AD780BN

Overview

The AD780BN is an ultrahigh precision band gap reference voltage IC manufactured by Analog Devices Inc. It provides a pin-programmable output of either 2.5 V or 3.0 V from input voltages ranging between 4.0 V and 36 V. The device features a maximum temperature drift of 3 ppm/°C over the -40°C to +85°C range and supports both series and shunt mode operations for positive or negative outputs without external components. It includes a dedicated temperature output pin, low quiescent current consumption, and noise reduction capabilities.

Feature Summary

• Pin-programmable selection between 2.5 V and 3.0 V output levels
• Ultralow temperature drift with laser trimming for high accuracy
• Integrated temperature output pin for system monitoring
• Capable of sourcing or sinking up to 10 mA in series or shunt modes

Applications

• High resolution analog-to-digital converters (ADCs)
• Digital-to-analog converters (DACs)
• Precision instrumentation systems
• Temperature transducer configurations

Procurement Notes

Verify the specific package variant required, as the AD780BN designation typically corresponds to the PDIP package while the SOIC equivalent is designated AD780BR. Confirm RoHS compliance status if applicable, as ordering suffixes like 'Z' indicate compliant parts. Ensure the selected grade meets the required initial accuracy and drift specifications for the target application environment.

Selection Notes

Select the AD780BN when high precision and low drift are critical requirements for analog signal chains. The device allows for flexible configuration via pin programming to support either 2.5 V or 3.0 V references. Consider the integrated temperature output feature if ambient monitoring is needed within the same component footprint. Verify that the input supply voltage remains within the specified operational range to ensure stable performance.

Part Context

The AD780 series serves as a high-performance upgrade for legacy references such as the LT1019 and AD680. It offers superior stability and lower noise compared to standard band gap references. The part is designed to enhance the dynamic range of data converters and improve overall system accuracy in demanding industrial and scientific applications.

Replacement Considerations

The AD780BN is a direct pin-compatible performance upgrade for the LT1019(A)-2.5 and the AD680. Designers replacing these older components should verify that the new input voltage headroom requirements are met, particularly for the 3.0 V output mode which requires a minimum input of 4.5 V.