ADA4084-1ARZ

Overview

The ADA4084-1ARZ is a single-supply, low noise operational amplifier featuring rail-to-rail input and output capabilities. It operates from +3 V to +30 V (±1.5 V to ±15 V) with a typical supply current of 0.625 mA per amplifier at ±15 V. The device offers a gain bandwidth product of 15.9 MHz and a unity-gain crossover frequency of 9.9 MHz. Key electrical characteristics include a maximum offset voltage of 100 µV for the SOIC package, a typical slew rate of 4.6 V/µs, and a voltage noise density of 3.9 nV/√Hz at 1 kHz. It is specified over an industrial temperature range of −40°C to +125°C.

Feature Summary

• Rail-to-rail input and output operation enables full signal swing in single-supply systems.
• Low power consumption with typical supply current of 0.625 mA per amplifier.
• High precision with low offset voltage and low long-term drift characteristics.
• Unity-gain stable design suitable for direct feedback configurations.

Applications

• Battery-powered instrumentation
• High-side and low-side sensing
• Power supply control and protection
• Telecommunications equipment
• DAC output amplifiers and ADC input buffers

Procurement Notes

Verify the specific package type matches the required PCB footprint, as the ADA4084 series is available in multiple packages including SOT-23, SOIC, MSOP, LFCSP, TSSOP, and larger LFCSP variants. Ensure the ordering suffix corresponds to the correct pin configuration and reel/tray specifications defined in the manufacturer's official ordering guide. Confirm that the selected variant meets the thermal resistance requirements for the intended application environment.

Selection Notes

Select this component when both wide bandwidth and low noise are required in a single-supply architecture. The rail-to-rail I/O feature makes it ideal for applications where maximizing dynamic range is critical. Consider the specific package options based on thermal management needs and board space constraints. The device is suitable for transducer interfaces such as Hall effect, piezoelectric, and resistive sensors requiring high common-mode rejection and precision DC performance.

Part Context

The ADA4084-1 is part of a family of high-voltage, low-noise operational amplifiers from Analog Devices. This family includes dual (ADA4084-2) and quad (ADA4084-4) variants sharing similar electrical characteristics. The series is designed to provide a balance of speed, noise performance, and power efficiency for portable and industrial applications. Other members of the low-noise op amp portfolio include the AD8597, ADA4004, and AD8675 series.

Replacement Considerations

Direct functional substitutes within the same family include the ADA4084-2 (dual) and ADA4084-4 (quad). For single-channel replacements, consider other Analog Devices rail-to-rail input/output amplifiers with comparable noise and bandwidth specifications, ensuring pin compatibility or redesigning the schematic if pinouts differ.

FAQ

Is the ADA4084-1ARZ unity-gain stable?

Yes, the datasheet explicitly states that the ADA4084-1 is unity-gain stable.

What is the maximum supply voltage for the ADA4084-1?

The absolute maximum supply voltage rating is ±18 V, which corresponds to a total supply voltage of 36 V. However, the recommended operating range is up to +30 V (±15 V).

Does the ADA4084-1 support rail-to-rail input signals?

Yes, the device features rail-to-rail inputs, allowing the common-mode voltage to extend from the negative supply rail to the positive supply rail.