ADA4805-2ARMZ-R7

Overview

The ADA4805-2ARMZ-R7 is a dual-channel, high-speed voltage feedback operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail outputs and an ultralow quiescent current of 500 µA per amplifier. The device offers a −3 dB bandwidth of 105 MHz at a gain of +1 and a slew rate of 160 V/µs. It operates within a supply voltage range of 2.7 V to 10 V. Key electrical specifications include a maximum input offset voltage of 125 µV, a typical offset drift of 0.2 µV/°C, and low noise characteristics with 5.9 nV/√Hz at 100 kHz.

Feature Summary

• Features dynamic power scaling via an active-low shutdown pin that reduces quiescent current to approximately 2.9 µA while maintaining a fast turn-on time.
• Provides rail-to-rail output swing and wide input common-mode range suitable for single-supply or split-supply operation.
• Delivers high speed performance including 105 MHz bandwidth and 160 V/µs slew rate despite low power consumption.

Applications

• High resolution, high precision analog-to-digital converter (ADC) drivers
• Battery-powered instrumentation
• Micropower active filters
• Portable point of sales terminals
• Active RFID readers

Procurement Notes

Verify the specific package variant against the ordering guide, as the ADA4805-2 is available in multiple packages including 8-lead MSOP and 10-lead LFCSP. Confirm that the R7 suffix corresponds to the required tape and reel packaging format for your manufacturing process. Ensure compatibility with the intended supply voltage range of 2.7 V to 10 V during system design validation.

Selection Notes

Select this component when designing systems requiring both high bandwidth and minimal power consumption. The dual configuration is suitable for differential signal paths or dual-channel data acquisition. Consider the thermal resistance of the 8-lead MSOP package if operating near maximum ambient temperatures. The shutdown feature makes it ideal for applications requiring periodic power-down between sampling intervals.

Part Context

This part belongs to the ADA4805 family of rail-to-rail amplifiers, which also includes the single-channel ADA4805-1. The family utilizes Analog Devices' extra fast complementary bipolar (XFCB) process to achieve low voltage and current noise. While the ADA4805-1 is packaged in 6-lead SOT-23 or SC70, the ADA4805-2 provides two channels in compact surface-mount packages like the MSOP.

Replacement Considerations

Direct functional substitutes within the same family include the ADA4805-2ACPZ-R7 (10-LFCSP package). Single-channel equivalents are the ADA4805-1ARJZ-R7 (SOT-23-6) and ADA4805-1ARMZ-R7 (SC70-6). Verify pinout compatibility and package dimensions before substituting.