ADR540BKSZ-REEL7

Overview

The ADR540BKSZ-REEL7 is a high precision shunt mode voltage reference manufactured by Analog Devices Inc. It provides a fixed output voltage of 4.096 V with an initial accuracy of ±0.2% and a maximum temperature coefficient of 40 ppm/°C. The device operates within an industrial temperature range of −40°C to +85°C and requires an operating current between 50 μA and 15 mA. It features ultralow output voltage noise of 30 μV p-p from 0.1 Hz to 10 Hz and includes a trim terminal for adjusting the output voltage over a ±0.5% range without affecting the temperature coefficient. The component is housed in an ultracompact 3-Lead SC70 package.

Feature Summary

• Ultracompact 3-Lead SC70 package designed for space-critical applications
• Integrated trim terminal allows adjustment of output voltage over a ±0.5% range
• Stable operation without requiring an external compensation capacitor
• Pin compatible with LM4040/LM4050 devices

Applications

• Portable, battery-powered equipment
• Automotive systems
• Data acquisition systems
• Instrumentation and process control
• Energy measurement

Procurement Notes

Verify the specific ordering suffix Z indicates RoHS compliance when sourcing this component. Confirm that the B grade designation corresponds to the required ±0.2% initial accuracy and 40 ppm/°C temperature coefficient specifications. Ensure the SC70 package option matches the board layout requirements for the 3-Lead KS-3 footprint.

Selection Notes

Select this part when a precise 4.096 V reference is needed in a minimal footprint. The low minimum operating current of 50 μA makes it suitable for battery-powered designs. The availability of a trim terminal provides flexibility to correct system errors. Verify that the load current requirements fall within the specified 50 μA to 15 mA operating range for stable performance.

Part Context

This component belongs to the ADR520/ADR525/ADR530/ADR540/ADR550 series of high precision shunt voltage references. All members of this family share identical electrical characteristics regarding temperature coefficient, noise, and operating current, differing only in their nominal output voltages. The ADR540 specifically targets applications requiring a 4.096 V reference level.

Replacement Considerations

LM4040

FAQ

Does the ADR540 require an external capacitor for stability?

No, the device is designed to operate without an external capacitor between the positive and negative terminals, though it remains stable if a bypass capacitor is used.

What is the function of the TRIM3 pin on the ADR540?

The trim terminal allows users to adjust the output voltage over a ±0.5% range to trim out system errors without affecting the temperature coefficient of the device.