ADR1581BRTZ-R2

Overview

The ADR1581BRTZ-R2 is a micropower, precision shunt voltage reference providing a nominal 1.250 V output. It operates within a wide current range of 60 μA to 10 mA and features an initial accuracy of ±1 mV with a maximum temperature drift of 50 ppm/°C. The device exhibits low dynamic output impedance (0.5 Ω) and broadband noise of 20 μV rms across the 10 Hz to 10 kHz bandwidth. Designed for industrial applications, it functions reliably between −40°C and +85°C while maintaining stability with any capacitive load.

Feature Summary

• Utilizes proprietary curvature correction techniques to minimize nonlinearities in voltage output temperature characteristics.
• Maintains stability when connected to any value of external capacitive load without oscillation.
• Provides high electrostatic discharge protection rated at 4 kV via the human body model.

Applications

• Portable, battery-powered equipment
• Cellular phones, notebook computers, PDAs, GPSs, and DMMs
• 3 V/5 V, 8-bit to 12-bit data converters

Procurement Notes

Verify that the specific ordering suffix matches the required packaging format, as the datasheet lists both REEL7 and R2 options for this part number. Confirm RoHS compliance status through official manufacturer documentation before finalizing procurement. Ensure the component grade aligns with the specified initial accuracy and temperature coefficient requirements for the target application.

Selection Notes

Select this component when a stable 1.25 V reference is needed in space-constrained designs requiring the SOT-23 package. The B-grade specification ensures tighter initial accuracy and lower temperature drift compared to the A-grade variant. Consider the minimum operating current of 60 μA when designing bias circuits for ultra-low power consumption systems.

Part Context

This device belongs to the ADR1581 family of micropower, precision shunt voltage references manufactured by Analog Devices. It serves as a compact alternative to larger packages while delivering high performance suitable for portable electronics and data acquisition systems. The family includes variants with different accuracy grades and packaging options to suit various design constraints.

Replacement Considerations

ADR1581ARTZ-R2

FAQ

How does the ADR1581 handle large capacitive loads?

The ADR1581 is designed to be stable with any value of capacitive load. However, driving loads exceeding 1000 pF may cause ringing due to additional poles formed by the load capacitance and output impedance.

What is the turn-on settling time for the ADR1581?

The total turn-on settling time to within 1.0 mV is approximately 6 μs. There is no long thermal tail observed when the horizontal scale is expanded to 2 ms/div.