AD8505

20 μA Maximum, Rail-to-Rail I/O, Zero Input Crossover Distortion Amplifiers AD8505/AD8506/AD8508 FEATURES PSRR: 100 dB minimum CMRR: 105 dB typical Very low supply current: 20 μA per amplifier maximum 1.8 V to 5 V single supply or ±0.9 V to ±2.5 V dual supply Rail-to-rail input/output Low noise: 45 nV/√Hz at 1 kHz 2.5 mV offset voltage maximum Very low input bias current: 1 pA typical APPLICATIONS Pressure and position sensors Remote security Bio sensors IR thermometers Battery-powered consumer equipment Hazard detectors GENERAL DESCRIPTION The AD8505/AD8506/AD8508 are single, dual, and quad micropower amplifiers featuring rail-to-rail input/output swings while operating from a single 1.8 V to 5 V power supply or from dual ±0.9 V to ±2.5 V power supplies. Using a new circuit technology, these amplifiers offer zero input crossover distortion (excellent PSRR and CMRR performance) and low bias current while operating with a supply current of less than 20 μA per amplifier. This amplifier family offers the lowest noise in its power class. This combination of features makes the AD8505/AD8506/AD8508 amplifiers ideal choices for battery-powered applications because they minimize errors due to power supply voltage variations over the lifetime of the battery and maintain high CMRR even for a railto-rail input op amp. Remote battery-powered sensors, handheld instrumentation, consumer equipment, hazard detection (for example, smoke, fire, and gas), and patient monitors can benefit from ...