/AD8572/AD8574 eliminate the intermodulation effects from interaction of the chopping function with the signal frequency in ac applications. With an offset voltage of only 1 μV and drift of 0.005 μV/°C, the AD8571/AD8572/AD8574 are perfectly suited for applications where error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. Many more systems require the rail-to-rail input and output swings provided by the AD8571/AD8572/AD8574. The AD8571/AD8572/AD8574 are specified for the extended industrial/ automotive temperature range -40°C to +125°C.

Applications

• Temperature sensors
• Pressure sensors
• Precision current sensing
• Strain gage amplifiers
• Medical instrumentation
• Thermocouple amplifiers

Key features

• Low offset voltage: 1 μV
• Input offset drift: 0.005 μV/°C
• Rail-to-rail input and output swing
• 5 V/2.7 V single-supply operation
• High gain: 145 dB typical
• CMRR: 140 dB typical
• PSRR: 130 dB typical
• Ultralow input bias current: 10 pA typical
• Low supply current: 750 μA per op amp
• Overload recovery time: so μs
• No external capacitors required