AD694JNZ

Overview

The AD694JNZ is a monolithic current transmitter manufactured by Analog Devices Inc., designed to drive standard 4–20 mA or 0–20 mA current loops for process control applications. It accepts high-level voltage inputs, which are buffered and scaled by an internal input amplifier. The device supports precalibrated input spans of 0 V to 2 V and 0 V to 10 V via simple pin strapping, with other ranges programmable using external resistors. It features a precision voltage reference adjustable to 2.000 V or 10.000 V and operates on single or dual supplies within a wide range of 4.5 V to 36 V. The component exhibits typical nonlinearity of 0.002% and includes an open-loop alarm capability.

Feature Summary

• Accepts high-level signal inputs to drive standard 4-20 mA current loops for controlling valves and actuators
• Features a buffered input amplifier for scaling signals or buffering current mode DAC outputs
• Supports precalibrated input spans of 0 V to 2 V and 0 V to 10 V selected by pin strapping
• Includes a precision voltage reference programmable to 2.000 V or 10.000 V

Applications

• Process control systems requiring precise signal transmission
• Control of industrial valves and actuators
• Buffering output from current mode digital-to-analog converters

Procurement Notes

Verify the specific suffix JNZ against the manufacturer's latest datasheet to confirm package type and temperature grade. Confirm RoHS compliance status as manufacturing processes may change. Check for obsolescence notices or lifecycle status updates directly from Analog Devices before finalizing procurement plans.

Selection Notes

Select this component when a single-chip solution is required to convert voltage signals into a 4-20 mA loop current. Ensure the supply voltage falls within the 4.5 V to 36 V range. Consider the need for precalibrated spans versus external resistor programming for custom ranges. Verify that the SOIC-16 package fits the board layout constraints.

Part Context

The AD694 series serves as a dedicated interface between low-power sensors or DACs and industrial control loops. The JNZ variant typically denotes a specific package and temperature rating within the broader AD694 family. It simplifies design by integrating the transmitter, reference, and buffer into one unit, reducing external component count compared to discrete solutions.

Replacement Considerations

Direct replacements include other AD694 variants such as AD694ARZ or AD694BRZ, depending on the required operating temperature range and packaging preference. Verify pin compatibility and electrical specifications match the original design requirements before substitution.