AD8571ARMZ

Overview

The AD8571ARMZ is a single-channel, zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output capabilities and operates on a single supply voltage ranging from 2.7 V to 5 V. Key electrical specifications include a maximum offset voltage of 10 μV across the temperature range, an input bias current of 1.5 nA maximum, and a gain bandwidth product of 1.5 MHz at 5 V. The device provides high open-loop gain of 145 dB typical, with a common-mode rejection ratio of 140 dB and power supply rejection ratio of 130 dB. It consumes approximately 975 μA per amplifier and is housed in an 8-lead MSOP package.

Feature Summary

• Utilizes spread-spectrum auto-zero technology to eliminate intermodulation distortion effects in AC applications without requiring external capacitors.
• Features rail-to-rail input and output swings, allowing operation with input common-mode voltages extending to both supply rails.
• Provides ultralow offset voltage and drift characteristics suitable for precision measurements where error sources cannot be tolerated.

Applications

• Temperature sensors
• Pressure sensors
• Precision current sensing
• Strain gage amplifiers
• Medical instrumentation

Procurement Notes

Verify the specific ordering suffix RM corresponds to the 8-lead MSOP package configuration required for the design. Confirm that the component meets RoHS compliance standards as indicated in manufacturer documentation. Ensure the selected variant supports the intended operating temperature range of -40°C to +125°C for industrial or automotive environments.

Selection Notes

Select this component when low DC offset and minimal drift are critical requirements for signal conditioning. The rail-to-rail I/O capability makes it suitable for single-supply systems with limited voltage headroom. Consider the 1.5 MHz bandwidth and slew rate for applications requiring moderate speed alongside high precision.

Part Context

The AD8571ARMZ belongs to the AD857x family of zero-drift amplifiers, which includes dual (AD8572) and quad (AD8574) variants. This family shares the same core architecture and performance characteristics, differing primarily in channel count and package options. The ARMZ designation specifically identifies the single-channel version in the MSOP package.

Replacement Considerations

Direct functional replacements within the same family include the AD8572 and AD8574 if additional channels are needed, provided pin compatibility is managed. Other packages such as SOIC (AD8571ARZ) offer identical electrical performance but require footprint adaptation.

FAQ

Does the AD8571ARMZ require external capacitors for stability?

No, the AD8571ARMZ does not require external capacitors for proper operation or stability due to its internal auto-zero correction topology.

What is the input offset voltage drift specification?

The input offset voltage drift is specified as 0.005 μV/°C typical over the operating temperature range of -40°C to +125°C.