ADA4891-3ARZ

Overview

The ADA4891-3ARZ is a triple-channel, high-speed CMOS operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail output capability and operates on a single supply voltage ranging from 2.7 V to 5.5 V. The device provides a small-signal bandwidth of 220 MHz at a gain of +1 and achieves a slew rate of 170 V/µs. It exhibits low harmonic distortion with a 79 dBc SFDR at 1 MHz and settles to within 0.1% in 28 ns. The input common-mode range extends 300 mV below the negative rail, while the output swings to within 50 mV of the supply rails.

Feature Summary

• Triple-channel architecture with dedicated power-down pins for individual channel control
• Rail-to-rail output stage maximizing dynamic range across the supply voltage
• High-speed performance with fast settling time suitable for video applications
• Low quiescent current consumption per amplifier

Applications

• Automotive infotainment systems
• Imaging applications such as CCD buffers
• Active filters
• Coaxial cable drivers
• Photodiode preamplifiers

Procurement Notes

Verify the specific package variant against the datasheet ordering guide, as the ADA4891-3 series includes both SOIC and TSSOP options. Confirm that the required pinout matches the selected package type before finalizing procurement. Ensure the component meets automotive qualification standards if intended for vehicle electronics. Cross-reference the manufacturer part number with authorized distributors to confirm authenticity and traceability.

Selection Notes

Select this component when multiple high-speed amplification channels are required in a compact footprint. The integrated power-down feature allows for significant power savings in battery-operated or standby modes. Consider the 14-lead package constraints regarding thermal dissipation and PCB layout space. Verify that the input bias current and offset voltage specifications align with the precision requirements of the target signal path.

Part Context

This device belongs to the ADA4891 family of low-cost, high-performance CMOS amplifiers. The family includes single (ADA4891-1), dual (ADA4891-2), triple (ADA4891-3), and quad (ADA4891-4) channel variants. All members share identical electrical characteristics but differ in channel count and physical packaging to accommodate various design densities.

Replacement Considerations

Direct substitutes include other parts within the ADA4891 family, such as the ADA4891-4ARZ for quad-channel needs or the ADA4891-2ARMZ for dual-channel configurations. Ensure any replacement maintains the same package dimensions and pinout compatibility.