ADA4051-2ARMZ-RL

Overview

The ADA4051-2ARMZ-RL is a dual-channel, micropower, zero-drift operational amplifier manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 1.8 V to 5.5 V and features rail-to-rail input and output capabilities. The device utilizes an innovative chopping technique to achieve extremely low offset voltage of 15 µV maximum and offset drift of 20 nV/°C. Key electrical parameters include a gain-bandwidth product of 125 kHz, a typical supply current of 13 µA per amplifier, and high power supply rejection ratio (PSRR) and common-mode rejection ratio (CMRR) exceeding 110 dB. It is specified for the extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Utilizes an innovative chopping technique to suppress offset-related ripple in the DC domain without increasing in-band noise.
• Features rail-to-rail input and output swing capability for optimal dynamic range in low-voltage applications.
• Delivers micropower consumption with a typical supply current of 13 µA per amplifier channel.
• Provides high precision with very low offset voltage and minimal offset drift over temperature.

Applications

• Pressure and position sensors
• Temperature measurements
• Electronic scales
• Medical instrumentation
• Battery-powered equipment

Procurement Notes

Verify the specific package type and reel configuration when ordering. The suffix indicates tape and reel packaging. Confirm availability status as supply may be limited or subject to factory special orders. Ensure compatibility with the intended PCB footprint and soldering profile for the MSOP-8 package.

Selection Notes

Select this component for applications requiring high precision in battery-powered systems where low power consumption is critical. The zero-drift architecture eliminates the need for external chopper stabilization circuits. Consider the 125 kHz bandwidth and slew rate limitations for signal conditioning tasks involving slow-changing signals rather than high-frequency data acquisition.

Part Context

This part belongs to the ADA4051 series of CMOS micropower zero-drift operational amplifiers. The dual-channel variant offers two independent amplifiers in a compact surface-mount package. It shares architectural similarities with other Analog Devices zero-drift op amps but is optimized for ultra-low power operation compared to higher-speed counterparts in the portfolio.

Replacement Considerations

Check for pin-compatible alternatives within the same family such as the ADA4051-1 for single-channel needs. Verify that substitute devices maintain similar offset voltage, drift, and supply current specifications to ensure circuit performance remains unchanged.

FAQ

How does the ADA4051-2 handle offset-related ripple?

It uses an autocorrection feedback loop and a switched-capacitor notch filter synchronized with the chopping clock to null DC components and suppress ripple without disturbing the desired input signal.

Is the device stable at unity gain?

Yes, the ADA4051-2 is unity-gain stable, allowing it to be used as a buffer without risk of oscillation.