ADA4891-2ARMZ

Overview

The ADA4891-2ARMZ is a dual-channel, low-cost CMOS high-speed rail-to-rail operational amplifier manufactured by Analog Devices. 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 output stage swings to within 50 mV of either supply rail, maximizing dynamic range. Key electrical specifications include a small-signal bandwidth of 240 MHz at unity gain (G = +1), a slew rate of 170 V/µs, and a settling time to 0.1% of 28 ns. The device provides a linear output current of 125 mA at −40 dBc distortion and maintains a low quiescent current of 4.4 mA per amplifier.

Feature Summary

• Rail-to-rail output capability enabling maximum dynamic range with swing to within 50 mV of supply rails
• High-speed performance characterized by a 240 MHz small-signal bandwidth and 170 V/µs slew rate
• Low power consumption with a quiescent current of 4.4 mA per amplifier channel
• Single-supply operation with extended input common-mode range extending 300 mV below the negative rail

Applications

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

Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the ADA4891-2 family includes multiple variants. Confirm the component meets automotive qualification requirements if intended for vehicle electronics. Ensure the selected part number corresponds to the correct pinout and thermal characteristics for your PCB layout design.

Selection Notes

Select this component when a dual-channel configuration is required alongside high-speed signal processing capabilities. The device is suitable for designs needing wide bandwidth and fast settling times without the complexity of bipolar amplifiers. Consider the MSOP-8 package constraints regarding thermal dissipation and board space availability during the selection process.

Part Context

This component belongs to the ADA4891 family of low-cost CMOS amplifiers, which also includes single, triple, and quad-channel versions. The family shares identical core electrical specifications but varies in channel count and physical packaging options. The ADA4891-2 specifically integrates two independent amplifier channels into a compact footprint, offering a balanced solution for multi-channel signal conditioning tasks.

Replacement Considerations

Direct functional replacements within the same family include the ADA4891-1 (single channel) and ADA4891-3 (triple channel). Cross-family replacements require matching the 240 MHz bandwidth, 170 V/µs slew rate, and rail-to-rail I/O specifications while verifying pin compatibility.