Overview
The AD694BRZ-REEL, produced by Analog Devices Inc., is a monolithic current transmitter designed to drive a standard 4–20 mA current loop. This component is ideal for controlling valves, actuators, and other devices commonly used in process control. It accepts high-level signal inputs and features an input buffer amplifier that can scale the input signal or buffer the output from a current mode DAC. The AD694BRZ-REEL is known for its precision voltage reference, wide power supply range, and high accuracy, making it a reliable choice for industrial process control, factory automation, and system monitoring applications.
Key Specifications
| Parameter | Min | Typ | Max |
|---|---|---|---|
| Supply Voltage | 4.5 V | 36 V | |
| Operating Temperature | -40°C | 85°C | |
| No. of Pins | 16 | ||
| Package Type | WSOIC | ||
| Slew Rate | 1.3 mA/μs | ||
| Output Current Range | 4 mA | 20 mA | |
| Output Voltage Compliance | VS - 2 V | ||
| Input Voltage Range | 0 V to 2 V, 0 V to 10 V | ||
| Input Bias Current | 1.5 nA | 51 nA | |
| Output Impedance | 40 Ω | 50 Ω |
Key Features
- Precalibrated input ranges: 0 V to 2 V and 0 V to 10 V, with the option to program other spans using external resistors.
- Precision voltage reference programmable to 2.000 V or 10.000 V.
- Single or dual supply operation with a wide power supply range from 4.5 V to 36 V.
- Wide output compliance extending to within 2 V of the positive supply and below common in dual supply operation.
- Input buffer amplifier for scaling the input signal or buffering the output from a current mode DAC.
- Open-loop alarm for detecting open 4–20 mA loop or noncompliance of the output stage.
- Optional external pass transistor to reduce self-heating errors and extend the temperature range of operation.
Applications
The AD694BRZ-REEL is widely used in various applications including industrial process control, factory automation, and system monitoring. It is particularly suited for controlling valves, actuators, and other devices that require precise 4–20 mA signal transmission. Additionally, it can be used for transmitting process parameters such as pressure, temperature, or flow.
Q & A
- What is the primary function of the AD694BRZ-REEL? The AD694BRZ-REEL is a monolithic current transmitter that drives a standard 4–20 mA current loop for controlling valves, actuators, and other devices in process control.
- What are the precalibrated input ranges of the AD694BRZ-REEL? The precalibrated input ranges are 0 V to 2 V and 0 V to 10 V.
- What is the power supply range of the AD694BRZ-REEL? The power supply range is from 4.5 V to 36 V.
- Can the AD694BRZ-REEL operate with both single and dual supplies? Yes, it supports both single and dual supply operations.
- What is the purpose of the input buffer amplifier? The input buffer amplifier can be used to scale the input signal or buffer the output from a current mode DAC.
- How does the open-loop alarm function? The open-loop alarm warns of an open 4–20 mA loop or noncompliance of the output stage.
- Can the AD694BRZ-REEL be used with an external pass transistor? Yes, an external pass transistor can be used to reduce self-heating errors and extend the temperature range of operation.
- What is the operating temperature range of the AD694BRZ-REEL? The operating temperature range is from -40°C to 85°C.
- What package types are available for the AD694BRZ-REEL? It is available in 16-pin SOIC and other packages such as CERDIP and plastic DIP.
- Is the AD694BRZ-REEL RoHS compliant? Yes, it is RoHS compliant.
