ADA4661-2ARMZ

Overview

The ADA4661-2 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, with a maximum supply current of 725 µA per amplifier. The device achieves a gain bandwidth product of 4 MHz and a slew rate of 2 V/µs. Input offset voltage is specified at a maximum of 150 µV at 25°C, increasing to 600 µV across the extended industrial temperature range of −40°C to +125°C. Input bias current remains low at 15 pA typical.

Feature Summary

• Utilizes DigiTrim trimming technique for high precision offset voltage performance
• Supports wide single-supply (3 V to 18 V) and dual-supply operation
• Provides rail-to-rail input and output swing capability
• Maintains low power consumption while delivering 4 MHz bandwidth

Applications

• Current shunt monitors
• Active filters
• Portable medical equipment
• High impedance sensor interfaces
• Battery powered instrumentation

Procurement Notes

Verify the specific package variant required, as the component is available in both 8-lead MSOP and 8-lead LFCSP formats. Confirm that the selected part meets the necessary thermal resistance requirements for the intended PCB layout. Ensure compatibility with the operating voltage range and temperature specifications before finalizing procurement orders.

Selection Notes

Select this component when low power consumption is critical alongside precision signal conditioning. The wide supply voltage range accommodates various battery and system architectures. Consider the rail-to-rail I/O feature for maximizing dynamic range in low-voltage applications. Verify that the 4 MHz bandwidth aligns with the signal frequency requirements of the design.

Part Context

This dual-channel amplifier belongs to Analog Devices' family of precision low-power op amps. It shares architectural similarities with other CMOS amplifiers but distinguishes itself through the integration of DigiTrim technology. This allows it to maintain superior offset voltage characteristics compared to standard CMOS devices without sacrificing power efficiency or bandwidth.

Replacement Considerations

ADA4666-2ARMZ

FAQ

How does the DigiTrim technique affect the offset voltage?

The DigiTrim technique enables the ADA4661-2 to achieve a maximum input offset voltage of 150 µV at 25°C, providing higher precision than standard CMOS amplifiers.

What is the common-mode rejection ratio specification?

The CMRR is typically 135 dB when operating between 1.5 V and 16.5 V at 25°C, ensuring effective rejection of common-mode signals within that range.