ADA4528-1ACPZ-R2

Overview

The ADA4528-1ACPZ-R2 is a precision, ultralow noise, zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output capabilities and operates on single supplies from 2.2 V to 5.5 V or dual supplies from ±1.1 V to ±2.75 V. The device exhibits a maximum offset voltage of 2.5 µV and a drift of 0.015 µV/°C. Noise performance includes 97 nV p-p in the 0.1 Hz to 10 Hz band and 5.6 nV/√Hz at 1 kHz. It maintains unity-gain stability with a 4 MHz crossover frequency and 3 MHz gain bandwidth product at AV = +100. Open-loop gain, CMRR, and PSRR minimums are 130 dB, 135 dB, and 130 dB respectively. It functions within an industrial temperature range of −40°C to +125°C.

Feature Summary

• Utilizes patented chopping architecture for ultralow offset voltage and drift correction.
• Features rail-to-rail input and output swing for maximum dynamic range.
• Provides high open-loop gain and excellent common-mode and power supply rejection ratios.

Applications

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

Procurement Notes

Verify that the ordering suffix ACPZ-R2 corresponds to the specific 8-lead LFCSP package and tape-and-reel delivery format required for your assembly process. Confirm the component revision matches the latest Rev. F datasheet specifications. Ensure the supplier provides valid traceability documentation for this Analog Devices Inc. part number before finalizing procurement.

Selection Notes

Select this component when designing circuits requiring precise amplification of low-level DC signals without significant thermal drift errors. The ultralow noise density makes it suitable for sensitive sensor interfaces. Verify that the required supply voltage falls within the 2.2 V to 5.5 V range and that the PCB layout accommodates the 8-lead LFCSP footprint.

Part Context

This device belongs to the ADA4528 family of zero-drift operational amplifiers, which also includes the dual-channel ADA4528-2. The family is designed for high-precision applications where traditional chopper amplifiers might introduce excessive noise or complexity. The ADA4528-1ACPZ-R2 specifically denotes the single-channel variant in the LFCSP package.

Replacement Considerations

The ADA4528-1ARMZ serves as a direct functional replacement offering identical electrical characteristics but utilizes an 8-lead MSOP package instead of the LFCSP form factor. Designers must adjust the PCB footprint and reflow profile accordingly when substituting between these package types.

FAQ

How does the internal ESD protection affect normal operation?

Internal ESD diodes connect the inputs to the supply rails. During normal operation, they remain reverse-biased. If input voltages exceed the rails by more than 300 mV, the diodes conduct, requiring external series resistors to limit current and prevent damage.

What is the typical voltage noise density at 1 kHz?

The typical voltage noise density is 5.6 nV/√Hz at 1 kHz with a gain of +100 and a 2.5 V supply. At 5 V, the typical value is 5.9 nV/√Hz.