ADA4891-4ARZ

Overview

The ADA4891-4ARZ is a quad-channel, low-cost CMOS high-speed 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, with a slew rate of 170 V/µs and a settling time to 0.1% of 28 ns. Key electrical specifications include an input offset voltage of ±2.5 mV, an input bias current of ±50 pA, and a quiescent current of 4.4 mA per amplifier. It supports a linear output current of 125 mA and offers a common-mode rejection ratio of 88 dB.

Feature Summary

• Rail-to-rail output stage enables maximum dynamic range by swinging within 50 mV of the supply rails.
• High-speed performance characterized by a 220 MHz bandwidth and 170 V/µs slew rate for fast signal processing.
• Low distortion profile with 79 dBc SFDR at 1 MHz, suitable for precision video applications.
• Single-supply operation with extended input voltage range extending 300 mV below the negative rail.

Applications

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

Procurement Notes

Verify the specific package type and temperature grade against the official Analog Devices ordering guide before procurement. Confirm that the component meets automotive qualification requirements if intended for vehicle electronics. Ensure compatibility with the target PCB footprint for the 14-lead SOIC or TSSOP package. Check for any recent datasheet revisions that may impact parameter tolerances.

Selection Notes

Select this component when multiple high-speed amplifiers are required in a compact form factor. The quad configuration reduces board space compared to using individual single-channel devices. Consider the 220 MHz bandwidth and 170 V/µs slew rate for applications requiring rapid signal transitions. Evaluate the 4.4 mA per amplifier power consumption against system energy constraints.

Part Context

The ADA4891-4ARZ belongs to the ADA4891 family of low-cost, high-speed CMOS amplifiers. This family includes single (ADA4891-1), dual (ADA4891-2), triple (ADA4891-3), and quad (ADA4891-4) channel variants. All members share similar electrical characteristics, including rail-to-rail outputs and wide supply voltage ranges, but differ in channel count and pin configurations.

Replacement Considerations

Direct substitutes within the same family include the ADA4891-1, ADA4891-2, and ADA4891-3, provided the application requires fewer channels. For quad-channel replacements, verify pinout compatibility between 14-lead SOIC and TSSOP packages if changing package styles.

FAQ

Does the ADA4891-4 have a power-down feature?

No, the power-down feature is available only on the ADA4891-3 variant. The ADA4891-4 does not include dedicated power-down pins.

What is the input voltage range relative to the supply rails?

The input voltage range extends 300 mV below the negative supply rail, allowing for true single-supply operation.