ADA4528-2ACPZ-R7

Overview

The ADA4528-2ACPZ-R7 is a dual-channel, precision, ultralow noise, zero-drift operational amplifier manufactured by 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. The device exhibits a maximum offset voltage of 2.5 µV and a maximum drift of 0.015 µV/°C. 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. It offers a minimum open-loop gain of 130 dB, CMRR of 135 dB, and PSRR of 130 dB. The unity-gain crossover frequency is 4 MHz, with a gain bandwidth product of 3 MHz at AV = +100. It is housed in an 8-lead LFCSP package.

Feature Summary

• Patented chopping technique provides ultralow input offset voltage and near-zero drift for high DC accuracy.
• Rail-to-rail input and output swing allows operation across the full supply voltage range.
• Ultralow broadband noise density without 1/f noise component ensures signal integrity in precision applications.
• High common-mode rejection ratio and power supply rejection ratio minimize errors from supply variations.

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 ACPZ-R7 against the manufacturer's current data sheet to confirm the package type (LFCSP) and reel quantity. Ensure the revision level matches the design requirements. Confirm that the exposed pad connection guidelines are followed during assembly to maintain thermal and electrical performance specifications.

Selection Notes

Select this component when designing circuits requiring minimal DC error sources such as offset voltage and drift. It is suitable for low-level signal amplification where ultralow noise is critical. Consider the 4 MHz unity-gain crossover frequency for bandwidth requirements. Verify that the operating temperature range of -40°C to +125°C meets the environmental constraints of the target application.

Part Context

This part belongs to the ADA4528 family of zero-drift operational amplifiers, which includes single-channel and quad-channel variants. The dual-channel configuration shares the same core architecture and electrical characteristics as the single-channel ADA4528-1. It is designed for high-precision applications requiring stability over temperature and time.

Replacement Considerations

Direct functional substitutes within the same family include the ADA4528-1 for single-channel applications. Other precision zero-drift amplifiers may require verification of pin compatibility and electrical parameter alignment.

FAQ

How does the chopper architecture affect the noise profile?

The patented chopping technique eliminates 1/f noise, resulting in a flat voltage noise density of 5.6 nV/√Hz at 1 kHz.

What is the recommended handling for the exposed pad in the LFCSP package?

The exposed pad should be connected to the negative supply voltage (V-) or left unconnected, as specified in the pin configuration diagrams.