AD780AR

Overview

The AD780AR 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 and high initial accuracy with a maximum variation of ±1 mV. It operates in series or shunt modes, sourcing or sinking up to 10 mA, and includes a dedicated temperature output pin for transducer applications.

Feature Summary

• Pin-programmable selection between 2.5 V and 3.0 V output levels without external components
• Ultralow temperature drift achieved through laser trimming of internal resistors
• Integrated temperature output pin providing linear voltage response to ambient changes
• Capable of stable operation in both series and shunt configurations

Applications

• Precision reference for high-resolution analog-to-digital converters
• Reference source for digital-to-analog converters
• Temperature transducer circuits utilizing the dedicated output pin
• General-purpose precision reference applications requiring low noise

Procurement Notes

Verify the specific package option when ordering, as the AD780AR designation corresponds to the SOIC-8 package. Confirm RoHS compliance status if required, noting that suffixes such as Z indicate compliant parts. Ensure the input supply voltage remains within the specified 4 V to 36 V range to maintain performance specifications. Check for any recent product change notifications regarding manufacturing sites.

Selection Notes

Select the AD780AR when a pin-selectable 2.5 V or 3.0 V output is required from a single component. It is suitable for designs needing superior temperature stability compared to standard references. Consider this part for applications where low headroom allows operation from a 5 V supply while generating a 3.0 V output. Evaluate the need for the temperature output feature if system calibration or monitoring is necessary.

Part Context

The AD780 belongs to a family of high-precision band gap voltage references designed for demanding analog signal processing environments. It serves as a performance upgrade for legacy references like the LT1019 and AD680. The device utilizes patented circuit techniques and precision thin-film resistors to minimize drift and noise, making it a standard choice for enhancing the dynamic range and accuracy of data conversion systems.

Replacement Considerations

The AD780 is documented as a pin-compatible performance upgrade for the LT1019(A)-2.5 and the AD680. Designers replacing these older components should verify that the new reference meets the specific accuracy and drift requirements of the existing design.