Zero Drift Amplifier for Medical Applications:Analog Devices


Semiconductor producer Analog Devices Inc. (ADI) has introduced its low-noise, zero-drift operational amplifier. The ADA4528 zero-drift op amp is designed for instrumentation and medical applications that require precision over time and temperature without system calibration. The breakthrough design achieves an ultra-low integrated voltage noise of 99 nVp-p over 0.1 – 10 Hz meaning that the ADA4528 delivers a 26% lower voltage noise at 40% less power consumption than the closest competing amplifiers, according to the company. This improves system SNR (signal-to-noise ratio) and lowers the noise floor, enabling 24-bit resolution over 150 kHz in A/D converters while improving system accuracy.

The ADA4528 zero-drift amplifier offers low offset voltage of 2.5 µV max and the industry’s lowest guaranteed offset-voltage drift of 0.015 µV/°C max, the firm claims. It has a 140 dB gain and a CMRR (common-mode rejection ratio) of 135 dB and a 130 dB PSRR (power-supply rejection ratio), making it well-suited for precision amplification of low-level signals in applications such as position and pressure sensors, strain gages and medical instrumentation. The ADA4528 is fully specified to operate from a 2.2 to 5.5-V single-voltage supply over the extended industrial temperature range (-40 to +125°C) and is available in an 8-lead MSOP (Mini Small Outline Package).

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