AD8574AR

Overview

The AD8574AR is a quad zero-drift operational amplifier from Analog Devices Inc., designed for single-supply operation between 2.7 V and 5 V. It features rail-to-rail input and output capabilities, ensuring maximum dynamic range in low-voltage systems. The device utilizes a spread-spectrum auto-zero technique to achieve an ultralow offset voltage of 1 μV typical and minimal drift of 0.005 μV/°C. With a typical gain of 145 dB and CMRR of 140 dB at 5 V, it provides high precision without external capacitors. The AD8574AR operates within the extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Zero-drift architecture using spread-spectrum auto-zero stabilization eliminates intermodulation distortion and maintains low offset over temperature.
• Rail-to-rail input and output stages allow signal swing across the entire supply voltage range.
• Ultralow input bias current and offset voltage ensure high accuracy in sensitive measurement applications.
• No external capacitors are required for stability or offset correction.

Applications

• Precision strain gage amplifiers
• Thermocouple amplifiers
• Medical instrumentation
• Temperature sensors
• Pressure sensors

Procurement Notes

Verify the package suffix 'R' corresponds to the 14-lead narrow SOIC configuration as specified in the ordering guide. Confirm the operating temperature range meets the application requirements of −40°C to +125°C. Ensure supply voltages remain within the 2.7 V to 5.5 V absolute maximum ratings to prevent damage. Check datasheet specifications for input bias current limits under specific load conditions.

Selection Notes

Select the AD8574AR when four independent precision channels are required in a single package. Choose this component for applications demanding minimal offset drift without external compensation components. Consider the rail-to-rail I/O capability if signals approach the supply rails. Verify that the 1 MHz gain bandwidth product is sufficient for the required signal frequencies.

Part Context

The AD8574AR belongs to the AD857x family of zero-drift amplifiers, which includes the single (AD8571), dual (AD8572), and quad (AD8574) variants. All members share identical electrical characteristics and internal topology but differ in channel count and package options. The AD8574 specifically integrates four amplifiers in a 14-lead SOIC or TSSOP package, offering space efficiency for multi-channel systems.

Replacement Considerations

Direct substitutes include other parts from the AD857x family such as the AD8571AR or AD8572AR, provided the channel count matches the design needs. Cross-referencing with other zero-drift op-amps requires verifying pin compatibility and electrical parameter equivalence.

FAQ

Does the AD8574AR require external capacitors for stability?

No, the AD8574AR does not require external capacitors for offset correction or stability due to its integrated spread-spectrum auto-zero technology.

What is the input common-mode voltage range?

The input common-mode voltage range extends from ground to the positive supply rail, enabling true rail-to-rail input operation.