AD8655ARMZ-REEL

Overview

The AD8655ARMZ-REEL is a single-channel, low noise, precision CMOS operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output capabilities, operating within a supply voltage range of 2.7 V to 5.5 V. The device utilizes DigiTrim technology for high DC accuracy, achieving a maximum offset voltage of 250 µV over the common-mode voltage range and a drift of 0.4 µV/°C typical. Key electrical specifications include a gain bandwidth product of 28 MHz, a slew rate of 11 V/µs, and an input voltage noise density of 2.7 nV/√Hz at 10 kHz. It provides an output current capability of ±220 mA and maintains unity gain stability.

Feature Summary

• Leverages DigiTrim technology to achieve high DC precision with low offset voltage and drift after packaging.
• Features true rail-to-rail architecture allowing input and output signal swing to extend to both positive and negative supply rails.
• Provides industry-leading low noise performance suitable for high-resolution data acquisition systems.
• Capable of driving capacitive loads up to 500 pF without oscillating.

Applications

• ADC and DAC buffers
• Audio microphone pre-amplifiers and mixing consoles
• Industrial controls and precision filters
• Digital scales
• Automotive collision avoidance systems

Procurement Notes

Verify that the specific ordering suffix matches the required package type and reel configuration. Confirm RoHS compliance status as indicated by the 'Z' suffix in the part number. Ensure the automotive qualification requirements are met if applicable, noting that standard commercial models differ from qualified automotive variants. Cross-reference the manufacturer's latest datasheet revision for any specification updates before finalizing procurement.

Selection Notes

Select this component when low noise and high precision are critical in single-supply systems. The rail-to-rail I/O capability maximizes dynamic range in low voltage applications. Consider the 28 MHz bandwidth and 11 V/µs slew rate for fast filter or video applications. Evaluate the need for external compensation when driving large capacitive loads exceeding recommended limits to ensure stability.

Part Context

This component belongs to the AD8655/AD8656 family of low noise, precision CMOS amplifiers. The AD8655 denotes the single-channel version, while the AD8656 is the dual-channel variant. Both share identical electrical characteristics and utilize the same DigiTrim technology. The ARMZ designation indicates an 8-lead MSOP package with RoHS compliance.

Replacement Considerations

The AD8656ARMZ-REEL serves as a functional substitute if dual channels are required, sharing identical electrical specifications. Other members of the AD865x series may be considered based on channel count requirements, provided pinout compatibility and package dimensions match the existing design constraints.

FAQ

Does the AD8655 exhibit phase reversal?

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

What is the maximum capacitive load the device can drive?

The AD8655 can drive capacitive loads up to 500 pF without oscillating, though external compensation is recommended for stability at higher frequencies.

How does DigiTrim technology benefit this amplifier?

DigiTrim allows for post-package trimming of the offset voltage, correcting mechanical stresses from assembly to achieve higher DC precision than standard CMOS amplifiers.