AD694BRZ-REEL

Overview

The AD694BRZ-REEL is a current transmitter integrated circuit manufactured by Analog Devices Inc., designed for converting voltage inputs into standardized current outputs. It operates within a supply voltage range of 4.5 V to 36 V and consumes 1.5 mA of operating power. The device features a single channel with a buffer input type, delivering up to 20 mA per channel output. Key electrical specifications include an input bias current of 5 nA, an input offset voltage of 50 uV, and a common-mode rejection ratio of 80 dB. It utilizes a 16-SOIC surface-mount package and functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Integrates instrumentation amplifier functionality with loop transmission capabilities in a single monolithic component.
• Provides high common-mode rejection to ensure accurate signal processing in noisy industrial environments.
• Supports direct connection of low-level sensor signals due to low input bias current and offset voltage characteristics.

Applications

• Industrial process control systems requiring 4-20mA loop transmission.
• Sensor interface circuits for pressure, temperature, or strain gauge measurements.
• Smart transmitter modules for remote monitoring applications.

Procurement Notes

Verify the specific suffix designation when sourcing, as packaging variations such as REEL or REEL7 may exist. Confirm availability status directly with authorized distributors, as this component has been reported as discontinued or restricted in certain regions. Ensure compliance with RoHS3 standards and check for any recent Product Change Notices regarding manufacturing site updates before finalizing procurement plans.

Selection Notes

Select this component when a combined instrumentation amplifier and current loop transmitter is required to minimize board space and component count. Consider the 16-SOIC package constraints for thermal management and PCB layout. Evaluate the 4.5 V minimum supply requirement against system power budgets. Verify that the 20 mA output capability aligns with downstream receiver input ranges and loop impedance calculations.

Part Context

The AD694 belongs to a family of precision analog front-end devices from Analog Devices, specifically engineered for industrial automation and instrumentation. It serves as a specialized solution for isolating and transmitting sensor data over long distances using standard current loops. The BRZ variant indicates a lead-free, halogen-free compliant version housed in a standard SOIC package, fitting within the broader portfolio of signal conditioning ICs used in critical measurement infrastructure.

Replacement Considerations

Public sources indicate the AD694BRZ-REEL is discontinued or restricted. Potential functional equivalents should be sought among other Analog Devices current transmitters or general-purpose instrumentation amplifiers configured for loop driving. Verify pin compatibility and electrical parameter alignment, particularly supply voltage range and output current limits, before substituting.