ADA4661-2ACPZ-RL

Overview

The ADA4661-2ACPZ-RL is a dual precision CMOS operational amplifier featuring rail-to-rail input and output capabilities. It operates on supply voltages ranging from 3 V to 18 V single-supply or ±1.5 V to ±9 V dual-supply configurations. The device achieves low power consumption with a maximum supply current of 725 µA per amplifier. Key electrical specifications include a typical gain bandwidth product of 4 MHz, an input offset voltage of 150 µV maximum at VSY/2, and an input bias current of 15 pA maximum. It utilizes the DigiTrim technique for enhanced precision.

Feature Summary

• Utilizes patented DigiTrim trimming technology to achieve high precision and low offset voltage across the operating range.
• Supports wide supply voltage operation from 3 V to 18 V while maintaining low power consumption characteristics.
• Features rail-to-rail input and output stages allowing full signal swing capability within the supply rails.

Applications

• Current shunt monitors
• Active filters
• Portable medical equipment
• Buffer and level shifting circuits
• High impedance sensor interfaces

Procurement Notes

Verify the specific package type required for the design, as the component is available in both 8-lead MSOP and 8-lead LFCSP formats. Confirm that the reel packaging aligns with automated assembly requirements. Ensure the selected variant meets the extended industrial temperature range specifications if operating in extreme environments. Cross-reference the datasheet revision to confirm all electrical parameters match the design constraints before finalizing procurement.

Selection Notes

Select this component when designing circuits requiring high precision combined with low power consumption over a wide voltage range. The rail-to-rail I/O functionality makes it suitable for single-supply systems where maximizing dynamic range is critical. Consider the 4 MHz bandwidth for applications requiring moderate speed without excessive power draw. Verify that the low input bias current meets the requirements for interfacing with high-impedance sensors.

Part Context

This part belongs to the ADA4661 family of precision amplifiers designed by Analog Devices. It is specifically optimized for applications demanding low power operation alongside high bandwidth and wide supply voltage flexibility. The dual-channel configuration allows for cost-effective implementation of differential or multi-stage signal conditioning circuits in compact surface-mount packages.

Replacement Considerations

The ADA4666-2 is a documented alternative within the same product family offering similar precision and low-power characteristics. Designers should verify pin compatibility and ensure that the replacement meets the specific voltage and current requirements of the existing circuit layout.

FAQ

How does the DigiTrim technique affect the offset voltage?

The DigiTrim technique allows the ADA4661-2 to achieve a significantly lower input offset voltage compared to standard CMOS amplifiers, ensuring higher precision across the operating temperature range.

What is the common-mode rejection ratio (CMRR) performance?

The CMRR is typically 135 dB at 18 V supply with a common-mode voltage between 1.5 V and 16.5 V, dropping to a minimum of 110 dB over the full industrial temperature range.