ADA4098-2HRZ

Overview

The ADA4098-2HRZ is a dual-channel, precision operational amplifier manufactured by Analog Devices Inc. It features Over-The-Top input capability with an ultrawide common-mode range extending from −VS − 0.1 V to −VS + 70 V. The device operates on supply voltages ranging from +3 V to +50 V and consumes 165 µA per channel. Key electrical specifications include a maximum input offset voltage of ±35 µV, a gain-bandwidth product of 1.05 MHz, and a slew rate of 0.85 V/µs. It supports low power shutdown and withstands high temperatures up to +150°C.

Feature Summary

• Over-The-Top input stage allows operation beyond the positive supply rail without phase reversal
• Robust input protection tolerates differential voltages up to ±80 V
• Low quiescent current consumption optimized for battery-powered applications
• High precision performance with minimal input offset voltage drift

Applications

• Industrial sensor signal conditioning
• Supply current sensing
• Battery and power supply monitoring
• Front-end amplifiers in abusive environments
• 4 mA to 20 mA transmitters

Procurement Notes

Verify the specific H grade suffix ensures compliance with the extended temperature range requirements of -55°C to +150°C. Confirm that the package type matches the design constraints for thermal management and PCB layout. Ensure the ordering information aligns with the manufacturer's latest datasheet revision to avoid discrepancies in pinout or electrical characteristics.

Selection Notes

Select this component when high DC accuracy is required alongside robustness against overvoltage conditions. The dual-channel configuration reduces board space compared to single-channel alternatives. Consider the Over-The-Top feature if the application involves sensing currents near the high-side supply rail where standard rail-to-rail inputs would fail.

Part Context

This part belongs to the ADA4098 family of precision amplifiers designed for harsh industrial environments. It shares core architectural similarities with the ADA4098-1 but provides two independent channels within a single package. The series is characterized by its ability to maintain precision while operating under extreme common-mode voltage stress.

Replacement Considerations

ADA4098-2ARUZ

FAQ

How does the Over-The-Top input stage function?

The device utilizes a secondary common-base input pair that activates when the common-mode voltage exceeds the positive supply rail minus 1.25 V, allowing continuous operation up to +70 V above the negative supply.

What is the input bias current behavior during Over-The-Top operation?

While the bias current is typically below 700 pA in normal operation, it increases to approximately 8 µA when the input enters the Over-The-Top region due to the activation of the secondary input stage.