AD694JR

Overview

The AD694JR is a monolithic current transmitter manufactured by Analog Devices Inc., designed to drive standard 4–20 mA current loops for process control applications. It accepts high-level signal inputs, which are buffered and scaled by an internal input amplifier. The device supports precalibrated input spans of 0 V to 2 V or 0 V to 10 V via pin strapping, with other ranges programmable using external resistors. Key electrical parameters include a maximum power supply voltage of 36 V, a minimum operating voltage of 4.5 V, and a typical nonlinearity of 0.002%. It operates within a temperature range of -40°C to +85°C and is housed in a 16-SOIC surface-mount package.

Feature Summary

• Accepts high-level voltage signals to drive standard 4-20 mA current loops for controlling valves and actuators
• Features a buffered input amplifier capable of scaling input signals or buffering current mode DAC outputs
• Supports simple pin-strapped selection of precalibrated 0 V to 2 V or 0 V to 10 V input spans

Applications

• Process control systems requiring precise signal transmission
• Driving industrial valves and actuators via current loops
• Buffering output from current mode digital-to-analog converters (DACs)

Procurement Notes

Verify the specific suffix 'JR' against official Analog Devices documentation to confirm it denotes the SOIC-16 package variant. Confirm availability status as distribution channels may list this part as limited supply or obsolete. Ensure the selected component matches the required temperature grade and packaging format for the target assembly process.

Selection Notes

Select the AD694JR when a surface-mount solution is required for 4-20 mA loop transmission. Compare input span requirements against the precalibrated 0-2 V and 0-10 V options; use external resistors if other ranges are needed. Verify that the 36 V maximum supply voltage and compliance requirements align with the system's power infrastructure and load constraints.

Part Context

The AD694 series comprises monolithic current transmitters intended for industrial process control. The AD694JR specifically refers to the version packaged in a 16-lead Small Outline Integrated Circuit (SOIC) body. This family allows for direct interfacing with sensors and DACs, simplifying the design of analog signal conditioning circuits for remote monitoring and control tasks.

Replacement Considerations

Publicly confirmed substitute part numbers for the AD694JR are not available in the provided reference data. Evaluate alternative current transmitters from Analog Devices or other manufacturers only after verifying pin compatibility, electrical specifications, and package dimensions.