Overview
The AD421BRRL is a high-performance, loop-powered digital-to-analog converter (DAC) designed by Analog Devices Inc. This component is specifically tailored for smart industrial control transmitters, offering a cost-effective and integrated solution for generating 4 mA to 20 mA signals. The AD421BRRL is part of the AD421 series, known for its precision, reliability, and compatibility with standard HART circuitry and other similar FSK protocols.
Key Specifications
| Parameter | Min | Max | Unit | Conditions/Comments | |
|---|---|---|---|---|---|
| Current Loop Voltage Compliance | VCC + 2 V | 35 V | V | ||
| Full-Scale Settling Time | 8 ms | To ±0.1%, C1 = C2 = 10 nF, C3 = 3.3 nF | |||
| Output Impedance | 25 MΩ | Ω | |||
| AC Loop Voltage Sensitivity | 2 µA/V | µA/V | 1200 Hz to 2200 Hz | ||
| Voltage Regulator Output | 2.95/3.05 V | 3 V | V | 3 V Mode, LV Pin Connected to VCC | |
| Voltage Regulator Output | 3.25/3.35 V | 3.3 V | V | 3.3 V Mode, LV Pin Connected Through 0.01 µF to VCC | |
| Voltage Regulator Output | 4.95/5.05 V | 5 V | V | 5 V Mode | |
| Quiescent Current | 750 µA | µA | Max |
Key Features
- 4 mA to 20 mA Current Output: The AD421BRRL generates precise current signals for industrial control applications.
- HART Compatible: Fully compatible with standard HART circuitry and other similar FSK protocols.
- 16-Bit Resolution and Monotonicity: Ensures high precision and linearity in the output current.
- Precision References: Provides +1.25 V and +2.5 V precision reference voltages for other devices in the system.
- Programmable Alarm Current Capability: Allows the transmitter to send out-of-range currents to indicate a transducer fault.
- Flexible High Speed Serial Interface: Facilitates easy communication with microcontrollers.
- Loop-Powered Operation: Can operate from VCC + 2 V min to the breakdown voltage of the pass transistor.
- Compact Packaging: Available in 16-lead SOIC and PDIP packages.
Applications
The AD421BRRL is ideal for use in smart industrial control transmitters, particularly in applications requiring high precision and reliability. It is suitable for various industrial automation and control systems, including process control, instrumentation, and monitoring systems.
Q & A
- What is the primary function of the AD421BRRL?
The AD421BRRL is a loop-powered digital-to-analog converter designed to generate 4 mA to 20 mA signals for smart industrial control transmitters.
- Is the AD421BRRL compatible with HART protocol?
Yes, the AD421BRRL is fully compatible with standard HART circuitry and other similar FSK protocols.
- What is the resolution of the AD421BRRL?
The AD421BRRL has a 16-bit resolution and ensures monotonicity.
- What are the available voltage regulator output options for the AD421BRRL?
The AD421BRRL provides regulated output voltages of +3 V, +3.3 V, or +5 V.
- How does the AD421BRRL handle alarm conditions?
The AD421BRRL features a programmable alarm current capability to indicate transducer faults by sending out-of-range currents.
- What is the quiescent current of the AD421BRRL?
The quiescent current of the AD421BRRL is typically 750 µA maximum.
- What are the precision reference voltages provided by the AD421BRRL?
The AD421BRRL provides +1.25 V and +2.5 V precision reference voltages.
- What types of packages are available for the AD421BRRL?
The AD421BRRL is available in 16-lead SOIC and PDIP packages.
- Can the AD421BRRL be used in various industrial automation systems?
Yes, the AD421BRRL is suitable for various industrial automation and control systems, including process control and instrumentation.
- How does the AD421BRRL ensure high precision in its output?
The AD421BRRL ensures high precision through its 16-bit resolution and monotonicity, along with its precision references and regulated supply voltage.
