AD8656ARMZ-REEL

Overview

The AD8656ARMZ-REEL is a low noise, precision CMOS dual operational amplifier manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features rail-to-rail input and output capabilities. The device utilizes DigiTrim technology to achieve high DC accuracy with a maximum offset voltage of 250 µV over the common-mode voltage range. 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 total harmonic distortion plus noise of 0.0007%. It is qualified for automotive applications and operates within a temperature range of −40°C to +125°C.

Feature Summary

• Utilizes DigiTrim technology for post-package trimming to ensure high DC precision and low offset voltage.
• Features true rail-to-rail input and output architecture allowing operation across the full supply voltage range.
• Provides industry-leading low noise performance suitable for sensitive signal conditioning applications.
• Qualified for automotive applications ensuring reliability in demanding environments.

Applications

• ADC and DAC buffers
• Audio microphone pre-amplifiers and mixing consoles
• Industrial process controls
• Precision filters
• Automotive collision avoidance systems

Procurement Notes

Verify that the specific ordering suffix matches the required package type and reel configuration. Confirm that the component meets the necessary automotive qualification standards if intended for vehicle integration. Ensure the RoHS compliance status aligns with environmental regulations applicable to the target market. Cross-reference the datasheet revision to confirm all electrical parameters match the design requirements before finalizing procurement.

Selection Notes

Select this component when designing low voltage systems requiring high precision and minimal noise. The rail-to-rail capability makes it ideal for buffering wide dynamic range devices like ADCs in single-supply configurations. Consider its 28 MHz bandwidth and low THD+N for audio or video signal paths. Evaluate the need for external compensation if driving capacitive loads exceeding 200 pF to maintain stability.

Part Context

The AD8656 is the dual-channel version of the AD8655 single-channel amplifier. Both devices share identical electrical characteristics and utilize the same DigiTrim technology. They are designed to reduce PCB area and system costs compared to discrete solutions. The dual configuration allows designers to implement complex signal chains within a compact 8-lead MSOP or SOIC package.

Replacement Considerations

The AD8655 serves as the single-channel equivalent. For automotive variants, consider the AD8656W series which offers controlled manufacturing for quality and reliability requirements specific to automotive applications. Verify pin compatibility and thermal characteristics when substituting packages.

FAQ

Does the AD8656 exhibit phase reversal?

No, the AD8656 does not exhibit phase reversal for common-mode voltages within the power supply range.

What is the recommended approach for driving large capacitive loads?

While the device can drive up to 500 pF without oscillating, using an external RC snubber network is highly recommended to reduce overshoot and minimize ringing when driving capacitive loads greater than 200 pF.