ADA4528-1ARMZ

Overview

The ADA4528-1ARMZ is a precision, ultralow noise, zero-drift operational amplifier featuring rail-to-rail input and output swing. It offers an offset voltage of 2.5 µV maximum and drift of 0.015 µV/°C maximum. Voltage noise density is 5.6 nV/√Hz at 1 kHz with 97 nV p-p in the 0.1 Hz to 10 Hz band. The device operates on single supplies from 2.2 V to 5.5 V or dual supplies from ±1.1 V to ±2.75 V. Key dynamic parameters include a unity-gain crossover frequency of 4 MHz, gain bandwidth product of 3 MHz at AV = +100, and slew rate of 0.5 V/µs at 5 V supply. It provides minimum open-loop gain of 130 dB, CMRR of 135 dB, and PSRR of 130 dB.

Feature Summary

• Patented chopping technique eliminates low-frequency noise and minimizes DC error sources.
• Rail-to-rail input and output capability ensures maximum dynamic range across the full supply voltage.
• Zero-drift architecture maintains extremely low offset voltage and drift over temperature variations.
• High common-mode rejection and power supply rejection ratios enhance signal integrity.

Applications

• Thermocouple and thermopile signal conditioning
• Load cell and bridge transducer amplification
• Precision instrumentation systems
• Electronic scales
• Medical instrumentation

Procurement Notes

Verify the specific package type (MSOP-8) and suffix (ARMZ) against the manufacturer's current ordering guide to ensure compatibility with PCB footprint requirements. Confirm that the component meets RoHS compliance standards as indicated in the datasheet specifications before finalizing procurement orders for production integration.

Selection Notes

Select this component for applications requiring high DC precision and minimal noise without external trimming. Ensure the design accommodates the extended industrial temperature range of -40°C to +125°C. Consider the 1.5 mA supply current for power-sensitive designs and verify that the load capacitance does not exceed stability limits for unity-gain configurations.

Part Context

The ADA4528-1ARMZ belongs to the Analog Devices ADA4528 family of zero-drift operational amplifiers. This series includes single-channel (ADA4528-1) and dual-channel (ADA4528-2) variants. The ARMZ suffix denotes the MSOP-8 package variant with lead-free termination, distinguishing it from other package options like LFCSP available within the same functional family.

Replacement Considerations

Direct pin-compatible substitutes within the same family include the ADA4528-2 for dual-channel requirements. Verify electrical parameter equivalence for critical noise and offset specifications when considering alternative manufacturers' zero-drift amplifiers.

FAQ

How does the chopper architecture affect the noise profile?

The patented chopping technique modulates the input signal to eliminate 1/f noise and minimize offset voltage drift, resulting in a flat broadband noise density of 5.6 nV/√Hz at 1 kHz.

What are the absolute maximum input voltage limits?

Input voltages can exceed the supply rails by up to 300 mV without causing permanent damage due to internal ESD protection diodes, provided the input current is limited to 10 mA or less.