AD694BRZ-REEL7

Overview

The AD694BRZ-REEL7 is a current transmitter integrated circuit manufactured by Analog Devices Inc., housed in a 16-SOIC surface-mount package. It functions as an instrumentation amplifier configured for loop transmission, accepting voltage inputs and producing a 20 mA output current per channel. Key electrical specifications include a maximum supply voltage of 36 V, a minimum operating voltage of 4.5 V, and a typical supply current of 1.5 mA. The device offers a gain-bandwidth product of 300 kHz, a common-mode rejection ratio (CMRR) of 80 dB, and a power supply rejection ratio (PSRR) of 80 dB. Input characteristics feature a bias current of 5 nA, offset voltage of 50 uV, and input resistance up to 5 MOhms. It operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated instrumentation amplifier architecture designed specifically for industrial current loop transmission applications
• High common-mode rejection and power supply rejection capabilities to ensure signal integrity in noisy environments
• Buffered voltage input interface allowing direct connection to various sensor types without additional conditioning

Applications

• Industrial process control systems requiring 4-20mA loop transmission
• Sensor signal conditioning for pressure, temperature, or flow measurement devices
• Data acquisition systems interfacing analog sensors with digital controllers

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels due to limited availability status. Confirm the specific reel packaging variant matches design requirements. Check for recent production change notices regarding wafer fabrication sites. Ensure compliance with RoHS3 standards if required by project specifications. Validate lead times as supply constraints may affect delivery schedules.

Selection Notes

Select this component when a monolithic solution for voltage-to-current conversion is needed in a compact SOIC-16 package. Consider the 36 V maximum supply limit and 1.5 mA quiescent current against system power budgets. Evaluate the 80 dB CMRR requirement against environmental noise levels. Compare input bias and offset specifications against sensor accuracy requirements. Verify thermal performance within the -40°C to +85°C operational range.

Part Context

The AD694 series represents Analog Devices' dedicated line of current transmitter ICs. The BRZ suffix indicates a commercial temperature grade (-40°C to +85°C) and RoHS-compliant packaging. The REEL7 designation specifies tape-and-reel packaging for automated assembly. This part integrates amplifier and driver stages into a single chip, reducing board space compared to discrete solutions.

Replacement Considerations

The AD694BRZ tube version serves as a direct pin-compatible alternative with identical electrical characteristics but different packaging. Other AD694 variants may offer extended temperature ranges or different package styles. Verify pinout compatibility and parameter equivalence before substitution.