AD8420ARMZ-R7

Instrumentation, Op Amps, Buffer Amps Overview

The AD8420ARMZ-R7 is a micropower instrumentation amplifier from Analog Devices, housed in an 8-lead MSOP package. It operates on a single supply of 2.7 V to 36 V or dual supplies of ±2.7 V to ±18 V. Key electrical parameters include a maximum quiescent current of 90 µA, a minimum common-mode rejection ratio (CMRR) of 100 dB, and a small-signal bandwidth of 250 kHz at unity gain. The device features rail-to-rail output swing, an input offset voltage of up to 125 µV, and a slew rate of 1 V/µs.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Indirect current feedback architecture enabling excellent input common-mode range and rail-to-rail output independent of input common-mode voltage.
• Micropower consumption with a maximum supply current of 90 µA, optimized for battery-powered applications.
• High precision performance including low offset voltage drift and high CMRR suitable for amplifying small differential signals near ground.
• Robust input protection allowing operation with large differential input voltages without damage.

Instrumentation, Op Amps, Buffer Amps Applications

• Bridge amplifiers
• Pressure measurement
• Medical instrumentation
• Portable data acquisition
• Multichannel systems

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix R7 indicates reel packaging when sourcing components. Confirm that the operational temperature range extends to +125°C while specifications are guaranteed from -40°C to +85°C. Ensure the 8-lead MSOP footprint matches the PCB design requirements. Check for RoHS compliance status as indicated in official documentation.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component for designs requiring wide supply ranges and low power consumption. The indirect current feedback topology allows signal amplification even when the common-mode voltage is near the negative rail. Consider the 100 dB minimum CMRR and 250 kHz bandwidth for general-purpose precision applications. Evaluate external resistor matching for optimal gain accuracy and drift performance.

Instrumentation, Op Amps, Buffer Amps Part Context

The AD8420 belongs to Analog Devices' family of micropower instrumentation amplifiers. It utilizes a novel indirect current feedback architecture distinct from traditional three-op-amp designs. This structure provides flexible design options and robust performance in the presence of large common-mode signals. The ARMZ-R7 variant specifically denotes the surface-mount MSOP package configuration.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Consult official Analog Devices documentation for verified cross-reference part numbers. Substitutions should match the 8-lead MSOP package and similar electrical characteristics such as supply range and quiescent current.