Part Number: AD694JNZ

Manufacturer: Analog Devices Inc.

Description: IC TRANSMITTER 4-20MA 16-DIP

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Technical Specifications of AD694JNZ

Datasheet  AD694JNZ datasheet
Category Integrated Circuits (ICs)
Family Interface – Sensor and Detector Interfaces
Manufacturer Analog Devices Inc.
Packaging Tube
Part Status Active
Type Current Transmitter
Input Type Voltage
Output Type Voltage
Current – Supply 23mA
Operating Temperature 0°C ~ 70°C
Mounting Type Through Hole
Package / Case 16-DIP (0.300″, 7.62mm)
Supplier Device Package 16-PDIP


The AD694JNZ is a flexible monolithic current transmitter that was made to make it easier to manage a wide range of process control devices. Its pin-programmable input ranges and high-level signal inputs make it ideal for use in current loop applications requiring both versatility and accuracy. This article will help you better understand how the AD694JNZ may improve your industrial operations by examining its most important features, uses, and benefits.

Understanding the AD694JNZ

What is the AD694JNZ?

The AD694JNZ can convert voltage to current all by itself. It accepts voltage signals and generates a current output of 4-20 mA. Because of this, it is crucial in systems that need precise current loop management, such as those used in process control.

Exploring the Impressive Features of AD694JNZ

With its exceptional combination of features, the AD694JNZ distinguishes out as a monolithic current transmitter. It is a crucial component in a wide variety of industrial uses due to its precise and flexible current management. In this piece, we’ll explore the advanced capabilities that set the AD694JNZ apart from the competition.

● Current Output Ranges

Both 4-20 mA and 0-20 mA current output ranges are available on the AD694JNZ. This flexibility allows that it may be easily included into a wide range of systems, supplying the appropriate amount of current for fine-grained regulation.

● Precalibrated Input Ranges

The AD694JNZ’s precalibrated input ranges are one of its most notable characteristics. It can accept signals from a wide range of sources, as its input ranges are both 0 V to 2 V and 0 V to 10 V. These factory-set parameters streamline setup and make it easy for the gadget to adjust to new conditions.

● Precision Voltage Reference

The AD694JNZ’s precision voltage reference can be set to either 2,000 V or 10,000 V, providing for extreme precision. This quality guarantees the device’s continued precision in signal conversion, which is essential for fine-grained command.

● Single or Dual Supply Operation

The AD694JNZ can run on either a single supply or two separate supplies. This flexibility in power supply topologies allows it to function in a wide range of system configurations and environments.

● Wide Power Supply Range

The device can operate with voltages between 4.5 V and 36 V. This wide operating voltage band assures compatibility with multiple power supplies, making it applicable in many commercial settings.

● Wide Output Compliance

The AD694JNZ’s wide output compliance is an important characteristic for working with a variety of controllers. The device’s flexible output voltage range ensures it will work with a large variety of parts.

● Input Buffer Amplifier

The device’s adaptability is enhanced by an incorporated input buffer amplifier. It can perform a variety of tasks, including as scaling the input voltage and buffering the output of a current-mode digital-to-analog converter (DAC). This extra versatility is useful for adapting the AD694JNZ to unique needs.

● Open-Loop Alarm

The open-loop alarm is one of the AD694JNZ’s most notable safety features. This feature serves as a warning mechanism, alerting users of open 4-20 mA loops or output stage noncompliance. This early warning system is invaluable for preventing future problems and ensuring control system reliability.

● Optional External Pass Transistor

The AD694JNZ can be used with an external pass transistor to reduce self-heating errors and broaden the temperature range of operation. This optional function is useful for fine-tuning and expanding the device’s capabilities.

● Low Nonlinearity

The AD694JNZ is precision-engineered, with a nonlinearity of 0.002% (typical). This level of precision means that the device produces consistent and trustworthy results, making it a good choice for applications requiring precision.

Finally, the AD694JNZ is a powerful and adaptable current transmitter with an amazing feature set. Its adaptability to a wide range of input ranges, precision voltage reference, variable power supply options, and enhanced safety features make it an excellent choice for industries that require accurate and dependable current management. The AD694JNZ shines as a key component for increasing industrial processes and assuring precision in control systems, whether in process control, factory automation, or system monitoring.

Functional Description and Application of the AD694JNZ

The AD694JNZ monolithic current transmitter is designed to simplify current control in a variety of applications. Let’s look at its functional description and see how it might be used in various scenarios.

Functional Components

● Buffer Amplifier

The AD694JNZ includes an input buffer amplifier that scales and buffers the input signal. This is useful for adjusting the device to diverse input voltage ranges and guaranteeing a stable signal for current output conversion.

● V/I Converter

The AD694JNZ’s primary function is voltage-to-current (V/I) conversion. It turns the input voltage into a precise current output, making it perfect for operating devices like valves, actuators, and other process control equipment.

● 4 mA Offset Generator

The device features a 4 mA offset generator, which allows you to switch the 4 mA zero current on and off with a TTL control pin, allowing you to produce a 0-20 mA operation and provide more freedom in regulating your systems.

● Voltage Reference

The AD694JNZ includes a precise voltage reference. It can be configured to 2.000 V or 10.000 V, guaranteeing that the device maintains high levels of signal conversion accuracy.

Applying the AD694JNZ

Now, let’s look at how to use the AD694JNZ in several situations:

Basic Interconnections: Single-Supply 12.5 V with Full-Scale 10 V

For a basic setup, let’s consider using a 12.5 V single supply and a 10 V full-scale input range. Here’s a straightforward connection:

  • Connect the input signal source to the input of the AD694JNZ.
  • Connect the AD694JNZ’s output to the device you want to control, such as a valve or actuator.
  • Apply a 12.5 V single supply to the AD694JNZ.

This configuration allows you to control the connected device using a 10 V full-scale input range.

Selecting a 2 V Full-Scale Input

If you need a 2 V full-scale input range, it’s a simple process:

  • Use pin strapping to select the 0 V to 2 V input range.
  • Connect your input signal within this range.
  • Adjust your system accordingly to accommodate this input range.

Selecting the 2 V Voltage Reference

To use the 2 V voltage reference for precise control:

  • Program the AD694JNZ to use the 2.000 V voltage reference.
  • This will ensure that the device operates with the specified voltage reference for accurate current output.

4.5 V Single-Supply Operation

For lower supply voltage applications:

  • Apply a 4.5 V single supply to the AD694JNZ.
  • Configure your input signal and control device to work within the constraints of this supply voltage.
  • This configuration is excellent for scenarios requiring lower power supply voltages.

Finally, the functional components of the AD694JNZ, which include the buffer amplifier, V/I converter, 4 mA offset generator, and voltage reference, provide a wide range of capabilities for current control in process automation and industrial applications. You may tailor the AD694JNZ to your unique requirements by selecting the proper input and voltage reference settings, as well as modifying the supply voltage, guaranteeing accurate and dependable current management for your systems.

Replacement for Discrete Designs

The AD694JNZ is a high-efficiency substitute for discrete designs in a variety of applications. Its consolidation of various functions into a single monolithic package minimizes complexity while increasing system reliability.

Temperature Range Options

To meet varied operating situations, the AD694JNZ is offered in a variety of temperature ranges, including the -40°C to +85°C industrial range and the 0°C to +70°C range.


The AD694JNZ is a versatile and high-precision monolithic current transmitter designed to simplify the task of controlling devices in the realm of process control. Its pin-programmable input ranges, output voltage compliance, alarm features, and integration capabilities make it a valuable component in a wide range of industrial applications. If you’re seeking accuracy and reliability in your industrial processes, the AD694JNZ is an excellent choice. Consider integrating it into your control systems to experience the benefits of a complete voltage-to-current transmitter that simplifies and enhances your processes.Contact us at ICRFQ, a top electrical components distributor in China, for more information and to order this great device, and we will ensure that you get an excellent product at an inexpensive price.

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