AD8646ARMZ

Overview

The AD8646ARMZ is a dual-channel, rail-to-rail input and output operational amplifier manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.7 V to 5.5 V. The device features a gain bandwidth product of 24 MHz and a slew rate of 11 V/μs. Key electrical specifications include a maximum offset voltage of 2.5 mV, an input bias current of 1 pA, and a supply current of 2 mA per amplifier. It provides a short-circuit output current of 120 mA and maintains unity gain stability.

Feature Summary

• Rail-to-rail input and output capability for wide dynamic range in single-supply systems
• Low input bias current of 1 pA suitable for high-impedance sensor interfaces
• High output drive capability with 120 mA short-circuit current
• Automotive qualification available for robust industrial applications

Applications

• Battery-powered instruments
• Multipole filters
• ADC front ends
• Photodiode amplifiers
• Barcode scanners

Procurement Notes

Verify the package type matches the design requirements, as the AD8646 series includes SOIC and MSOP options. Confirm RoHS compliance status through official documentation. Ensure the selected variant meets specific automotive or commercial temperature ranges if required by the application environment. Cross-reference the ordering guide for exact suffix definitions.

Selection Notes

Select this component when low noise and wide bandwidth are critical for signal integrity. The rail-to-rail performance allows for maximum signal swing in low-voltage single-supply designs. Consider the MSOP package for space-constrained PCB layouts. Verify that the 2 mA supply current aligns with power budget constraints for portable devices.

Part Context

The AD8646 is part of the AD8646/AD8647/AD8648 family of 24 MHz rail-to-rail amplifiers. While the AD8646 is a dual-channel device without shutdown, the AD8647 adds a power-down function, and the AD8648 offers four channels. All variants share similar electrical characteristics regarding bandwidth, noise, and offset voltage.

Replacement Considerations

Direct pin-compatible substitutes within the same family include the AD8647 (with shutdown) and AD8648 (quad channel). For single-channel needs, the AD8645 may be considered. Verify package dimensions and thermal resistance when substituting between SOIC and MSOP formats.