ADR280ARTZ-R2

Overview

The ADR280ARTZ-R2 is a 1.2 V band gap core voltage reference from Analog Devices, designed for applications with heavy dynamic supply variations. It operates within a supply voltage range of 2.4 V to 5.5 V and delivers a precision output of 1.200 V typical. The device features ultralow power consumption with a maximum supply current of 16 μA and excellent line regulation at 2 ppm/V typical. It offers high power supply ripple rejection of –80 dB at 220 Hz and low noise density of 12.5 nV/√Hz. The component is specified over an industrial temperature range of −40°C to +85°C and is housed in a compact 3-lead SOT-23 package.

Feature Summary

• Optimized band gap core allows users to tailor voltage, current, or transient response by adding external operational amplifiers.
• Designed specifically to reject input battery voltage variations during RF power amplifier activity in mobile stations.
• Provides excellent line regulation and high power supply ripple rejection capabilities.

Applications

• Data converter references in GSM, GPRS, and 3G mobile station applications
• Analog baseband ICs such as the AD6535
• Audio codecs, voltage regulators, and battery chargers

Procurement Notes

Verify the specific ordering suffix to confirm the package type and compliance status. The ARTZ suffix indicates RoHS compliance and the SOT-23 package format. Confirm the reel quantity matches design requirements, as options include 250 units per tube or 3,000 units per reel. Ensure the operating environment stays within the specified -40°C to +85°C range for guaranteed performance.

Selection Notes

Select this component when a flexible 1.2 V core is required rather than a fixed internal gain reference. It is suitable for designs needing to buffer the output for higher current loads or adjust the reference level using external op amps. Consider its low quiescent current and small footprint for portable electronics where space and battery life are critical constraints.

Part Context

This part belongs to the ADR280 family of ultralow power voltage references. It shares the same 1.2 V band gap core architecture but differs in packaging and compliance markings. Other variants include the AKS series in SC70 packages. The ARTZ designation specifically identifies the lead-free, RoHS-compliant version in the standard SOT-23 outline.

Replacement Considerations

Direct pin-compatible substitutes within the same family include the ADR280AKS-R2 (SC70 package) or ADR280ART-R2 (non-RoHS SOT-23). Verify that any replacement maintains the required 1.2 V output and meets the specific thermal and electrical specifications of the original design.

FAQ

Can the ADR280 be used to create a negative reference voltage?

Yes, a negative reference can be configured precisely without expensive tight tolerance resistors by using an external op amp to force the V- pin to the desired negative voltage while maintaining a 1.2 V difference between VOUT and V-.

What is the maximum load current the ADR280 can drive directly?

The device provides the core 1.2 V band gap voltage and is able to drive a maximum load of only 100 μA directly. For higher current applications, users must buffer the output with an external operational amplifier.