AD8656ARZ-REEL7

Overview

The AD8656ARZ-REEL7 is a dual-channel, low noise, precision CMOS operational amplifier from Analog Devices. It features DigiTrim technology for high DC accuracy and operates on a single supply voltage ranging from 2.7 V to 5.5 V. The device offers rail-to-rail input and output capabilities, ensuring compatibility with wide dynamic range devices in single-supply systems. Key electrical specifications include a gain bandwidth product of 28 MHz, an input voltage noise density of 2.7 nV/√Hz at 10 kHz, and a maximum offset voltage of 250 µV over the common-mode voltage range.

Feature Summary

• Utilizes DigiTrim technology to achieve high DC precision by trimming offset voltage after packaging.
• Features true rail-to-rail input and output architecture extending to both positive and negative supply rails.
• Provides low noise performance suitable for high-resolution data acquisition and audio applications.
• Operates within a temperature range of -40°C to +125°C.

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. Ensure the automotive qualification requirements are met if applicable, noting that standard commercial models differ from qualified automotive variants. Cross-reference the datasheet revision to confirm current specifications.

Selection Notes

Select this component for applications requiring low noise and high precision in low voltage environments. The dual-channel configuration reduces board space compared to single-channel alternatives. Consider the 28 MHz bandwidth and slew rate for signal processing needs. Verify that the power supply voltage stays within the 2.7 V to 5.5 V operating range for optimal performance.

Part Context

The AD8656 is part of the AD8655/AD8656 family of precision CMOS amplifiers. It serves as the dual-channel counterpart to the single-channel AD8655. Both share identical electrical characteristics and utilize the same DigiTrim technology. The family is designed for general-purpose precision applications where low noise and high accuracy are critical.

Replacement Considerations

The AD8655ARZ-REEL7 is the single-channel equivalent within the same family. Automotive qualified versions are available as AD8656WARMZ-REEL or AD8656WARMZ-RL. Direct pin-compatible replacements should be verified against specific electrical parameters such as noise density and bandwidth.

FAQ

Does the AD8656 exhibit phase reversal?

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

What is the typical open-loop gain?

The open-loop gain is typically 110 dB when loaded with a 10 kΩ resistor.

How does DigiTrim technology benefit the device?

DigiTrim corrects offset voltages caused by mechanical stresses during assembly, resulting in higher DC accuracy than standard CMOS amplifiers.