ADA4099-1BUJZ-RL7

Overview

The ADA4099-1BUJZ-RL7 is a single-channel, precision operational amplifier from Analog Devices featuring Over-The-Top input capability. It operates with supply voltages ranging from +3.15 V to +50 V and supports an ultrawide common-mode range extending up to −VS + 70 V. The device delivers an 8 MHz gain-bandwidth product and a 5.5 V/µs slew rate while consuming 1.5 mA per channel. Key electrical specifications include a maximum input offset voltage of ±40 µV, a typical noise density of 7 nV/√Hz at 100 Hz, and a low-power shutdown mode drawing a maximum of 20 µA. It is housed in a 6-lead TSOT package.

Feature Summary

• Over-The-Top input architecture allows signal detection even when biased beyond the positive supply rail.
• Robust front-end design tolerates abusive environments with high differential input voltage tolerance.
• Low power shutdown feature enables significant current reduction for duty-cycled system operation.
• Unity-gain stable with rail-to-rail output swing capabilities.

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 grade suffix (B or H) required for your temperature range, as the datasheet distinguishes between -40°C/+125°C and -55°C/+150°C operating ranges. Confirm the package type matches the BUJZ designation (TSOT-6). Ensure ESD precautions are followed during handling due to the sensitivity of the input stage. Cross-reference the ordering guide for availability of the reel packaging format.

Selection Notes

Select this component when designing circuits that require precise amplification of signals exceeding the positive supply voltage. It is suitable for applications demanding low noise and high common-mode rejection in harsh industrial settings. Consider the thermal resistance characteristics if operating near the upper limits of the supply voltage range. Evaluate the shutdown pin requirements if power management is a critical design constraint.

Part Context

This part belongs to the ADA4099 family of robust, precision op amps designed for over-the-top operation. The series includes single-channel (ADA4099-1) and dual-channel (ADA4099-2) variants. The ADA4099-1 is specifically packaged in a 6-lead TSOT, while the dual version offers SOIC_N, MSOP, and LFCSP options. These devices share core features like low offset voltage and high PSRR, targeting industrial and automotive sensor interfaces.

Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.

FAQ

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

The device utilizes two input stages: a common emitter stage for normal operation and a common base stage that activates when the common-mode voltage exceeds +VS by approximately 1.5 V, allowing inputs to reach up to +70 V above -VS.

What is the input bias current behavior in Over-The-Top mode?

In Over-The-Top mode (VCM > +VS), the input bias current increases significantly compared to normal operation, typically reaching around 82.5 µA due to the activation of the common base differential pair.