ADA4891-2ARZ

Overview

The ADA4891-2ARZ is a dual-channel, low-cost CMOS high-speed rail-to-rail operational amplifier manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features an input common-mode voltage range extending 300 mV below the negative rail. The device provides a small-signal bandwidth of 240 MHz at a gain of +1 and achieves a slew rate of 170 V/µs with a settling time of 28 ns to 0.1%. It delivers a linear output current of 125 mA and maintains low distortion characteristics, including a spurious-free dynamic range of 79 dBc at 1 MHz. The quiescent current per amplifier is 4.4 mA, and it functions reliably within an operating temperature range of −40°C to +125°C.

Feature Summary

• Features true single-supply capability with an input voltage range that extends 300 mV below the negative supply rail.
• Provides maximum dynamic range through a rail-to-rail output stage capable of swinging to within 50 mV of each supply rail.
• Delivers high-speed performance with fast settling times suitable for active filter applications.
• Offers low distortion and low power consumption ideal for imaging and video signal processing.

Applications

• Automotive infotainment systems
• Imaging applications such as CCD buffers and contact image sensor buffers
• Consumer video equipment
• Active filters
• Coaxial cable drivers

Procurement Notes

Verify the specific package type and suffix against the manufacturer's official ordering guide before procurement. Confirm that the component meets automotive qualification requirements if intended for vehicle electronics. Ensure proper handling procedures are followed due to electrostatic discharge sensitivity. Cross-reference the datasheet revision to validate all electrical specifications against your design constraints.

Selection Notes

Select this component when a dual-channel configuration is required alongside high-speed signal processing capabilities. The wide supply voltage range supports both 3 V and 5 V system architectures. Consider the thermal resistance of the SOIC-8 package for heat dissipation in dense layouts. Evaluate the low noise density and high open-loop gain for precision signal conditioning tasks requiring minimal signal degradation.

Part Context

This part belongs to the ADA4891 family, which includes single, triple, and quad channel variants sharing identical core electrical characteristics. The family is designed to provide cost-effective, high-performance solutions for analog signal processing. While the channel count varies, the fundamental speed, power, and distortion metrics remain consistent across the series, allowing for scalable design implementations.

Replacement Considerations

Direct replacements include other members of the ADA4891 family, such as the ADA4891-1 (single channel) or ADA4891-4 (quad channel), provided the pinout compatibility and channel count requirements align with the application design.

FAQ

What is the input common-mode voltage range for the ADA4891-2?

The input common-mode voltage range extends from 300 mV below the negative supply rail to 800 mV below the positive supply rail.

Does the ADA4891-2 support shutdown functionality?

No, the ADA4891-2 does not feature a power-down pin; only the ADA4891-3 variant includes this disable feature.

What is the typical quiescent current per amplifier?

The typical quiescent current is 4.4 mA per amplifier at 5 V operation.