ADR821ARMZ-R2

Overview

The ADR821ARMZ-R2 is a low-power precision reference and operational amplifier integrated in a 10-lead MSOP package. It features an on-board 2.5 V voltage reference with ±0.4% initial accuracy and 30 ppm/°C temperature drift, operating from 2.8 V to 15 V. The companion op amp supports dual supplies of ±2.8 V to ±15 V or single supply operation. Key electrical parameters include a maximum input offset voltage of 500 μV, a bias current of 50 nA, and a unity gain bandwidth of 1.0 MHz. Total supply current is under 400 μA.

Feature Summary

• Combines a precision voltage reference and a rail-to-rail output operational amplifier within a single compact package.
• Includes on-board precision resistors for flexible circuit configurations such as generating negative voltages or multiple outputs.
• Operates over an extended industrial temperature range from -40°C to +125°C.

Applications

• Battery-powered instrumentation
• Portable medical instrumentation
• Data acquisition systems
• Industrial process controls
• Automotive applications

Procurement Notes

Verify the specific suffix R2 indicates the 250-unit reel packaging option when ordering. Confirm that the A-grade specifications meet the required accuracy and drift tolerances for the design. Ensure the supply voltage range aligns with the minimum dropout requirements of the internal reference section during system integration.

Selection Notes

Select this component when space constraints require integrating both a stable reference and signal conditioning into one footprint. The ADR821 provides a higher reference voltage than the ADR827 variant. Consider the internal resistor matching if utilizing the onboard components for gain setting or level shifting applications.

Part Context

This device belongs to the ADR82x family which pairs a bandgap reference with a general-purpose op amp. The ADR821 specifically offers a 2.5 V reference output, distinguishing it from the 1.25 V ADR827 model. Both share identical amplifier characteristics and packaging options.

Replacement Considerations

ADR827ARMZ-R2

FAQ

Can the internal op amp generate a negative voltage?

Yes, by configuring the op amp as an inverting amplifier with a gain of -1 using the onboard resistors, the device can produce a -2.5 V output from the +2.5 V reference.

What is the function of the NC pin?

Pin 4 is designated as No Connect (NC) and should not be connected to any external components.