ADA4661-2ACPZ-R7

Overview

The ADA4661-2ACPZ-R7 is a dual precision CMOS operational amplifier featuring rail-to-rail input and output capabilities. It operates on single supplies from 3 V to 18 V or dual supplies of ±1.5 V to ±9 V. The device utilizes DigiTrim technology for low offset voltage, achieving a maximum of 150 µV at VSY/2. Key electrical characteristics include a gain bandwidth product of 4 MHz, supply current of 725 µA per amplifier, and an input bias current of 15 pA. It is unity-gain stable and specified over the extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Precision performance achieved through patented DigiTrim trimming technique ensuring low offset voltage across the operating range.
• Rail-to-rail input and output stages allow full signal swing capability within the supply voltage limits.
• Low power consumption optimized for high voltage operation with minimal supply current draw.
• High common-mode rejection ratio and power supply rejection ratio maintained across wide operating conditions.

Applications

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

Procurement Notes

Verify the specific package variant upon ordering, as the base model supports both MSOP and LFCSP packages. Confirm that the R7 suffix corresponds to the reel packaging format required for your assembly line. Ensure compatibility with standard surface mount reflow profiles. Check for moisture sensitivity levels prior to storage and handling procedures.

Selection Notes

Select this component when designing systems requiring precision amplification with low power constraints. It is suitable for applications needing wide supply voltage flexibility without sacrificing bandwidth. Consider its rail-to-rail characteristics for maximizing dynamic range in single-supply environments. Evaluate thermal resistance values if operating near maximum temperature limits.

Part Context

This part belongs to Analog Devices' family of precision low-power operational amplifiers. It shares architectural similarities with other DigiTrim-based devices but offers dual-channel configuration. The component is designed to replace older bipolar or JFET amplifiers where lower power and wider supply ranges are necessary.

Replacement Considerations

Direct pin-compatible replacements may include other dual-channel precision amplifiers from the same manufacturer series. Verify electrical parameters such as offset voltage and bandwidth when substituting with similar parts from different vendors.

FAQ

What is the maximum input bias current specification?

The maximum input bias current is 15 pA at 25°C, increasing to 900 pA at +125°C.

Is the amplifier unity-gain stable?

Yes, the ADA4661-2 is unity-gain stable with a phase margin of 60 degrees under typical conditions.

How does the DigiTrim technique benefit the device?

DigiTrim allows for precise laser trimming of the offset voltage, resulting in significantly lower offset compared to standard CMOS amplifiers.