AD780ANZ

Overview

The AD780ANZ is a high-precision band gap voltage reference from Analog Devices, housed in an 8-Lead PDIP package. It provides pin-programmable outputs of 2.5 V or 3.0 V with a maximum initial accuracy of ±1 mV and a maximum temperature coefficient of 7 ppm/°C over the -40°C to +85°C range. The device operates from input voltages between 4.0 V and 36 V, drawing a maximum quiescent current of 1 mA. It supports series or shunt mode operation, sourcing or sinking up to 10 mA, and features a dedicated temperature output pin.

Feature Summary

• Pin-programmable selection between 2.5 V and 3.0 V output levels without external components
• Integrated temperature output pin providing linear voltage variation for system monitoring
• Capable of stable operation in both series and shunt modes for positive or negative references
• Low noise performance with optional external capacitors for further reduction

Applications

• Precision reference for high-resolution analog-to-digital converters (ADCs)
• Reference source for digital-to-analog converters (DACs)
• Temperature transducer applications utilizing the dedicated TEMP pin
• High-side current measurement circuits in telecommunications equipment

Procurement Notes

Verify the specific ordering suffix to confirm the package type and packing quantity. The AD780ANZ designation indicates an 8-Lead Plastic Dual In-Line Package supplied in tubes. Confirm RoHS compliance status as indicated by the Z suffix. Ensure the application requirements align with the specified industrial temperature range of -40°C to +85°C for this grade.

Selection Notes

Select the AD780ANZ when through-hole mounting is required for the 8-Lead PDIP form factor. This model offers a maximum drift of 7 ppm/°C, suitable for general-purpose precision applications. For lower drift requirements, consider the B-grade variants. Ensure the input voltage remains within the 4.0 V to 36 V range to maintain specified line regulation and stability characteristics.

Part Context

The AD780 series serves as a high-performance upgrade for legacy references like the LT1019 and AD680. It utilizes patented circuit techniques and laser trimming to achieve ultralow drift and high accuracy. The family includes A, B, and C grades with varying drift specifications, available in both PDIP and SOIC packages to support diverse PCB layout needs.

Replacement Considerations

The AD780 is explicitly documented as a pin-compatible performance upgrade for the LT1019(A)–2.5 and the AD680. Designers replacing these parts should verify that the new supply voltage range and current capabilities meet the existing circuit requirements.