AD780CR

Overview

The AD780CR 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 low initial error, temperature drift of 7 ppm/°C max over the -40°C to +85°C range, and low output noise of 100 nV/√Hz. It operates in series or shunt mode, sourcing or sinking up to 10 mA, with a maximum quiescent current of 1 mA.

Feature Summary

• Pin-programmable selection between 2.5 V and 3.0 V output levels
• Ultralow drift performance achieved through laser trimming
• Capable of operating in both series and shunt modes for positive or negative references
• Integrated temperature output pin for system monitoring

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 AD780CR designation typically refers to the SOIC-8 tube version, while REEL7 indicates tape and reel packaging. Confirm RoHS compliance status if applicable to your manufacturing process. Ensure the input voltage supply remains within the 4 V to 36 V operational limits to maintain specified accuracy and stability during procurement planning.

Selection Notes

Select the AD780CR when high precision and low drift are critical requirements for industrial applications operating between -40°C and +85°C. Consider this component for designs requiring a programmable 2.5 V or 3.0 V reference without external adjustment components. Evaluate the need for the integrated temperature output feature if system calibration or ambient monitoring is part of the design scope.

Part Context

The AD780 belongs to a family of ultrahigh precision band gap references designed to enhance the performance of data converters. It serves as a direct pin-compatible upgrade for legacy references like the LT1019 and AD680. The CR grade specifically denotes the industrial temperature range specification within the broader AD780 product line offered in various packages.

Replacement Considerations

The AD780CR is a pin-compatible performance upgrade for the LT1019(A)-2.5 and the AD680. Designers replacing these older references should verify that the new input voltage headroom requirements and quiescent current characteristics align with the existing circuit topology.