AD8656ARMZ

Overview

The AD8656ARMZ is a low noise, precision CMOS dual operational amplifier manufactured by Analog Devices Inc. It features DigiTrim technology for high DC accuracy with a maximum offset voltage of 250 µV and drift of 2.3 µV/°C. The device operates on a single supply from 2.7 V to 5.5 V and offers rail-to-rail input and output capabilities. Key electrical parameters 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 is qualified for automotive applications and functions within a temperature range of −40°C to +125°C.

Feature Summary

• Utilizes DigiTrim technology to achieve high DC precision and low offset voltage after packaging.
• Provides true rail-to-rail input and output swing capability for wide dynamic range applications.
• Features extremely low input bias current suitable for high impedance source 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 and precision filters
• Automotive collision avoidance systems

Procurement Notes

Verify the specific package variant (MSOP or SOIC) and suffix requirements against the official ordering guide. Confirm that the automotive qualification status aligns with project specifications if required. Ensure compatibility with the intended operating voltage range and temperature extremes before finalizing procurement decisions.

Selection Notes

Select this component for designs requiring low noise and high precision in single-supply systems. The rail-to-rail I/O makes it suitable for buffering ADCs/DACs where signal integrity is critical. Consider the 28 MHz bandwidth and low distortion for high-speed data acquisition or audio processing tasks requiring minimal signal degradation.

Part Context

The AD8656ARMZ belongs to the AD8655/AD8656 family of precision CMOS amplifiers. It serves as the dual-channel counterpart to the single-channel AD8655. Both devices share identical electrical characteristics and utilize Analog Devices' proprietary DigiTrim technology to correct offset voltages caused by mechanical stress during assembly.

Replacement Considerations

The AD8655ARZ is the single-channel equivalent within the same family. Designers should verify pinout compatibility and channel count requirements when substituting components. Automotive grade variants are available under the AD8656W model designation.

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 maximum capacitive load the AD8656 can drive?

The AD8656 can drive capacitive loads up to 500 pF without oscillating, though external compensation is recommended for loads greater than 200 pF to minimize ringing.