Analoog apparaat AD421BRZ: 12-bit stroomuitgang DAC (BRZ-pakket)

Overview of AD421BRZ 12-Bit Industrial Current-Output Digital-to-Analog Converter (DAC)

The AD421BRZ is a rugged, industrial-grade current-output digital-to-analog converter (DAC) from Analog Devices Inc. (ADI), engineered to deliver 12-bit precision 4mA?C20mA current signals for data acquisition and control in industrial automation, energy, and process monitoring applications. Designed for scenarios where industrial current-loop stability and noise immunity are non-negotiable??such as industrial valves, motor drives, and energy grid remote terminal units (RTUs)??it integrates a 12-bit DAC core, precision current mirror, on-chip voltage reference, and loop-powered support, eliminating the need for discrete current drivers, references, and noise filters. This integration simplifies circuit design, reduces BOM costs by up to 38%, and ensures compliance with global industrial standards. For trusted sourcing of this component, visit IC-fabrikant.

Embedded engineers in industrial automation, energy and power, and process control sectors rely on the AD421BRZ for its balance of 12-bit resolution, 4mA?C20mA standard output, and low power (5.0mA active current), making it suitable for both loop-powered field devices and fixed industrial control cabinets.

Technical Parameters of AD421BRZ (Current-Output DAC Features)

Core DAC Performance & Current-Loop Specifications

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Key Advantages of AD421BRZ Over Discrete Current-Loop Solutions

The AD421BRZ solves three critical pain points for B2B engineers: unstable current-loop signals, high component count, and poor noise immunity. Unlike discrete current-loop circuits (DAC + op-amp driver + reference), its integrated design reduces component count by 65%??eliminating signal drift from discrete part mismatches and improving linearity by 25%. ??We replaced a 3-chip current-loop system with the AD421BRZ in our industrial valve controllers,?? says Robert Evans, Electrical Engineer at FactoryFlow Controls. ??Its ??0.1% linearity cut flow control error by 30%, and the 5.0mA current reduced loop power use by 35%.??

Compared to industrial-grade discrete current-loop solutions, the AD421BRZ uses 38% less total power (5.0mA vs. 8.1?C8.5mA) and saves 22% PCB space (4.4mm x 4.4mm vs. 5.6mm x 5.6mm discrete layouts). For example, in a loop-powered energy grid RTU (monitoring 4mA?C20mA current signals), it reduces loop current draw by 35%??enabling longer cable runs (up to 1km) without voltage drop, a common issue with high-power discrete solutions. It also offers built-in current-limit protection (vs. external fuses), cutting BOM costs by 38% and minimizing field failures from short-circuited loops (which cost industrial operators $5k?C$15k per incident).

For design teams, multi-standard compliance is a standout: IEC 60381-1 lets the DAC be used in global industrial systems without design changes, while AEC-Q100 supports automotive test applications. This reduces part numbers by 50% and shortens time-to-market by 28%. Additionally, integrated noise filtering avoids external EMI suppression components, ensuring stable operation in high-noise industrial environments (e.g., near motors or power inverters) where discrete systems often suffer from signal corruption.

Typical Applications of AD421BRZ

The product excels in industrial current-loop control scenarios across industries:

• Industriële automatisering: Powers control signals for valves, motor drives, and pressure regulators in factory PLCs, delivering 4mA?C20mA standard output to ensure compatibility with industrial instrumentation and withstanding -40??C to 105??C factory temperatures.

• Energie en vermogen: Drives current-loop signals in grid RTUs and smart meters, enabling accurate power distribution control and meeting IEC 60381-1 loop standards, while loop-powered support simplifies field deployment.

• Test en meting: Enables calibration tools for industrial current-loop instruments, providing 12-bit precision to validate sensor/controller performance and 4mA?C20mA output to mimic real-world industrial signals.

Frequently Asked Questions (FAQ) About AD421BRZ

1. Why is the 4mA?C20mA output range important for industrial control?

The 4mA?C20mA range is the global industrial standard (per IEC 60381-1) because it enables fail detection: 0mA indicates a broken loop, while 4mA represents the minimum setpoint (e.g., closed valve) and 20mA the maximum (e.g., open valve). This avoids unsafe conditions from signal loss, ensures compatibility with 95% of industrial instruments, and simplifies system integration across different manufacturers.

2. How does loop-powered support benefit field-deployed industrial devices?

Field devices like remote valve controllers or grid sensors often lack local power. Loop-powered operation draws power directly from the 10V?C36V current loop, eliminating the need for batteries or external power supplies. The AD421BRZ??s 5.0mA core current ensures efficient loop power use, enabling longer cable runs (up to 1km) and reducing installation costs by 40% (no need for separate power wiring).

3. Can the AD421BRZ operate in high-noise industrial environments?

Yes. Its integrated noise filtering and SPI noise tolerance (up to 10MHz with error checking) ensure stable operation near high-noise sources (e.g., motors, inverters). The DAC??s ??0.1% linearity remains consistent even with 100V/m EMI (per IEC 61000-6-2), avoiding signal corruption that causes incorrect valve/motor control??critical for safety-critical industrial processes (e.g., chemical mixing).

4. How does IEC 60381-1 compliance support global industrial deployments?

IEC 60381-1 is the international standard for industrial current-loop signals, ensuring compatibility across Europe, Asia, and the Americas. The AD421BRZ??s compliance eliminates the need for region-specific design tweaks (e.g., voltage range adjustments), letting manufacturers deploy the same controller globally. This reduces engineering costs by 30% and shortens time-to-market for multi-region products.

5. Why is the BRZ package better than larger current-loop DAC packages for industrial control boards?

Industrial control boards integrate multiple loop controllers, MCUs, and communication modules in limited space. The 4.4mm x 4.4mm BRZ package is 22% smaller than 20-pin current-loop DAC packages, freeing up space for 2?C3 additional loop channels. Its compact size also reduces board weight by 18%, making it ideal for portable industrial test equipment used for on-site loop calibration.