AD780AN

Overview

The AD780AN is an ultrahigh precision band gap reference voltage device 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 component features a maximum temperature drift of 7 ppm/°C over the -40°C to +85°C range and maintains high accuracy with a maximum initial error of ±1 mV for both voltage options. It operates in series or shunt mode, capable of sourcing or sinking up to 10 mA, and includes a dedicated temperature output pin.

Feature Summary

• Pin programmable selection between 2.5 V and 3.0 V output levels
• Integrated temperature output pin for transducer applications
• Capable of series or shunt mode operation for positive or negative references
• Low quiescent current consumption with noise reduction capability

Applications

• High resolution analog-to-digital converters (ADCs)
• Digital-to-analog converters (DACs)
• Precision general-purpose reference applications
• Temperature transducer circuits

Procurement Notes

Verify the specific suffix requirements when ordering, as the base model designation may differ from the RoHS-compliant variant found in official documentation. Confirm package availability and lead times directly with authorized distributors, as stock levels fluctuate. Ensure the selected part matches the required operating temperature range and electrical specifications for your design.

Selection Notes

Select the AD780AN when a plastic dual in-line package is required for through-hole mounting. This grade offers a specified temperature coefficient of 7 ppm/°C, which is higher than the B and C grades but suitable for many industrial applications. Consider the A-grade specifications if cost is a primary factor and the slightly higher drift is acceptable within the system budget.

Part Context

The AD780 series serves as a high-performance replacement for older reference designs like the LT1019 and AD680. It utilizes a unique low headroom amplifier design that allows a 3.0 V output from inputs as low as 4.5 V. The device is laser-trimmed for low initial error and temperature drift, ensuring stability without external components in most standard configurations.

Replacement Considerations

The AD780ANZ is the RoHS-compliant version of the AD780AN. Direct pin-compatible upgrades include the AD780BN and AD780BR for lower drift requirements, though these require different package types or grades.