ADA4528-1ARMZ-RL

Overview

The ADA4528-1ARMZ-RL is a single-channel, ultralow noise, zero-drift operational amplifier from Analog Devices Inc. It features rail-to-rail input and output capabilities and operates on a single supply of 2.2 V to 5.5 V or dual supplies of ±1.1 V to ±2.75 V. Key electrical specifications include a maximum offset voltage of 2.5 µV, an offset drift of 0.015 µV/°C, and a voltage noise density of 5.6 nV/√Hz at 1 kHz. The device offers a unity-gain crossover frequency of 4 MHz and a gain bandwidth product of 3 MHz at AV = +100. It is available in an 8-lead MSOP package with reel packaging.

Feature Summary

• Features a patented chopping technique for ultralow input offset voltage and drift correction.
• Provides rail-to-rail input and output swing for maximum dynamic range.
• Delivers industry-leading low broadband noise without 1/f noise components.
• Ensures high precision through typical CMRR of 158 dB and PSRR of 150 dB.

Applications

• Thermocouple and thermopile signal conditioning
• Load cell and bridge transducer amplification
• Precision instrumentation and electronic scales
• Medical instrumentation front ends
• Handheld test equipment

Procurement Notes

Verify the specific ordering suffix '-RL' corresponds to the reel packaging configuration required for your assembly process. Confirm that the 8-lead MSOP package dimensions align with your PCB footprint design. Ensure the component meets RoHS compliance standards applicable to your manufacturing region. Cross-reference the datasheet revision F specifications against your circuit requirements for temperature stability and noise performance.

Selection Notes

Select this component for applications requiring precise amplification of low-level DC signals where thermal drift and low-frequency noise are critical constraints. The rail-to-rail architecture supports single-supply operation, simplifying power management in portable devices. Consider the 4 MHz unity-gain bandwidth for applications needing moderate speed alongside high DC accuracy. Evaluate the 1.5 mA supply current against system power budgets.

Part Context

This part belongs to the ADA4528 family of zero-drift operational amplifiers, which also includes the dual-channel ADA4528-2. The family utilizes a unique chopper stabilization architecture to achieve microvolt-level offset voltages. Unlike traditional choppers, this design minimizes input current noise spikes, making it suitable for high-impedance sensor interfaces. The ADA4528-1 specifically provides a single amplifier channel in a compact surface-mount package.

Replacement Considerations

The ADA4528-2 serves as the dual-channel equivalent within the same family. For single-channel replacements, verify compatibility with other zero-drift amplifiers from Analog Devices such as the ADA4625-1, ensuring pinout and electrical parameters match the design requirements.

FAQ

How does the internal ESD protection affect input overvoltage conditions?

Internal ESD diodes connect the inputs to the supply rails. If an input exceeds the supply by more than 300 mV, these diodes forward bias. A series resistor must be used to limit input current to 10 mA or less to prevent permanent damage.

What is the typical input bias current for the ADA4528-1?

At 25°C with a 5 V supply, the typical input bias current is 90 pA. This value increases to a maximum of 300 pA across the full operating temperature range of -40°C to +125°C.