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05-19-2011

Zero-drift op amp achieves lowest-voltage noise

Analog Devices » ADA4528

Christina Nickolas

Designed by Analog Devices for instrumentation and medical applications that require precision over time and temperature without system calibration, the ADA4528 zero-drift operational amplifier is claimed to achieve the lowest-voltage noise at 99 nVp-p over 0.1 to 10 Hz — meaning that the ADA4528 delivers a 26% lower voltage noise at 40% less power consumption than the closest competing amplifiers. This improves system SNR and lowers the noise floor, enabling 24-bit resolution over 150 kHz in A/D converters while improving system accuracy.

Analog Devices - ADA4528

Because of the op amp’s 5.3-nV/√Hz voltage noise, the company claims that for the first time a part of this kind can be used in broadband applications, such as piezoelectric transducers and precision data acquisition systems. Additional features include offset voltage of 2.5 µV max and a guaranteed offset-voltage drift of 0.015 µV/°C max. It has an open-loop voltage gain of 140 dB minimum, a CMRR of 135 dB, and a PSRR of 130 dB minimum. The ADA4528 is fully specified to operate from a 2.2 to 5.5-V single-voltage supply and ±1.1 to ±2.75 V for dual supply operation. Temperature range is from –40° to 125°C and housing is in 8-lead MSOP packages. ($1.15 ea/1,000 — available now.)

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