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The AD694JN by Analog Devices, Inc. is a complete, monolithic, signal conditioned, high voltage, loop-powered 4-20mA transmitter. It provides a 4-20mA output proportional to a high-level DC voltage input, making it suitable for a wide range of industrial applications. Functions: 1. Signal Conditioning: The AD694JN conditions and translates high-level DC voltage inputs into a 4-20mA current output signal. 2. Loop-Powered: It operates using power supplied by the 4-20mA current loop itself, eliminating the need for an external power supply. 3. High Voltage Operation: The AD694JN accepts input voltages up to ±40V, allowing for flexible voltage range measurements. Applications: 1. Industrial Process Control: The AD694JN can be used in various process control applications, such as monitoring and transmitting signals from temperature, pressure, and level sensors. 2. Condition Monitoring: It can also be employed in condition monitoring systems to convert sensor readings into an industry-standard current output, suitable for use with PLCs and DCSs. 3. Power Monitoring: The AD694JN is applicable for measuring and transmitting high voltage signals related to power monitoring and control in industrial environments. Alternative Parts: 1. Texas Instruments XTR117: Similar to the AD694JN, it also provides a 4-20mA current output but offers additional features like integrated temperature sensing and improved accuracy. 2. Maxim Integrated MAX4209: This alternative IC is designed for precision current-sensing applications, offering precise 4-20mA current outputs and high common-mode voltage handling capabilities. Embedded Modules: 1. Pepperl+Fuchs KFD2-UT2-Ex1: This module integrates the AD694JN and provides intrinsically safe signal conditioning, suitable for hazardous area applications. 2. Moore Industries THZ5: It is an embedded transmitter module that incorporates the AD694JN, offering features like HART protocol, digital communication, and exceptional accuracy. Q&A: 1. Q: Can the AD694JN operate as a stand-alone device? A: No, the AD694JN requires an external power supply provided by the 4-20mA current loop itself. 2. Q: What is the output resolution of the AD694JN? A: The AD694JN provides a continuous analog output with a resolution determined by the resolution of the input voltage. 3. Q: What is the maximum loop resistance for reliable operation? A: The AD694JN is designed to operate with loop resistances up to 750Ω for proper 4-20mA current loop functionality. 4. Q: Can the AD694JN be used in hazardous environments? A: No, the AD694JN by itself is not intrinsically safe. It requires additional safety measures when used in hazardous areas. 5. Q: Is the AD694JN suitable for high voltage measurements? A: Yes, the AD694JN accepts input voltages up to ±40V, allowing for high voltage measurements in various applications.