AD8655ARMZ

Overview

The AD8655ARMZ is a single-channel, low noise, precision CMOS operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output capabilities and operates 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. 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 is housed in an 8-lead MSOP package and supports operation from -40°C to +125°C.

Feature Summary

• Utilizes DigiTrim technology for post-package trimming to achieve high DC precision and low offset voltage.
• Features true rail-to-rail architecture allowing input and output signals to swing to both positive and negative supply rails.
• Provides low noise performance with sub-pA input bias current suitable for high-resolution data acquisition systems.

Applications

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

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature range. 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.

Selection Notes

Select this component for applications requiring high precision and low noise in single-supply systems. The rail-to-rail I/O capability maximizes dynamic range in low voltage environments. Consider the 28 MHz bandwidth and 11 V/µs slew rate for signal processing needs. Verify compatibility with capacitive loads to ensure stability without additional compensation networks.

Part Context

The AD8655ARMZ belongs to the AD8655/AD8656 family of low noise, precision CMOS amplifiers. The AD8655 denotes the single-channel version, while the AD8656 represents the dual-channel variant. Both share identical electrical characteristics and utilize the same DigiTrim technology for enhanced accuracy compared to standard CMOS amplifiers.

Replacement Considerations

The AD8655ARZ serves as a direct replacement offering the same electrical specifications but packaged in an 8-Lead SOIC instead of MSOP. For automotive applications, the AD8655WARMZ provides controlled manufacturing support for reliability requirements.

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 frequencies above 100 kHz to minimize ringing.