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I am trying to make a dc/low frequency sensor output measurement. Which op amp is best suited for such applications?

Question asked by NikkiT Employee on Feb 18, 2011
Latest reply on Mar 7, 2011 by VickyW

For low frequency measurement, 1/f noise is a major error contributor. It is therefore necessary to use a zero-drift amplifier which eliminates 1/f noise. The ADA4528-1, the lowest noise zero-drift amplifier in the semiconductor industry, is suitable for dc and sub-Hz signal measurement. It features a low offset voltage of 2.5µV max, an offset voltage drift of 0.015µV/°C max and no 1/f noise. Voltage noise density is only 5.6nV/√Hz. Additionally, it has a wide operating supply range of 2.2V to 5.5V, high gain and excellent CMRR and PSRR specifications, making it ideal for precision amplification of low level signals.


The device is offered in a compact 8-lead MSOP package. Refer to the attached ADA4528-1 datasheet for more info.