Overview
The AD421BRZ, produced by Analog Devices Inc., is a high-performance, loop-powered 4 mA to 20 mA digital-to-analog converter (DAC). This component is designed for use in smart industrial control transmitters and is notable for its low cost and high accuracy. The AD421BRZ integrates a selectable voltage regulator, precision reference voltages, and a high-speed serial interface, making it a comprehensive solution for industrial control applications.
Key Specifications
| Parameter | Units | Conditions/Comments |
|---|---|---|
| Output Current Range | 4 mA to 20 mA | |
| Resolution | 16-bit | |
| Integral Nonlinearity | ±0.01% | |
| Full-Scale Settling Time | 8 ms typ | To ±0.1%, C1 = C2 = 10 nF, C3 = 3.3 nF |
| Output Impedance | 25 MΩ typ | |
| Voltage Regulator Output | +3 V, +3.3 V, +5 V | Pin selectable |
| Precision Reference Voltages | +1.25 V, +2.5 V | |
| Quiescent Current | 750 μA max | |
| Operating Temperature Range | –40°C to +85°C | |
| Package | 16-lead SOIC and PDIP |
Key Features
- HART® compatible and supports other FSK protocols.
- Programmable alarm current capability to indicate transducer faults.
- High-speed serial interface capable of operating at 10 Mbps.
- Selectable voltage regulator output: +3 V, +3.3 V, or +5 V.
- Precision reference voltages: +1.25 V and +2.5 V.
- Loop-powered operation with a minimum VCC + 2 V.
- Available in 16-lead SOIC and PDIP packages.
Applications
The AD421BRZ is primarily used in smart industrial control transmitters, particularly in applications requiring precise 4 mA to 20 mA current output. It is suitable for use in process control systems, industrial automation, and any environment where HART or similar FSK communication protocols are employed.
Q & A
- What is the primary function of the AD421BRZ?
The AD421BRZ is a loop-powered 4 mA to 20 mA digital-to-analog converter (DAC) designed for use in smart industrial control transmitters.
- What are the available voltage regulator output options for the AD421BRZ?
The voltage regulator output can be set to +3 V, +3.3 V, or +5 V, which is pin selectable.
- What is the resolution and integral nonlinearity of the AD421BRZ?
The AD421BRZ has a 16-bit resolution and an integral nonlinearity of ±0.01%.
- What is the full-scale settling time of the AD421BRZ?
The full-scale settling time is typically 8 ms to ±0.1%.
- Is the AD421BRZ compatible with HART protocols?
Yes, the AD421BRZ is fully compatible with standard HART circuitry and other similar FSK protocols.
- What are the precision reference voltages provided by the AD421BRZ?
The AD421BRZ provides precision reference voltages of +1.25 V and +2.5 V.
- What is the operating temperature range of the AD421BRZ?
The operating temperature range is –40°C to +85°C.
- In what packages is the AD421BRZ available?
The AD421BRZ is available in 16-lead SOIC and PDIP packages.
- Can the AD421BRZ be used with microprocessors and microcontrollers?
Yes, the high-speed serial interface of the AD421BRZ allows for simple connection to commonly used microprocessors and microcontrollers via a standard three-wire serial interface.
- What is the quiescent current of the AD421BRZ?
The quiescent current is a maximum of 750 μA.
