AD8651ARZ

Overview

The AD8651ARZ is a single-channel, precision, low noise CMOS operational amplifier manufactured by Analog Devices Inc. It features a gain bandwidth product of 50 MHz and a slew rate of 41 V/µs. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V. Key electrical specifications include a typical input offset voltage of 100 µV, an input bias current of 1 pA, and a voltage noise density of 4.5 nV/√Hz at 100 kHz. It provides rail-to-rail input and output swing capabilities.

Feature Summary

• Utilizes DigiTrim in-package trimming technology to measure and correct offset voltage across the entire common-mode range.
• Features true rail-to-rail input architecture using parallel NMOS and PMOS differential pairs for extended common-mode voltage coverage.
• Provides rail-to-rail output swing capability with high drive strength up to 40 mA.
• Ensures no phase reversal occurs when operating within the power supply voltage limits.

Applications

• Optical communications
• Laser source drivers and controllers
• Broadband communications systems
• Video line drivers

Procurement Notes

Verify the specific package variant (SOIC_N or MSOP) required for the design, as the base part number covers both. Confirm that the ordering suffix matches the desired reel or tube packaging format. Ensure the component meets RoHS compliance standards if applicable to the manufacturing process. Validate that the supply voltage range aligns with the system's power constraints.

Selection Notes

Select this component for applications requiring high speed combined with precision DC accuracy. The low input bias current makes it suitable for high-impedance sensor interfaces. Consider the thermal resistance values when designing for high ambient temperatures. The rail-to-rail characteristics are optimal for single-supply low-voltage designs where maximizing dynamic range is critical.

Part Context

This component belongs to the AD865x family of amplifiers, which also includes the dual-channel AD8652. The family is characterized by its combination of high-speed performance and precision attributes enabled by post-assembly trimming. It is designed to replace older generation amplifiers in high-performance data acquisition and communication circuits.

Replacement Considerations

The AD8652 serves as the dual-channel counterpart within the same family. Designers should verify pin compatibility and ensure that the single-channel configuration meets the board space requirements compared to multi-channel alternatives.

FAQ

Does the AD8651 exhibit phase reversal?

No, the amplifier does not exhibit phase reversal for common-mode voltages within the power supply range.

How is the offset voltage managed?

Offset voltage is managed using DigiTrim technology, which trims the amplifier after assembly to correct for mechanical stresses and ensures precision across the entire common-mode range.