The ADA4505-2/ADA4505-4 are dual and quad micropower amplifiers featuring rail-to-rail input and 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. Employing a new circuit technology, these low cost amplifiers offer zero input crossover distortion (excellent PSRR and CMRR performance) and very low bias current, while operating with a supply current of less than 10 A per amplifier. This combination of features makes the ADA4505-2/ADA4505-4 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 rail-to-rail op amp.