ADR280ART-REEL7

Overview

The ADR280ART-REEL7 is a 1.2 V band gap core voltage reference manufactured by Analog Devices Inc., packaged in a 3-lead SOT-23 configuration with reel packaging. It operates within a supply voltage range of 2.4 V to 5.5 V and supports an industrial temperature range of −40°C to +85°C. The device features a typical output voltage of 1.200 V, maximum line regulation of 12 ppm/V, and maximum power supply current of 16 μA. Key performance metrics include a temperature coefficient of 40 ppm/°C maximum, output noise density of 12.5 nV/√Hz, and power supply ripple rejection of −80 dB at 220 Hz.

Feature Summary

• Provides a stable 1.2 V band gap core reference optimized for applications experiencing heavy dynamic supply variations.
• Features excellent line regulation and high power supply ripple rejection capabilities.
• Allows users to tailor voltage, current, or transient response by adding external operational amplifiers.

Applications

• Data converter references in GSM, GPRS, and 3G mobile station applications
• Analog baseband ICs such as the AD6535 requiring rejection of battery voltage fluctuations during RF power amplifier activity
• Portable battery-operated electronics and wireless devices

Procurement Notes

Verify that the specific ordering suffix corresponds to the required package type and compliance status. The ART designation indicates the SOT-23 package, while the REEL7 suffix specifies tape and reel packaging quantities. Confirm RoHS compliance requirements against the Z suffix if necessary. Ensure the operating environment falls within the specified -40°C to +85°C temperature range and supply voltage limits of 2.4 V to 5.5 V for proper functionality.

Selection Notes

Select this component when a low-power, compact voltage reference is needed for systems with significant supply noise. The architecture allows flexibility for custom output voltages and currents via external op amps. Consider the SOT-23 package for space-constrained designs. Evaluate the need for buffering if load currents exceed the internal 100 μA drive capability or if higher current sourcing is required for ADC references.

Part Context

The ADR280 belongs to the family of ultralow power voltage references designed for precision analog applications. Unlike many band gap references with fixed internal gain, this device provides a bare 1.2 V core, offering greater design flexibility at the cost of requiring external components for specific output adjustments. It is distinct from shunt references and supervisor circuits, focusing on series regulation for sensitive data converters.

Replacement Considerations

Direct functional substitutes are not explicitly listed in the provided documentation. Designers may evaluate other Analog Devices band gap cores or general-purpose references with similar PSRR and noise specifications, ensuring compatibility with the 2.4 V to 5.5 V supply range and SOT-23 footprint.

FAQ

Can the ADR280 provide a negative reference voltage?

Yes, a negative reference can be configured using an external operational amplifier circuit, as the voltage difference between VOUT and V– is maintained at 1.2 V.

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

The device can drive a maximum load of only 100 μA directly. For higher current applications, an external buffer amplifier is required.