AD780BNZ

Overview

The AD780BNZ is a high-precision band gap voltage reference from Analog Devices, housed in an 8-pin PDIP package. It provides a pin-programmable output of either 2.5 V or 3.0 V, selected by grounding Pin 8 for 3.0 V or leaving it unconnected for 2.5 V. The device operates with input voltages between 4.0 V and 36 V. Key electrical specifications include a maximum temperature coefficient of 3 ppm/°C over the -40°C to +85°C range, a quiescent current of 1 mA max, and low noise characteristics of 4 µV p-p (0.1 Hz to 10 Hz). It supports both series and shunt modes, sourcing or sinking up to 10 mA.

Feature Summary

• Pin-programmable selection between 2.5 V and 3.0 V outputs without external components
• Ultralow drift performance with laser-trimmed initial accuracy and temperature coefficients
• Integrated temperature output pin providing linear voltage variation with ambient temperature
• Capable of stable operation in both series and shunt configurations for positive or negative references

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 temperature output pin
• High-side current measurement circuits requiring stable biasing

Procurement Notes

Verify that the specific order matches the required package type, as the AD780 family includes SOIC variants. Confirm the Z suffix indicates RoHS compliance. Ensure the application circuit respects the absolute maximum ratings, particularly regarding input voltage limits and power dissipation constraints within the operating temperature range.

Selection Notes

Select the AD780BNZ when superior drift performance compared to standard grades is required. The B-grade specification ensures tighter tolerance limits for output voltage drift across the industrial temperature range. Consider the low headroom design if the system requires a 3.0 V output from a supply close to 4.5 V, maximizing dynamic range for downstream data converters.

Part Context

The AD780 is part of Analog Devices' ultrahigh precision band gap reference family. It serves as a direct pin-compatible upgrade for legacy parts like the LT1019(A)–2.5 and AD680. The component is designed to enhance the performance of high-resolution data converters by providing low noise and stability without requiring external buffering or complex trimming networks.

Replacement Considerations

The AD780BRZ is a surface-mount alternative offering identical electrical performance in an 8-Lead SOIC_N package.